BlackRock (BLK) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'BLK	'
Entity Registrant Name	'BlackRock Inc.	'
Entity Central Index Key	'0001364742	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	165,213,996

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Financial Condition (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets	'	'
Cash and cash equivalents	$6,149	$4,390
Accounts receivable	2,631	2,247
Investments	1,951	2,151
Separate account assets	156,479	155,113
Separate account collateral held under securities lending agreements	20,966	21,788
Property and equipment (net of accumulated depreciation of $680 and $611 at September 30, 2014 and December 31, 2013, respectively)	468	525
Intangible assets (net of accumulated amortization of $1,176 and $1,057 at September 30, 2014 and December 31, 2013, respectively)	17,378	17,501
Goodwill	12,966	12,980
Other assets	766	692
Total assets	222,812	219,873
Liabilities	'	'
Accrued compensation and benefits	1,487	1,747
Accounts payable and accrued liabilities	1,576	1,084
Borrowings	5,937	4,939
Separate account liabilities	156,479	155,113
Separate account collateral liabilities under securities lending agreements	20,966	21,788
Deferred income tax liabilities	5,056	5,085
Other liabilities	971	1,004
Total liabilities	195,528	193,203
Commitments and contingencies (Note 12)	'	'
Temporary equity	'	'
Redeemable noncontrolling interests	49	54
Permanent Equity	'	'
Common stock, $0.01 par value; Shares authorized: 500,000,000 at September 30, 2014 and December 31, 2013; Shares issued: 171,252,185 at September, 30, 2014 and December 31, 2013; Shares outstanding: 165,475,182 and 166,589,688 at September 30, 2014 and December 31, 2013, respectively	2	2
Preferred stock (Note 16)	0	0
Additional paid-in capital	19,270	19,473
Retained earnings	9,673	8,208
Accumulated other comprehensive loss	-169	-35
Treasury stock, common, at cost (5,777,003 and 4,662,497 shares held at September 30, 2014 and December 31, 2013, respectively)	-1,657	-1,210
Total BlackRock, Inc. stockholders' equity	27,106	26,460
Nonredeemable noncontrolling interests	114	135
Total permanent equity	27,235	26,616
Total liabilities, temporary equity and permanent equity	222,812	219,873
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Assets	'	'
Cash and cash equivalents	175	161
Bank loans, other investments and other assets	2,883	2,325
Liabilities	'	'
Borrowings	2,889	2,369
Other liabilities	167	74
Permanent Equity	'	'
Appropriated retained earnings	-13	22
Nonredeemable noncontrolling interests	$15	$21

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Property and equipment, accumulated depreciation	$680	$611
Intangible assets, accumulated amortization	$1,176	$1,057
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	171,252,185	171,252,185
Common stock, shares outstanding	165,475,182	166,589,688
Treasury stock, common shares	5,777,003	4,662,497

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	'	'	'	'
Total investment advisory, administration fees and securities lending revenue	$2,468	$2,153	$7,193	$6,459
Investment advisory performance fees	133	96	406	293
BlackRock Solutions and advisory	165	156	465	420
Distribution fees	17	19	54	54
Other revenue	66	48	179	177
Total revenue	2,849	2,472	8,297	7,403
Expense	'	'	'	'
Employee compensation and benefits	973	866	2,903	2,635
Distribution and servicing costs	90	85	268	266
Amortization of deferred sales commissions	14	14	43	38
Direct fund expense	199	167	565	490
General and administration	376	334	1,066	1,130
Amortization of intangible assets	40	40	122	120
Total expense	1,692	1,506	4,967	4,679
Operating income	1,157	966	3,330	2,724
Nonoperating income (expense)	'	'	'	'
Net gain (loss) on investments	46	32	167	235
Interest and dividend income	10	8	23	18
Interest expense	-61	-52	-174	-159
Total nonoperating income (expense)	-52	-18	-19	92
Income before income taxes	1,105	948	3,311	2,816
Income tax expense	232	219	853	715
Net income	873	729	2,458	2,101
Less:	'	'	'	'
Net income (loss) attributable to redeemable noncontrolling interests	0	0	2	-1
Net income (loss) attributable to nonredeemable noncontrolling interests	-44	-1	-25	11
Net income attributable to BlackRock, Inc.	917	730	2,481	2,091
Earnings per share attributable to BlackRock, Inc. common stockholders:	'	'	'	'
Basic	$5.46	$4.30	$14.72	$12.26
Diluted	$5.37	$4.21	$14.48	$12.02
Cash dividends declared and paid per share	$1.93	$1.68	$5.79	$5.04
Weighted-average common shares outstanding:	'	'	'	'
Basic	167,933,040	169,811,633	168,571,354	170,581,930
Diluted	170,778,766	173,371,508	171,351,276	174,012,876
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'	'	'
Nonoperating income (expense)	'	'	'	'
Net gain (loss) on consolidated variable interest entities	-47	-6	-35	-2
Related Parties [Member]	'	'	'	'
Revenue	'	'	'	'
Total investment advisory, administration fees and securities lending revenue	1,744	1,478	5,044	4,403
Other Third Parties [Member]	'	'	'	'
Revenue	'	'	'	'
Total investment advisory, administration fees and securities lending revenue	$724	$675	$2,149	$2,056

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'		'		'		'
Net income	$873		$729		$2,458		$2,101
Other comprehensive income:	'		'		'		'
Unrealized holding gains (losses), net of tax	-1	[1]	2	[1]	3	[1]	3	[1]
Less: reclassification adjustment included in net income	2	[1]	1	[1]	8	[1]	10	[1]
Net change from available-for-sale investments, net of tax	-3		1		-5		-7
Foreign currency translation adjustments	-167		118		-129		-13
Other comprehensive income (loss)	-170		119		-134		-20
Comprehensive income	703		848		2,324		2,081
Less: Comprehensive income (loss) attributable to noncontrolling interests	-44		-1		-23		10
Comprehensive income attributable to BlackRock, Inc.	$747		$849		$2,347		$2,071
[1]	The tax benefit (expense) was not material for the three and nine months ended September 30, 2014 and 2013.

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Changes in Equity (USD $)	Total	Additional Paid-in Capital [Member]		Retained Earnings [Member]	Appropriated Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock Common [Member]	Total Stockholders' Equity [Member]	Nonredeemable Noncontrolling Interests [Member]	Nonredeemable Noncontrolling Interests of Consolidated VIEs [Member]	Redeemable Noncontrolling Interests / Temporary Equity [Member]
In Millions
Balance at Dec. 31, 2012	$25,585	$19,421	[1]	$6,444	$29	($59)	($432)	$25,403	$155	$27	$32
Net income	2,102	'		2,091	'	'	'	2,091	13	-2	-1
Allocation of gains (losses) of consolidated collateralized loan obligations	'	'		'	-4	'	'	-4	'	4	'
Dividends paid	-882	'		-882	'	'	'	-882	'	'	'
Stock-based compensation	340	339	[1]	'	'	'	1	340	'	'	'
Issuance of common shares related to employee stock transactions	20	-402	[1]	'	'	'	422	20	'	'	'
Employee tax withholdings related to employee stock transactions	-234	'		'	'	'	-234	-234	'	'	'
Shares repurchased	-750	'		'	'	'	-750	-750	'	'	'
Net tax benefit (shortfall) from stock-based compensation	35	35	[1]	'	'	'	'	35	'	'	'
Subscriptions (redemptions/distributions)-noncontrolling interest holders	83	'		'	'	'	'	'	-41	124	104
Net consolidations (deconsolidations) of sponsored investment funds	-134	'		'	'	'	'	'	'	-134	-94
Other comprehensive income (loss)	-20	'		'	'	-20	'	-20	'	'	'
Balance at Sep. 30, 2013	26,145	19,393	[1]	7,653	25	-79	-993	25,999	127	19	41
Balance at Dec. 31, 2013	26,616	19,475	[2]	8,208	22	-35	-1,210	26,460	135	21	54
Net income	2,456	0	[2]	2,481	0	0	0	2,481	10	-35	2
Allocation of gains (losses) of consolidated collateralized loan obligations	0	0	[2]	0	-35	0	0	-35	0	35	0
Dividends paid	-1,016	0	[2]	-1,016	0	0	0	-1,016	0	0	0
Stock-based compensation	336	336	[2]	0	0	0	0	336	0	0	0
Issuance of common shares related to employee stock transactions	9	-632	[2]	0	0	0	641	9	0	0	0
Employee tax withholdings related to employee stock transactions	-338	0	[2]	0	0	0	-338	-338	0	0	0
Shares repurchased	-750	0	[2]	0	0	0	-750	-750	0	0	0
Net tax benefit (shortfall) from stock-based compensation	93	93	[2]	0	0	0	0	93	0	0	0
Subscriptions (redemptions/distributions)-noncontrolling interest holders	-37	0	[2]	0	0	0	0	0	-31	-6	247
Net consolidations (deconsolidations) of sponsored investment funds	0	0	[2]	0	0	0	0	0	0	0	-254
Other comprehensive income (loss)	-134	0	[2]	0	0	-134	0	-134	0	0	0
Balance at Sep. 30, 2014	$27,235	$19,272	[2]	$9,673	($13)	($169)	($1,657)	$27,106	$114	$15	$49
[1]	Amounts include $2 million of common stock at both September 30, 2013 and December 31, 2012.
[2]	Amounts include $2 million of common stock at both September 30, 2014 and December 31, 2013.

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Changes in Equity (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Statement of Stockholders' Equity [Abstract]	'	'	'	'
Additional Paid-in Capital, value of stock	$2	$2	$2	$2

Condensed_Consolidated_Stateme6

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities	'	'
Net income	$2,458	$2,101
Adjustments to reconcile net income to cash flows from operating activities:	'	'
Depreciation and amortization	215	215
Amortization of deferred sales commissions	43	38
Stock-based compensation	336	340
Deferred income tax expense (benefit)	-31	-44
Net (gains) losses on nontrading investments	-53	-46
Purchases of investments within consolidated sponsored investment funds	-151	-45
Proceeds from sales and maturities of investments within consolidated sponsored investment funds	113	112
Gain related to PennyMac initial public offering	0	-39
Gain related to the charitable contribution	0	-80
Charitable contribution	0	124
Assets and liabilities of consolidated VIEs:	'	'
Change in cash and cash equivalents	10	204
Net (gains) losses within consolidated VIEs	35	2
Net (purchases) proceeds and distributions within consolidated VIEs	-540	15
(Earnings) losses from equity method investees	-133	-110
Distributions of earnings from equity method investees	44	39
Other adjustments	7	'
Changes in operating assets and liabilities:	'	'
Accounts receivable	-426	-2,061
Investments, trading	-189	-205
Other assets	-139	-139
Accrued compensation and benefits	-272	-225
Accounts payable and accrued liabilities	473	2,264
Other liabilities	10	16
Cash flows from operating activities	1,810	2,476
Cash flows from investing activities	'	'
Purchases of investments	-304	-188
Proceeds from sales and maturities of investments	504	225
Distributions of capital from equity method investees	130	51
Net consolidations (deconsolidations) of sponsored investment funds	-33	-63
Acquisitions, net of cash acquired	0	-240
Purchases of property and equipment	-40	-60
Cash flows from investing activities	257	-275
Cash flows from financing activities	'	'
Repayments of short-term borrowings	0	-100
Repayments of long-term borrowings	0	-750
Proceeds from long-term borrowings	997	'
Cash dividends paid	-1,016	-882
Repurchases of common stock	-1,088	-984
Net proceeds from (repayments of) borrowings by consolidated VIEs	536	-343
Net (redemptions/distributions paid) / subscriptions received from noncontrolling interests holders	210	187
Excess tax benefit from stock-based compensation	93	40
Other financing activities	5	20
Cash flows from financing activities	-263	-2,812
Effect of exchange rate changes on cash and cash equivalents	-45	-8
Net increase (decrease) in cash and cash equivalents	1,759	-619
Cash and cash equivalents, beginning of period	4,390	4,606
Cash and cash equivalents, end of period	6,149	3,987
Supplemental disclosure of cash flow information:	'	'
Interest	140	125
Interest on borrowings of consolidated VIEs	112	82
Income taxes	992	746
Supplemental schedule of noncash investing and financing transactions:	'	'
Issuance of common stock	632	402
Increase (decrease) in noncontrolling interests due to net consolidation (deconsolidation) of sponsored investment funds	($254)	($228)

Business_Overview

Business Overview	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Business Overview	'
	1.  Business Overview
	BlackRock, Inc. (together, with its subsidiaries, unless the context otherwise indicates, “BlackRock” or the “Company”) is a leading publicly traded investment management firm providing a broad range of investment and risk management services to institutional and retail clients worldwide.
	BlackRock’s diverse platform of active (alpha) and index (beta) investment strategies across asset classes enables the Company to tailor investment outcomes and asset allocation solutions for clients. Product offerings include single- and multi-asset class portfolios investing in equities, fixed income, alternatives and money market instruments. Products are offered directly and through intermediaries in a variety of vehicles, including open-end and closed-end mutual funds, iShares® exchange-traded funds (“ETFs”), separate accounts, collective investment funds and other pooled investment vehicles. BlackRock also offers the BlackRock Solutions® investment and risk management technology platform, Aladdin®, risk analytics and advisory services and solutions to a broad base of institutional investors.
	At September 30, 2014, The PNC Financial Services Group, Inc. (“PNC”) held 21.0% of the Company’s voting common stock and 22.0% of the Company’s capital stock, which includes outstanding common and nonvoting preferred stock.

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	2.  Significant Accounting Policies
	Basis of Presentation.    These condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and include the accounts of the Company and its controlled subsidiaries. Noncontrolling interests on the condensed consolidated statements of financial condition represents the portion of consolidated sponsored investment funds in which the Company does not have direct equity ownership. Accounts and transactions between consolidated entities have been eliminated.
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting periods. Actual results could differ from those estimates.
	Certain financial information that is normally included in annual financial statements, including certain financial statement footnotes, is not required for interim reporting purposes and has been condensed or omitted herein. These condensed consolidated financial statements should be read in conjunction with the Company’s consolidated financial statements and notes related thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission (“SEC”) on February 28, 2014 (“2013 Form 10-K”).
	The interim financial information at September 30, 2014 and for the three and nine months ended September 30, 2014 and 2013 is unaudited. However, in the opinion of management, the interim information includes all normal recurring adjustments necessary for the fair presentation of the Company’s results for the periods presented. The results of operations for interim periods are not necessarily indicative of results to be expected for the full year.
	Fair Value Measurements.
	Hierarchy of Fair Value Inputs.    The provisions of Accounting Standards Codification (“ASC”) 820, Fair Value Measurement (“ASC 820”), establish a hierarchy that prioritizes inputs to valuation techniques used to measure fair value and require companies to disclose the fair value of their financial instruments according to the fair value hierarchy (i.e., Level 1, 2 and 3 inputs, as defined). The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.
	Assets and liabilities measured and reported at fair value are classified and disclosed in one of the following categories:
	Level 1 Inputs:
	Quoted prices (unadjusted) in active markets for identical assets or liabilities at the reporting date.
		•	Level 1 assets may include listed mutual funds (including those accounted for under the equity method of accounting as these mutual funds are investment companies that have publicly available net asset values (“NAVs”), which in accordance with GAAP, are calculated under fair value measures and the changes in fair values are equal to the earnings of such funds), ETFs, listed equities and certain exchange-traded derivatives.
	Level 2 Inputs:
	Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities that are not active; quotes from pricing services or brokers for which the Company can determine that orderly transactions took place at the quoted price or that the inputs used to arrive at the price are observable; and inputs other than quoted prices that are observable, such as models or other valuation methodologies. As a practical expedient, the Company uses the NAV (or its equivalent) of certain investments as their fair value.
		•	Level 2 assets may include debt securities, bank loans, short-term floating-rate notes, asset-backed securities, securities held within consolidated hedge funds, certain equity method limited partnership interests in hedge funds valued based on NAV (or its equivalent) where the Company has the ability to redeem at the measurement date or within the near term without redemption restrictions, restricted public securities valued at a discount, as well as over-the-counter derivatives, including interest and inflation rate swaps and foreign currency exchange contracts that have inputs to the valuations that generally can be corroborated by observable market data.
	Level 3 Inputs:
	Unobservable inputs for the valuation of the asset or liability, which may include nonbinding broker quotes. Level 3 assets include investments for which there is little, if any, market activity. These inputs require significant management judgment or estimation. Certain investments that are valued using a NAV (or its equivalent) and are subject to current redemption restrictions that will not be lifted in the near term are included in Level 3.
		•	Level 3 assets may include general and limited partnership interests in private equity funds, funds of private equity funds, real estate funds, hedge funds, funds of hedge funds, direct private equity investments held within consolidated funds, bank loans and bonds.
		•	Level 3 liabilities include borrowings of consolidated collateralized loan obligations (“CLOs”) valued based upon nonbinding single-broker quotes.
		•	Level 3 inputs include BlackRock capital accounts for its partnership interests in various alternative investments, including distressed credit hedge funds, opportunistic funds, real estate and private equity funds, which may be adjusted by using the returns of certain market indices.
	Significance of Inputs.    The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the financial instrument.
	Valuation Techniques. The fair values of certain Level 3 assets and liabilities were determined using various methodologies as appropriate, including NAVs of underlying investments, third-party pricing vendors, broker quotes and market and income approaches. Such quotes and modeled prices are evaluated for reasonableness through various procedures, including due diligence reviews of third-party pricing vendors, variance analyses, consideration of the current market environment and other analytical procedures.
	As a practical expedient, the Company uses NAV as the fair value for certain investments. The inputs to value these investments may include BlackRock capital accounts for its partnership interests in various alternative investments, including distressed credit hedge funds, opportunistic funds, real estate and private equity funds, which may be adjusted by using the returns of certain market indices. The various partnerships generally are investment companies, which record their underlying investments at fair value based on fair value policies established by management of the underlying fund. Fair value policies at the underlying fund generally require the fund to utilize pricing/valuation information from third-party sources, including independent appraisals. However, in some instances, current valuation information for illiquid securities or securities in markets that are not active may not be available from any third-party source or fund management may conclude that the valuations that are available from third-party sources are not reliable. In these instances, fund management may perform model-based analytical valuations that may be used as an input to value these investments.
	A significant number of inputs used to value equity, debt securities and bank loans is sourced from third-party pricing vendors. Generally, prices obtained from pricing vendors are categorized as Level 1 inputs for identical securities traded in active markets and as Level 2 for other similar securities if the vendor uses observable inputs in determining the price. Annually, BlackRock’s internal valuation committee or other designated groups review both the valuation methodologies, including the general assumptions and methods used to value various asset classes, and operational processes with these vendors. On a quarterly basis, meetings are held with key vendors to identify any significant changes to the vendors’ processes.
	In addition, quotes obtained from brokers generally are nonbinding and categorized as Level 3 inputs. However, if the Company is able to determine that market participants have transacted for the asset in an orderly manner near the quoted price or if the Company can determine that the inputs used by the broker are observable, the quote is classified as a Level 2 input.
	Fair Value Option.    ASC 825-10, Financial Instruments (“ASC 825-10”), provides a fair value option election that allows companies an irrevocable election to use fair value as the initial and subsequent accounting measurement attribute for certain financial assets and liabilities. ASC 825-10 permits entities to elect to measure eligible financial assets and liabilities at fair value on an ongoing basis. Unrealized gains and losses on items for which the fair value option has been elected are reported in earnings. The decision to elect the fair value option is determined on an instrument-by-instrument basis, which must be applied to an entire instrument, and not only specified risks, specific cash flows, or portions of that instrument, and is irrevocable once elected. Assets and liabilities measured at fair value pursuant to ASC 825-10 are required to be reported separately from those instruments measured using another accounting method.
	The Company applies the fair value option provisions for eligible assets and liabilities, including bank loans and borrowings, held by consolidated CLOs to mitigate accounting mismatches between the carrying value of the assets and liabilities and to achieve operational simplification. To the extent there is a difference between the change in fair value of the assets and liabilities, the difference is reflected as net income (loss) attributable to nonredeemable noncontrolling interests on the condensed consolidated statements of income and offset by a change in appropriated retained earnings on the condensed consolidated statements of financial condition.
	Derivative Instruments and Hedging Activities.    ASC 815-10, Derivatives and Hedging (“ASC 815-10”), establishes accounting and reporting standards for derivative instruments, including certain derivatives embedded in other contracts and for hedging activities. ASC 815-10 generally requires an entity to recognize all derivatives as either assets or liabilities on the condensed consolidated statements of financial condition and to measure those investments at fair value.
	The Company does not use derivative financial instruments for trading or speculative purposes. The Company may use derivative financial instruments primarily for purposes of hedging: (i) exposures to fluctuations in foreign currency exchange rates of certain assets and liabilities, (ii) market exposures for certain seed investments and (iii) future cash flows on floating-rate notes. The Company may also use derivatives within its separate account assets, which are segregated funds held for purposes of funding individual and group pension contracts. In addition, certain consolidated sponsored investment funds may also invest in derivatives as a part of their investment strategy.
	Changes in the fair value of the Company’s derivative financial instruments are generally recognized in earnings and, where applicable, are offset by the corresponding gain or loss on the related foreign-denominated assets or liabilities or hedged investments, on the condensed consolidated statements of income.
	Separate Account Assets and Liabilities.    Separate account assets are maintained by BlackRock Life Limited, a wholly owned subsidiary of the Company, which is a registered life insurance company in the United Kingdom, and represent segregated assets held for purposes of funding individual and group pension contracts. The life insurance company does not underwrite any insurance contracts that involve any insurance risk transfer from the insured to the life insurance company. The separate account assets primarily include equity securities, debt securities, money market funds and derivatives. The separate account assets are not subject to general claims of the creditors of BlackRock. These separate account assets and the related equal and offsetting liabilities are recorded as separate account assets and separate account liabilities on the condensed consolidated statements of financial condition in accordance with ASC 944-80, Financial Services – Separate Accounts.
	The net investment income attributable to separate account assets supporting individual and group pension contracts accrues directly to the contract owner and is not reported on the condensed consolidated statements of income. While BlackRock has no economic interest in these separate account assets and liabilities, BlackRock earns policy administration and management fees associated with these products, which are included in investment advisory, administration fees and securities lending revenue on the condensed consolidated statements of income.
	Separate Account Collateral Assets Held and Liabilities Under Securities Lending Agreements.    The Company facilitates securities lending arrangements whereby securities held by separate account assets maintained by BlackRock Life Limited are lent to third parties under global master securities lending agreements. In exchange, the Company receives collateral with minimum values generally ranging from approximately 102% to 112% of the value of the securities lent in order to reduce counterparty risk. The required collateral value is calculated on a daily basis. The global master securities lending agreements provide the Company the right to request additional collateral or, in the event of borrower default, the right to liquidate collateral. Under the Company’s securities lending arrangements, the Company can resell or repledge the collateral and the borrower can resell or repledge the loaned securities. The securities lending transactions entered into by the Company are accompanied by an agreement that entitles the Company to request the borrower to return the securities at any time; therefore, these transactions are not reported as sales under ASC 860, Transfers and Servicing.
	As a result of the Company’s ability to resell or repledge the collateral, the Company records on the condensed consolidated statements of financial condition the cash and noncash collateral received under these arrangements as its own asset in addition to an equal and offsetting collateral liability for the obligation to return the collateral. During the nine months ended September 30, 2014 and 2013, the Company had not resold or repledged any of the collateral received under these arrangements. At September 30, 2014 and December 31, 2013, the fair value of loaned securities held by separate account assets was approximately $19.1 billion and $19.7 billion, respectively, and the fair value of the collateral held under these securities lending agreements was approximately $21.0 billion and $21.8 billion, respectively.
	Appropriated Retained Earnings.    Upon the consolidation of CLOs, BlackRock records an adjustment to appropriated retained earnings on the condensed consolidated statements of financial condition equal to the difference between the fair value of the CLOs’ assets and the fair value of their liabilities. Such amounts are recorded as appropriated retained earnings as the CLO noteholders ultimately will receive the benefits or absorb the losses associated with the CLOs’ assets and liabilities. The net change in the fair value of the CLOs’ assets and liabilities is recorded as net income (loss) attributable to nonredeemable noncontrolling interests and as a change to appropriated retained earnings.
	Accounting Pronouncements Adopted in the Nine Months Ended September 30, 2014
	Cumulative Translation Adjustment.    In March 2013, the FASB issued ASU 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (“ASU 2013-05”). ASU 2013-05 addresses the accounting for the cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The adoption of ASU 2013-05 on January 1, 2014 was not material to the condensed consolidated financial statements.
	Investment Company Guidance.    In June 2013, the FASB issued ASU 2013-08, Financial Services – Investment Companies: Amendments to the Scope, Measurement, and Disclosure Requirements (“ASU 2013-08”). ASU 2013-08 amends the current criteria for an entity to qualify as an investment company, creates new disclosure requirements and amends the measurement criteria for certain interests in other investment companies. The adoption of ASU 2013-08 on January 1, 2014 was not material to the condensed consolidated financial statements.
	Presentation of an Unrecognized Tax Benefit.    In July 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The adoption of ASU 2013-11 on January 1, 2014 was not material to the condensed consolidated financial statements.
	Recent Accounting Pronouncements Not Yet Adopted
	Revenue from Contracts with Customers.    In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The Company is currently evaluating the impact of adopting ASU 2014-09, which is effective for the Company on January 1, 2017.
	Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity.    In August 2014, the FASB issued ASU 2014-13, Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity (“ASU 2014-13”). ASU 2014-13 provides an entity that consolidates a collateralized financing entity (“CFE”) that had elected the fair value option for the financial assets and financial liabilities of such CFE an alternative to current fair value measurement guidance. If elected, the Company could measure both the financial assets and the financial liabilities of the CFE by using the more observable of the fair value of the financial assets and the fair value of the financial liabilities. The election would effectively eliminate any measurement difference previously recorded as net income (loss) attributable to nonredeemable noncontrolling interests and as an adjustment to appropriated retained earnings. ASU 2014-13 is effective for the Company on January 1, 2016, with retrospective or modified retrospective approach required. The Company currently expects to early adopt ASU 2014-13 and does not expect the adoption to be material to the consolidated financial statements.

Investments

Investments	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	3.  Investments
	A summary of the carrying value of total investments is as follows:
	(in millions)		September 30,				December 31,
			2014				2013
	Available-for-sale investments			$221				$183
	Held-to-maturity investments			64				83
	Trading investments:
	Consolidated sponsored investment funds			396				385
	Other equity and debt securities			18				43
	Deferred compensation plan mutual funds			63				58
	Total trading investments			477				486
	Other investments:
	Consolidated sponsored investment funds			288				441
	Equity method investments			658				697
	Deferred compensation plan hedge fund equity method investments			21				39
	Cost method investments(1)			96				119
	Carried interest			126				103
	Total other investments			1,189				1,399
	Total investments			$1,951				$2,151
	-1	Amounts primarily include Federal Reserve Bank Stock.
	At September 30, 2014, the Company consolidated $684 million of investments held by consolidated sponsored investment funds (excluding variable interest entities (“VIEs”)) of which $396 million and $288 million were classified as trading investments and other investments, respectively. At December 31, 2013, the Company consolidated $826 million of investments held by consolidated sponsored investment funds (excluding VIEs) of which $385 million and $441 million were classified as trading investments and other investments, respectively.
	Available-for-Sale Investments
	A summary of the cost and carrying value of investments classified as available-for-sale investments is as follows:
	(in millions)
							Gross Unrealized						Carrying
	September 30, 2014		Cost				Gains				Losses		Value
	Equity securities of sponsored investment funds			$222				$7				($8)		$221
	December 31, 2013
	Equity securities of sponsored investment funds			$180				$4				($4)		$180
	Other securities			1				2				-		3
	Total available-for-sale investments			$181				$6				($4)		$183
	Available-for-sale investments primarily included seed investments in BlackRock sponsored mutual funds.
	Held-to-Maturity Investments
	The carrying value of held-to-maturity investments was $64 million and $83 million at September 30, 2014 and December 31, 2013, respectively. Held-to-maturity investments included foreign government debt held for regulatory purposes and the amortized cost (carrying value) of these investments approximated fair value. At September 30, 2014, $48 million of these investments mature in one year or less, $2 million mature after one year through five years, and $14 million mature after 10 years.
	Trading Investments
	A summary of the cost and carrying value of trading investments is as follows:
	(in millions)		September 30, 2014						December 31, 2013
			Cost		Carrying				Cost		Carrying
					Value						Value
	Trading investments:
	Deferred compensation plan mutual funds			$  48		$  63				$  49		$  58
	Equity securities/multi-asset mutual funds			195		212				174		184
	Debt securities/fixed income mutual funds:
	Corporate debt			87		88				128		128
	Government debt			97		101				121		116
	Asset/mortgage backed debt			13		13				-		-
	Total trading investments			$440		$477				$472		$486
	At September 30, 2014, trading investments included $204 million of equity securities and $192 million of debt securities held by consolidated sponsored investment funds, $63 million of certain deferred compensation plan mutual fund investments and $18 million of other equity and debt securities.
	At December 31, 2013, trading investments included $172 million of equity securities and $213 million of debt securities held by consolidated sponsored investment funds, $58 million of certain deferred compensation plan mutual fund investments and $43 million of other equity and debt securities.
	Other Investments
	A summary of the cost and carrying value of other investments is as follows:
	(in millions)		September 30, 2014						December 31, 2013
			Cost		Carrying				Cost		Carrying
					Value						Value
	Other investments:
	Consolidated sponsored investment funds			$274		$288				$420		$441
	Equity method			559		658				613		697
	Deferred compensation plan equity method investments			22		21				37		39
	Cost method investments:
	Federal Reserve Bank stock			91		91				90		90
	Other			5		5				17		29
	Total cost method investments			96		96				107		119
	Carried interest			-		126				-		103
Total other investments			$951		$1,189				$1,177		$1,399
Consolidated sponsored investment funds include third-party private equity funds, direct investments in private companies and third-party hedge funds held by BlackRock sponsored investment funds.
Equity method investments primarily include BlackRock’s direct investments in certain BlackRock sponsored investment funds. See Note 10, Other Assets, for information on the Company’s investment in PennyMac Financial Services, Inc. (“PennyMac”), which is included in other assets on the condensed consolidated statements of financial condition.
Cost method investments include nonmarketable securities, including Federal Reserve Bank stock, which is held for regulatory purposes and is restricted from sale. At September 30, 2014 and December 31, 2013, there were no indicators of impairment on these investments.
Carried interest represents allocations to BlackRock’s general partner capital accounts from certain funds. These balances are subject to change upon cash distributions, additional allocations or reallocations back to limited partners within the respective funds.

Consolidated_Sponsored_Investm

Consolidated Sponsored Investment Funds	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Consolidated Sponsored Investment Funds	'
	4. Consolidated Sponsored Investment Funds
	The Company consolidates certain sponsored investment funds primarily because it is deemed to control such funds. The investments owned by these consolidated sponsored investment funds are classified as trading or other investments. The following table presents the balances related to these consolidated funds that were included on the condensed consolidated statements of financial condition as well as BlackRock’s net interest in these funds:
	(in millions)	September 30,			December 31,
		2014			2013
	Cash and cash equivalents		$  127			$114
	Investments:
	Trading investments		396			385
	Other investments		288			441
	Other assets		17			20
	Other liabilities		(11	)		(39	)
	Noncontrolling interests		(163	)		(189	)
	BlackRock’s net interests in consolidated sponsored investment funds		$654			$732
	BlackRock’s total exposure to consolidated sponsored investment funds represents the value of its economic ownership interest in these sponsored investment funds. Valuation changes associated with investments held at fair value by these consolidated investment funds are reflected in nonoperating income (expense) and partially offset in net income (loss) attributable to noncontrolling interests for the portion not attributable to BlackRock.
	In addition, at September 30, 2014 and December 31, 2013, several consolidated CLOs and one sponsored investment fund, which were deemed to be VIEs, were excluded from the balances in the table above as the balances for these investment products are reported separately on the condensed consolidated statements of financial condition. See Note 6, Variable Interest Entities, for further discussion on these consolidated investment products.
	The Company may not be readily able to access cash and cash equivalents held by consolidated sponsored investment funds to use in its operating activities. In addition, the Company may not be readily able to sell investments held by consolidated sponsored investment funds in order to obtain cash for use in the Company’s operations.

Fair_Value_Disclosures

Fair Value Disclosures	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures	'
	5.  Fair Value Disclosures
	Fair Value Hierarchy
	Assets and liabilities measured at fair value on a recurring basis and other assets not held at fair value
	September 30, 2014		Quoted			Significant Other			Significant			Other Assets			September 30,
	(in millions)		Prices in			Observable Inputs			Unobservable			Not Held at Fair			2014
			Active			(Level 2)			Inputs			Value(1)
			Markets for						(Level 3)
			Identical
			Assets
			(Level 1)
	Assets:
	Investments
	Available-for-sale:
	Equity securities of sponsored investment funds		$	218		$	3		$	-		$	-		$	221
	Held-to-maturity debt securities			-			-			-			64			64
	Trading:
	Deferred compensation plan mutual funds			63			-			-			-			63
	Equity/Multi-asset mutual funds			212			-			-			-			212
	Debt securities / fixed income mutual funds			10			192			-			-			202
	Total trading			285			192			-			-			477
	Other investments:
	Consolidated sponsored investment funds:
	Private / public equity(2)			6			21			258			-			285
	Hedge funds / Funds of funds			-			-			3			-			3
	Total consolidated sponsored investment funds			6			21			261			-			288
	Equity method:
	Hedge funds / Funds of hedge funds			-			241			73			5			319
	Private equity investments			-			-			104			-			104
	Real estate funds			-			21			92			8			121
	Fixed income mutual funds			19			-			-			-			19
	Other			95			-			-			-			95
	Total equity method			114			262			269			13			658
	Deferred compensation plan equity method investments			-			-			21			-			21
	Cost method investments			-			-			-			96			96
	Carried interest			-			-			-			126			126
	Total investments			623			478			551			299			1,951
	Separate account assets			111,222			44,460			-			797			156,479
	Separate account collateral held under securities lending agreements:
	Equity securities			17,197			-			-			-			17,197
	Debt securities			-			3,769			-			-			3,769
	Total separate account collateral held under securities lending agreements			17,197			3,769			-			-			20,966
	Assets of consolidated VIEs:
	Bank loans and other assets			-			2,546			204			65			2,815
	Bonds			-			33			17			-			50
	Private / public equity(3)			2			5			11			-			18
	Total assets of consolidated VIEs			2			2,584			232			65			2,883
	Total		$	129,044		$	51,291		$	783			1,161		$	182,279
	Liabilities:
	Borrowings of consolidated VIEs		$	-		$	-		$	2,889		$	-		$	2,889
	Separate account collateral liabilities under securities lending agreements			17,197			3,769			-			-			20,966
	Other liabilities(4)			-			5			39			-			44
	Total		$	17,197		$	3,774		$	2,928		$	-		$	23,899
		(1)	Amounts are comprised of investments held at cost or amortized cost, carried interest and certain equity method investments, which include sponsored investment funds and other assets, which in accordance with GAAP are not accounted for under a fair value measure. In accordance with GAAP, certain equity method investees do not account for both their financial assets and liabilities under fair value measures; therefore, the Company’s investment in such equity method investees may not represent fair value.
		(2)	Level 3 amounts include $181 million and $77 million of underlying third-party private equity funds and direct investments in private equity companies held by private equity funds, respectively.
		(3)	Level 3 amounts include $11 million of underlying third-party private equity funds held by a consolidated private equity fund of fund.
		(4)	Amounts include a derivative (see Note 7, Derivatives and Hedging, for more information) and contingent liabilities related to the acquisitions of the Credit Suisse ETF franchise and MGPA (see Note 12, Commitments and Contingencies, for more information).
	Assets and liabilities measured at fair value on a recurring basis and other assets not held at fair value
	December 31, 2013		Quoted			Significant			Significant			Other Assets			December 31,
	(in millions)		Prices in			Other			Unobservable			Not Held at			2013
			Active			Observable			Inputs			Fair Value(1)
			Markets for			Inputs			(Level 3)
			Identical			(Level 2)
			Assets
	(Level 1)
Assets:
Investments
Available-for-sale:
Equity securities of sponsored investment funds		$	180		$	-		$	-		$	-		$	180
Other securities			-			3			-			-			3
Total available-for-sale			180			3			-			-			183
Held-to-maturity debt securities			-			-			-			83			83
Trading:
Deferred compensation plan mutual funds			58			-			-			-			58
Equity/Multi-asset mutual funds			184			-			-			-			184
Debt securities / fixed income mutual funds			31			213			-			-			244
Total trading			273			213			-			-			486
Other investments:
Consolidated sponsored investment funds:
Hedge funds / Funds of funds			-			135			24			-			159
Private / public equity(2)			5			13			223			41			282
Total consolidated sponsored investment funds			5			148			247			41			441
Equity method:
Hedge funds / Funds of hedge funds			-			177			99			63			339
Private equity investments			-			-			101			-			101
Real estate funds			-			20			98			7			125
Fixed income mutual funds			113			-			-			-			113
Equity/Multi-asset, alternative mutual funds			19			-			-			-			19
Total equity method			132			197			298			70			697
Deferred compensation plan equity method investments			-			10			29			-			39
Cost method investments			-			-			-			119			119
Carried interest			-			-			-			103			103
Total investments			590			571			574			416			2,151
Separate account assets			113,382			40,841			-			890			155,113
Separate account collateral held under securities lending agreements:
Equity securities			20,856			-			-			-			20,856
Debt securities			-			932			-			-			932
Total separate account collateral held under securities lending agreements			20,856			932			-			-			21,788
Other assets(3)			-			39			-			-			39
Assets of consolidated VIEs:
Bank loans and other assets			-			2,047			129			19			2,195
Bonds			-			71			35			-			106
Private / public equity(4)			-			10			14			-			24
Total assets of consolidated VIEs			-			2,128			178			19			2,325
Total		$	134,828		$	44,511		$	752		$	1,325		$	181,416
Liabilities:
Borrowings of consolidated VIEs		$	-		$	-		$	2,369		$	-		$	2,369
Separate account collateral liabilities under securities lending agreements			20,856			932			-			-			21,788
Other liabilities(5)			18			4			42			-			64
Total		$	20,874		$	936		$	2,411		$	-		$	24,221
	(1)	Amounts are comprised of investments held at cost or amortized cost, carried interest and certain equity method investments, which include sponsored investment funds and other assets, which in accordance with GAAP are not accounted for under a fair value measure. In accordance with GAAP, certain equity method investees do not account for both their financial assets and liabilities under fair value measures; therefore, the Company’s investment in such equity method investees may not represent fair value.
	(2)	Level 3 amounts include $195 million and $28 million of underlying third-party private equity funds and direct investments in private equity companies held by private equity funds, respectively.
	(3)	Amount includes company-owned and split-dollar life insurance policies and unrealized gains on forward foreign currency exchange contracts.
	(4)	Level 3 amounts include $14 million of underlying third-party private equity funds held by a sponsored private equity fund of fund.
	(5)	Amounts include a derivative (see Note 7, Derivatives and Hedging, for more information), securities sold short within consolidated sponsored investment funds and contingent liabilities related to the acquisitions of the Credit Suisse ETF franchise and MGPA (see Note 12, Commitments and Contingencies, for more information).
Level 3 Assets.    Level 3 investments of $551 million and $574 million at September 30, 2014 and December 31, 2013, respectively, primarily related to equity method investments and private equity funds held by consolidated sponsored investment funds. Level 3 assets within investments, except for direct investments in private equity companies held by private equity funds described below, were primarily valued based upon NAVs received from internal and third-party fund managers.
Direct investments in private equity companies held by private equity funds totaled $77 million and $28 million at September 30, 2014 and December 31, 2013, respectively. Direct investments in private equity companies may be valued using the market approach or the income approach, or a combination thereof, and were valued based on an assessment of each underlying investment, incorporating evaluation of additional significant third-party financing, changes in valuations of comparable peer companies, the business environment of the companies, market indices, assumptions relating to appropriate risk adjustments for nonperformance and legal restrictions on disposition, among other factors. The fair value derived from the methods used is evaluated and weighted, as appropriate, considering the reasonableness of the range of values indicated. Under the market approach, fair value may be determined by reference to multiples of market-comparable companies or transactions, including earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples. Under the income approach, fair value may be determined by discounting the expected cash flows to a single present value amount using current expectations about those future amounts. Unobservable inputs used in a discounted cash flow model may include projections of operating performance generally covering a five-year period and a terminal value of the private equity direct investment. For investments utilizing the discounted cash flow valuation technique, a significant increase (decrease) in the discount rate, risk premium or discount for lack of marketability in isolation could result in a significantly lower (higher) fair value measurement. For investments utilizing the market comparable companies valuation technique, a significant increase (decrease) in the EBITDA multiple in isolation could result in a significantly higher (lower) fair value measurement.
Level 3 assets of consolidated VIEs include bank loans and bonds valued based on single-broker nonbinding quotes and direct private equity investments and private equity funds valued based upon internal as well as third-party fund managers, which may be adjusted by using the returns of certain market indices.
Level 3 Liabilities.    Level 3 borrowings of consolidated VIEs include CLO borrowings valued based upon single-broker nonbinding quotes.
Level 3 other liabilities include contingent liabilities related to the acquisitions of the Credit Suisse ETF franchise and MGPA, which were valued based upon discounted cash flow analyses using unobservable market data inputs.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended September 30, 2014
(in millions)		June 30,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
		2014			and						maturities			other			into			out of			2014		unrealized
					unrealized									settlements(1)			Level 3			Level 3					gains (losses)
					gains																				included in
					(losses) in																				earnings(2)
					earnings
					and OCI
Assets:
Investments
Consolidated sponsored investment funds:
Hedge funds / Funds of funds			$5			$-			$-			($2	)		$-			$-			$-			$3		$1
Private equity			272			1			12			(26	)		(1	)		-			-			258		(3	)
Equity method:
Hedge funds / Funds of hedge funds			84			2			5			(4	)		(14	)		-			-			73		-
Private equity investments			106			1			4			-			(7	)		-			-			104		2
Real estate funds			96			3			1			(2	)		(6	)		-			-			92		1
Deferred compensation plan equity method investments			27			(3	)		-			-			(3	)		-			-			21		(2	)
Total Level 3 investments			590			4			22			(34	)		(31	)		-			-			551		(1	)
Assets of consolidated VIEs:
Bank loans			153			(3	)		63			(36	)		-			87			(60	)		204
Bonds			25			-			-			(8	)		-			-			-			17
Private equity			13			-			-			(2	)		-			-			-			11
Total Level 3 assets of consolidated VIEs			191			(3	)		63			(46	)		-			87			(60	)		232		n/a	(3)
Total Level 3 assets			$781			$1			$85			($80	)		($31	)		$87			($60	)		$783
Liabilities:
Borrowings of consolidated VIEs			$2,699			$26			$-			$-			$216			$-			$-			$2,889		n/a	(3)
Other liabilities			43			-			-			-			(4	)		-			-			39		-
Total Level 3 liabilities			$2,742			$26			$-			$-			$212			$-			$-			$2,928
	n/a	– not applicable
	(1)	Amount primarily includes distributions from equity method investees and net proceeds from (repayments of) borrowings by consolidated VIEs.
	(2)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(3)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Nine Months Ended September 30, 2014
(in millions)		December 31,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
		2013			and						maturities			other			into			out of			2014		unrealized
					unrealized									settlements(1)			Level 3			Level 3					gains (losses)
					gains																				included in
					(losses) in																				earnings(3)
					earnings
					and OCI
Assets:
Investments
Consolidated sponsored investment funds:
Hedge funds / Funds of funds			$24			$-			$-			($20	)		($1	)		$-			$-			$3		$-
Private equity			223			14			37			(56	)		(1	)		41	(2)		-			258		9
Equity method:
Hedge funds / Funds of hedge funds			99			6			13			(11	)		(34	)		-			-			73		4
Private equity investments			101			10			11			-			(18	)		-			-			104		11
Real estate funds			98			12			5			(5	)		(18	)		-			-			92		10
Deferred compensation plan equity method investments			29			(1	)		-			-			(7	)		-			-			21		-
Total Level 3 investments			574			41			66			(92	)		(79	)		41			-			551		34
Assets of consolidated VIEs:
Bank loans			129			(3	)		155			(79	)		-			196			(194	)		204
Bonds			35			-			-			(18	)		-			-			-			17
Private equity			14			1			-			(4	)		-			-			-			11
Total Level 3 assets of consolidated VIEs			178			(2	)		155			(101	)		-			196			(194	)		232		n/a	(4)
Total Level 3 assets			$752			$39			$221			($193	)		($79	)		$237			($194	)		$783
Liabilities:
Borrowings of consolidated VIEs			$2,369			$40			$-			$-			$560			$-			$-			$2,889		n/a	(4)
Other liabilities			42			(1	)		-			-			(4	)		-			-			39		-
Total Level 3 liabilities			$2,411			$39			$-			$-			$556			$-			$-			$2,928
	n/a	– not applicable
	(1)	Amount primarily includes distributions from equity method investees and net proceeds from (repayments of) borrowings by consolidated VIEs.
	(2)	Includes investments previously held at cost.
	(3)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(4)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended September 30, 2013
(in millions)		June 30,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
		2013			and						maturities			other			into			out of			2013		gains (losses)
					unrealized									settlements(1)			Level 3			Level 3					included in
					gains																				earnings(2)
					(losses) in
					earnings
					and OCI
Assets:
Investments
Available-for-sale:
Equity securities (CDOs)			$1			$-			$-			$-			$-			$-			$-			$1		$-
Consolidated sponsored investment funds:
Hedge funds / Funds of funds			47			2			-			(2	)		(2	)		-			-			45		-
Private equity			249			10			-			(23	)		-			-			(2	)		234		7
Equity method:
Hedge funds / Funds of hedge funds			157			1			1			(1	)		(13	)		-			-			145		1
Private equity investments			105			4			1			(10	)		(2	)		-			-			98		4
Real estate funds			97			6			2			-			(2	)		-			-			103		6
Total Level 3 investments			656			23			4			(36	)		(19	)		-			(2	)		626		18
Assets of consolidated VIEs:
Bank loans			93			-			18			(8	)		-			40			(46	)		97
Bonds			35			1			-			(1	)		-			-			-			35
Private equity			19			-			-			(2	)		-			-			-			17
Total Level 3 assets of consolidated VIEs			147			1			18			(11	)		-			40			(46	)		149		n/a	(3)
Total Level 3 assets			$803			$24			$22			($47	)		($19	)		$40			($48	)		$775
Liabilities:
Borrowings of consolidated VIEs			$2,145			($5	)		$-			$-			($82	)		$-			$-			$2,068		n/a	(3)
Other liabilities			-			-			-			-			33			-			-			33
Total Level 3 liabilities			$2,145			($5	)		$-			$-			($49	)		$-			$-			$2,101
	n/a	– not applicable
	(1)	Amounts primarily include distributions from equity method investees, repayments of borrowings of consolidated VIEs and a contingent liability related to the acquisition of Credit Suisse’s ETF franchise.
	(2)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(3)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Nine Months Ended September 30, 2013
(in millions)		December 31,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
		2012			and						maturities			other			into			out of			2013		gains
					unrealized									settlements(1)			Level 3			Level 3					(losses)
					gains																				included in
					(losses) in																				earnings(2)
					earnings
					and OCI
Assets:
Investments
Available-for-sale:
Equity securities (CDOs)			$1			$-			$-			$-			$-			$-			$-			$1		$-
Consolidated sponsored investment funds:
Hedge funds / Funds of hedge funds			73			8			12			(11	)		(30	)		-			(7	)		45		6
Private equity			266			26			12			(62	)		-			-			(8	)		234		21
Equity method:
Hedge funds / Funds of hedge funds			161			10			2			(1	)		(27	)		-			-			145		10
Private equity investments			90			14			10			(10	)		(6	)		-			-			98		14
Real estate funds			88			14			5			-			(4	)		-			-			103		14
Total Level 3 investments			679			72			41			(84	)		(67	)		-			(15	)		626		65
Separate account assets			2			-			-			(2	)		-			-			-			-		n/a	(3)
Assets of consolidated VIEs:
Bank loans			106			(1	)		91			(48	)		-			71			(122	)		97
Bonds			46			-			4			(15	)		-			-			-			35
Private equity			22			1			-			(6	)		-			-			-			17
Fund of hedge funds			-			-			134			-			(134	)		-			-			-
Total Level 3 assets of consolidated VIEs			174			-			229			(69	)		(134	)		71			(122	)		149		n/a	(4)
Total Level 3 assets			$855			$72			$270			($155	)		($201	)		$71			($137	)		$775
Liabilities:
Borrowings of consolidated VIEs			$2,402			($9	)		$-			$-			($343	)		$-			$-			$2,068		n/a	(4)
Other liabilities			-			-			-			-			33			-			-			33
Total Level 3 liabilities			$2,402			($9	)		$-			$-			($310	)		$-			$-			$2,101
	n/a	– not applicable
	(1)	Amounts primarily include distributions from equity method investees, repayments of borrowings of consolidated VIEs, elimination of investment related to a deconsolidation of a consolidated VIE, a reclassification of an investment from a consolidated sponsored investment fund to an equity method investment due to a change in ownership percentage and a contingent liability related to the acquisition of Credit Suisse’s ETF franchise.
	(2)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(3)	The net investment income attributable to separate account assets accrues directly to the contract owners and is not reported on the condensed consolidated statements of income.
	(4)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Realized and Unrealized Gains (Losses) for Level 3 Assets and Liabilities.    Realized and unrealized gains (losses) recorded for Level 3 assets and liabilities are reported in nonoperating income (expense) on the condensed consolidated statements of income. A portion of net income (loss) for consolidated investments and all of the net income (loss) for consolidated VIEs are allocated to noncontrolling interests to reflect net income (loss) not attributable to the Company.
Transfers in and/or out of Levels.    Transfers in and/or out of levels are reflected when significant inputs, including market inputs or performance attributes, used for the fair value measurement become observable/unobservable, or when the Company determines it has the ability, or no longer has the ability, to redeem, in the near term, certain investments that the Company values using a NAV (or a capital account), or when the carrying value of certain equity method investments no longer represents fair value as determined under valuation methodologies.
Assets of Consolidated VIEs.    During the three and nine months ended September 30, 2014, there were $60 million and $194 million, respectively, of transfers out of Level 3 to Level 2 related to bank loans. In addition, during the three and nine months ended September 30, 2014, there were $87 million and $196 million, respectively, of transfers into Level 3 from Level 2 related to bank loans. These transfers in and out of levels were primarily due to availability/unavailability of observable market inputs, including inputs from pricing vendors and brokers.
During the three and nine months ended September 30, 2013, there were $46 million and $122 million, respectively, of transfers out of Level 3 to Level 2 related to bank loans. In addition, during the three and nine months ended September 30, 2013, there were $40 million and $71 million, respectively, of transfers into Level 3 from Level 2 related to bank loans. These transfers in and out of Levels 2 and 3 were primarily due to availability/unavailability of observable market inputs, including inputs from pricing vendors and brokers.
Significant Issuances and Other Settlements.    During the three and nine months ended September 30, 2014, other settlements included $409 million and $1,021 million, respectively, of borrowings due to a consolidation of CLOs. In addition, during the three and nine months ended September 30, 2014, other settlements included $193 million and $461 million, respectively, of repayments of borrowings of consolidated CLOs.
During the three and nine months ended September 30, 2014, there were $30 million and $77 million, respectively, of distributions from equity method investees categorized in Level 3.
During the three and nine months ended September 30, 2013, there were $17 million and $37 million, respectively, of distributions from equity method investees categorized in Level 3.
During the nine months ended September 30, 2013, other settlements included $134 million related to a deconsolidation of a consolidated fund of hedge funds, which was previously classified as a VIE. This fund was deconsolidated during the second quarter of 2013 due to the granting of additional substantive rights to unaffiliated investors of the fund.
In addition, during the nine months ended September 30, 2013, there was a $28 million reclassification of a Level 3 investment from a consolidated sponsored investment fund to an equity method investment due to a change in BlackRock’s ownership percentage.
Disclosures of Fair Value for Financial Instruments Not Held at Fair Value.    At September 30, 2014 and December 31, 2013, the fair value of the Company’s financial instruments not held at fair value are categorized in the table below:
		September 30, 2014						December 31, 2013
(in millions)		Carrying			Estimated			Carrying			Estimated			Fair Value
		Amount			Fair Value			Amount			Fair Value			Hierarchy
Financial Assets:
Cash and cash equivalents		$	6,149		$	6,149		$	4,390		$	4,390			Level 1	(1)(2)
Accounts receivable			2,631			2,631			2,247			2,247			Level 1	(3)
Cash and cash equivalents of consolidated VIEs			175			175			161			161			Level 1	(1)
Financial Liabilities:
Accounts payable and accrued liabilities			1,576			1,576			1,084			1,084			Level 1	(3)
Long-term borrowings			5,937			6,295			4,939			5,284			Level 2	(4)
	(1)	Cash and cash equivalents are carried at either cost or amortized cost, which approximates fair value due to their short-term maturities.
	(2)	At September 30, 2014 and December 31, 2013, approximately $94 million and $64 million, respectively, of money market funds were recorded within cash and cash equivalents on the condensed consolidated statements of financial condition. Money market funds are valued based on quoted market prices, or $1.00 per share, which generally is the NAV of the fund. At September 30, 2014 and December 31, 2013, approximately $127 million and $114 million, respectively, related to cash and cash equivalents held by consolidated sponsored investment funds.
	(3)	The carrying amounts of accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term nature.
	(4)	Long-term borrowings are recorded at amortized cost. The fair value of the long-term borrowings, including the current portion of long-term borrowings, is estimated using market prices at the end of September 2014 and December 2013, respectively. See Note 11, Borrowings, for the fair value of each of the Company’s long-term borrowings.
Investments in Certain Entities that Calculate Net Asset Value Per Share.
As a practical expedient to value certain investments that do not have a readily determinable fair value and have attributes of an investment company, the Company uses NAV as the fair value. The following tables list information regarding all investments that use a fair value measurement to account for both their financial assets and financial liabilities in their calculation of a NAV per share (or its equivalent).
September 30, 2014
(in millions)		Ref			Fair Value			Total Unfunded		Redemption	Redemption
								Commitments		Frequency	Notice Period
Consolidated sponsored investment funds:
Private equity funds/funds of funds			(a	)		$181		$  24		n/r	n/r
Other funds of hedge funds			(b	)		2		-		Quarterly(100%)	60 –
											90 days
Equity method:(1)
Hedge funds/funds of hedge funds			(c	)		314		43		Monthly(31%)	15 –
											90 days
										Quarterly(47%)
										n/r(22%)
Private equity funds			(d	)		104		67		n/r	n/r
Real estate funds			(e	)		113		9		Quarterly(19%)	60 days
										n/r(81%)
Deferred compensation plan investments			(f	)		21		5		n/r	n/r
Consolidated VIEs:
Private equity fund			(g	)		11		1		n/r	n/r
Total						$746		$149
December 31, 2013
(in millions)		Ref			Fair Value			Total		Redemption	Redemption
								Unfunded		Frequency	Notice Period
								Commitments
Consolidated sponsored investment funds:
Private equity funds of funds			(a	)		$195		$23		n/r	n/r
Other funds of hedge funds			(b	)		155		-		Monthly(13%)	30 – 90 days
										Quarterly(78%)
										n/r(9%)
Equity method:(1)
Hedge funds/funds of hedge funds			(c	)		276		84		Monthly(55%)	15 – 90 days
										Quarterly(11%)
										n/r(34%)
Private equity funds			(d	)		101		62		n/r	n/r
Real estate funds			(e	)		118		12		Quarterly(17%)	60 days
										n/r(83%)
Deferred compensation plan investments			(f	)		39		7		Monthly(8%)	60 – 90 days
										Quarterly(18%)
										n/r(74%)
Consolidated VIEs:
Private equity fund			(g	)		14		1		n/r	n/r
Total						$898		$189
	n/r	– not redeemable
	(1)	Comprised of equity method investments, which include investment companies, which account for their financial assets and most financial liabilities under fair value measures; therefore, the Company’s investment in such equity method investees approximates fair value.
	(a)	This category includes the underlying third-party private equity funds within consolidated BlackRock sponsored private equity funds of funds. The fair values of the investments in the third-party funds have been estimated using capital accounts representing the Company’s ownership interest in each fund in the portfolio as well as other performance inputs. These investments are not subject to redemption; however, for certain funds, the Company may sell or transfer its interest, which may need approval by the general partner of the underlying funds. Due to the nature of the investments in this category, the Company reduces its investment by distributions that are received through the realization of the underlying assets of the funds. It is estimated that the underlying assets of these funds will be liquidated over a weighted-average period of approximately six years and seven years at September 30, 2014 and December 31, 2013. The total remaining unfunded commitments to other third-party funds were $24 million and $23 million at September 30, 2014 and December 31, 2013, respectively. The Company had contractual obligations to the consolidated funds of $33 million and $30 million at September 30, 2014 and December 31, 2013, respectively.
	(b)	This category includes consolidated funds of hedge funds that invest in multiple strategies to diversify risks. The fair values of the investments have been estimated using the NAV of the fund’s ownership interest in partners’ capital of each fund in the portfolio. Certain of the underlying funds can be redeemed as long as there are no restrictions in place.
	(c)	This category includes hedge funds and funds of hedge funds that invest primarily in equities, fixed income securities, distressed credit, opportunistic and mortgage instruments and other third-party hedge funds. The fair values of the investments have been estimated using the NAV of the Company’s ownership interest in partners’ capital. It was estimated that the investments in the funds that are not subject to redemption will be liquidated over a weighted-average period of approximately two years and three years at September 30, 2014 and December 31, 2013, respectively.
	(d)	This category includes several private equity funds that initially invest in nonmarketable securities of private companies, which ultimately may become public in the future. The fair values of these investments have been estimated using capital accounts representing the Company’s ownership interest in the funds as well as other performance inputs. The Company’s investment in each fund is not subject to redemption and is normally returned through distributions as a result of the liquidation of the underlying assets of the private equity funds. It was estimated that the investments in these funds will be liquidated over a weighted-average period of approximately four years and five years at September 30, 2014 and December 31, 2013, respectively.
	(e)	This category includes several real estate funds that invest directly in real estate and real estate related assets. The fair values of the investments have been estimated using capital accounts representing the Company’s ownership interest in the funds. A majority of the Company’s investments are not subject to redemption or are not currently redeemable and are normally returned through distributions as a result of the liquidation of the underlying assets of the real estate funds. It is estimated that the investments in these funds not subject to redemptions will be liquidated over a weighted-average period of approximately seven years at both September 30, 2014 and December 31, 2013.
	(f)	This category includes investments in several real estate funds and certain hedge funds that invest in energy and health science related equity securities. The fair values of the investments in this category have been estimated using capital accounts representing the Company’s ownership interest in partners’ capital as well as performance inputs. The investments in hedge funds will be redeemed upon settlement of certain deferred compensation liabilities. The real estate investments are not subject to redemption; however, distributions as a result of the liquidation of the underlying assets will be used to settle certain deferred compensation liabilities over time.
	(g)	This category includes the underlying third-party private equity funds within one consolidated BlackRock sponsored private equity fund of funds. The fair values of the investments in the third-party funds have been estimated using capital accounts representing the Company’s ownership interest in each fund in the portfolio as well as other performance inputs. These investments are not subject to redemption; however, for certain funds the Company may sell or transfer its interest, which may need approval by the general partner of the underlying third-party funds. Due to the nature of the investments in this category, the Company reduces its investment by distributions that are received through the realization of the underlying assets of the funds. It is estimated that the underlying assets of these funds will be liquidated over a weighted-average period of approximately one and two years at September 30, 2014 and December 31, 2013, respectively. Total remaining unfunded commitments to other third-party funds were not material at both September 30, 2014 and December 31, 2013, which commitments are required to be funded by capital contributions from noncontrolling interest holders.
Fair Value Option.
The following table summarizes information at September 30, 2014 and December 31, 2013 related to those assets and liabilities for which the fair value option was elected:
(in millions)		September 30,			December 31,
		2014			2013
CLO Bank Loans:
Aggregate principal amounts outstanding			$2,799			$2,181
Fair value			2,750			2,176
Aggregate unpaid principal balance in excess of (less than) fair value			$49			$5
Unpaid principal balance of loans more than 90 days past due			$6			$14
Aggregate fair value of loans more than 90 days past due			2			9
Aggregate unpaid principal balance in excess of fair value for loans more than 90 days past due			$4			$5
CLO Borrowings:
Aggregate principal amounts outstanding			$2,970			$2,455
Fair value			$2,889			$2,369
At September 30, 2014, the principal amounts outstanding of the borrowings issued by the CLOs mature between 2016 and 2026.
During the three and nine months ended September 30, 2014, the change in fair value of the bank loans and bonds held by the CLOs resulted in a $6 million loss and a $73 million gain, respectively, which were offset by a $23 million and a $73 million loss, respectively, from the change in fair value of the CLO borrowings.
During the three and nine months ended September 30, 2013, the change in fair value of the bank loans and bonds held by the CLOs resulted in a $25 million and $104 million gain, respectively. The gains were offset by a $28 million and $92 million loss during the three and nine months ended September 30, 2013, respectively, from the change in fair value of the CLO borrowings.
The net gains (losses) were recorded in net gain (loss) on consolidated VIEs on the condensed consolidated statements of income.
The change in fair value of the assets and liabilities included interest income and expense, respectively.

Variable_Interest_Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Variable Interest Entities	'
	6.  Variable Interest Entities
	In the normal course of business, the Company is the manager of various types of sponsored investment vehicles, including CDOs/CLOs and sponsored investment funds, which may be considered VIEs. The Company receives advisory fees and/or other incentive-related fees for its services and may from time to time own equity or debt securities or enter into derivatives with the vehicles, each of which are considered variable interests. The Company enters into these variable interests principally to address client needs through the launch of such investment vehicles. The VIEs are primarily financed via capital contributed by equity and debt holders. The Company’s involvement in financing the operations of the VIEs is generally limited to its equity interests.
	The primary beneficiary (“PB”) of a VIE that is an investment fund that meets the conditions of ASU 2010-10, Amendments to Statement 167 for Certain Investment Funds (“ASU 2010-10”), is the enterprise that has a variable interest (or combination of variable interests, including those of related parties) that will absorb a majority of the entity’s expected losses, receive a majority of the entity’s expected residual returns or both. In order to determine whether the Company is the PB of a VIE, management must make significant estimates and assumptions of probable future cash flows of the VIEs. Assumptions made in such analyses may include, but are not limited to, market prices of securities, market interest rates, potential credit defaults on individual securities or default rates on a portfolio of securities, prepayments, realization of gains, liquidity or marketability of certain securities, discount rates and the probability of certain other outcomes.
	The PB of a CDO/CLO or other entity that is a VIE that does not meet the conditions of ASU 2010-10 is the enterprise that has the power to direct activities of the entity that most significantly impact the entity’s economic performance and has the obligation to absorb losses or the right to receive benefits that potentially could be significant to the entity.
	Consolidated VIEs.    Consolidated VIEs included CLOs in which BlackRock did not have an investment; however, BlackRock, as the collateral manager, was deemed to have both the power to control the activities of the CLOs and the right to receive benefits that could potentially be significant to the CLOs. In addition, BlackRock was the PB of one investment fund because it absorbed the majority of the variability due to its de facto related-party relationships with other partners in the fund. The assets of these VIEs are not available to creditors of the Company. In addition, the investors in these VIEs have no recourse to the credit of the Company. At September 30, 2014 and December 31, 2013, the following balances related to VIEs were consolidated on the condensed consolidated statements of financial condition:
	(in millions)		September 30, 2014		December 31, 2013
	Assets of consolidated VIEs:
	Cash and cash equivalents			$175		$161
	Bank loans			2,750		2,176
	Bonds			50		106
	Other investments and other assets			83		43
	Total bank loans, bonds, other investments and other assets			2,883		2,325
	Liabilities of consolidated VIEs:
	Borrowings			-2,889		-2,369
	Other liabilities			-167		-74
	Appropriated retained earnings			13		-22
	Noncontrolling interests of consolidated VIEs			-15		-21
	Total BlackRock net interests in consolidated VIEs			$-		$-
	For the three and nine months ended September 30, 2014, the Company recorded nonoperating expense of $47 million and $35 million, respectively, offset by a $47 million and a $35 million net expense attributable to nonredeemable noncontrolling interests, respectively, on the condensed consolidated statements of income.
	For the three and nine months ended September 30, 2013, the Company recorded nonoperating expense of $6 million and $2 million, respectively, offset by a $6 million and $2 million net expense attributable to nonredeemable noncontrolling interests, respectively, on the condensed consolidated statements of income.
	At September 30, 2014 and December 31, 2013, the weighted-average maturity of the bank loans and bonds were approximately 4.9 and 4.7 years, respectively.
	Nonconsolidated VIEs.    At September 30, 2014 and December 31, 2013, the Company’s carrying value of assets and liabilities and its maximum risk of loss related to VIEs for which it was the sponsor or in which it held a variable interest, but for which it was not the PB, was as follows:
	(in millions)		Variable Interests on the Condensed
			Consolidated
			Statement of Financial Condition
	At September 30, 2014		Investments		Advisory		Other Net		Maximum
					Fee		Assets		Risk of Loss(1)
					Receivables		(Liabilities)
	CDOs/CLOs			$-		$1		($5)		$18
	Other sponsored investment funds:
	Collective trusts			-		209		-		209
	Other			34		179		-4		213
	Total			$34		$389		($9)		$440
	At December 31, 2013
	CDOs/CLOs			$-		$1		($4)		$18
	Other sponsored investment funds:
	Collective trusts			-		184		-		184
	Other			37		137		-6		174
	Total			$37		$322		($10)		$376
	(1)	At both September 30, 2014 and December 31, 2013, BlackRock’s maximum risk of loss associated with these VIEs primarily related to advisory fee receivables and BlackRock’s investments.
	The net assets related to the above CDOs/CLOs that the Company does not consolidate were as follows:
	(in billions)		September 30, 2014		December 31, 2013
	Assets at fair value			$1		$1
	Liabilities(1)			2		2
	Net assets			($1)		($1)
	(1)	Amounts primarily comprised of unpaid principal debt obligations to CDO/CLO debt holders.
	The net assets of other sponsored investment funds that are nonconsolidated VIEs approximated $1.7 trillion to $1.8 trillion at September 30, 2014 and $1.6 trillion to $1.7 trillion at December 31, 2013. Net assets included $1.4 trillion of collective trusts at both September 30, 2014 and at December 31, 2013. Each collective trust has been aggregated separately and may include collective trusts that invest in other collective trusts. The net assets of these VIEs primarily are comprised of cash and cash equivalents and investments, partially offset by liabilities primarily comprised of various accruals for the sponsored investment vehicles.

Derivatives_and_Hedging

Derivatives and Hedging	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives and Hedging	'
	7.  Derivatives and Hedging
	The Company maintains a program to enter into swaps to hedge against market price and interest rate exposures with respect to certain seed investments in sponsored investment products. At September 30, 2014, the Company had outstanding total return swaps and interest rate swaps with an aggregate notional value of approximately $176 million and $79 million, respectively. At December 31, 2013, the Company had outstanding total return swaps and interest rate swaps with an aggregate notional value of approximately $117 million and $71 million, respectively.
	The Company has entered into a derivative, providing credit protection to a counterparty of approximately $17 million, representing the Company’s maximum risk of loss with respect to the provision of credit protection. The Company carries the derivative at fair value based on the expected future cash flows under the arrangement.
	The fair values of the outstanding derivatives were not material to the condensed consolidated statements of financial condition at both September 30, 2014 and December 31, 2013.
	The Company executes forward foreign currency exchange contracts to mitigate the risk of foreign exchange movements. At September 30, 2014, the Company had outstanding forward foreign currency exchange contracts with an aggregate notional value of approximately $180 million. The fair value of the forward foreign currency exchange contracts at September 30, 2014 was not material to the condensed consolidated statements of financial condition. At December 31, 2013, the Company had outstanding forward foreign currency exchange contracts with an aggregate notional value of approximately $792 million and a fair value of approximately $26 million.
	Gains (losses) on the derivatives were not material to the condensed consolidated statements of income for the three and nine months ended September 30, 2014 and 2013.
	The Company consolidates certain sponsored investment funds, which may utilize derivative instruments as a part of the funds’ investment strategies. The fair value of such derivatives at September 30, 2014 and December 31, 2013 was not material. The change in fair value of such derivatives, which is recorded in nonoperating income (expense), was not material for the three and nine months ended September 30, 2014 and 2013.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	8.  Goodwill
	Goodwill activity during the nine months ended September 30, 2014 was as follows:
	(in millions)
	December 31, 2013		$12,980
	Goodwill adjustment related to Quellos(1)		(14	)
	September 30, 2014		$12,966
	(1)	The decrease in goodwill during the nine months ended September 30, 2014 resulted from a decline related to tax benefits realized from tax-deductible goodwill in excess of book goodwill from the acquisition of the fund-of-funds business of Quellos Group, LLC in October 2007 (the “Quellos Transaction”). Goodwill related to the Quellos Transaction will continue to be reduced in future periods by the amount of tax benefits realized from tax-deductible goodwill in excess of book goodwill from the Quellos Transaction. The balance of the Quellos tax-deductible goodwill in excess of book goodwill was approximately $269 million and $293 million at September 30, 2014 and December 31, 2013, respectively.

Intangible_Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets	'
	9.  Intangible Assets
	The carrying amounts of identifiable intangible assets are summarized as follows:
	(in millions)	Indefinite-lived			Finite-lived			Total
		intangible assets			intangible assets			intangible assets
	December 31, 2013		$16,991			$510			$17,501
	Amortization expense		-			(122	)		(122	)
	Other		(1	)		-			(1	)
	September 30, 2014		$16,990			$388			$17,378

Other_Assets

Other Assets	9 Months Ended
	Sep. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Other Assets	'
	10.  Other Assets
	At March 31, 2013, BlackRock held an approximately one-third economic equity interest in Private National Mortgage Acceptance Company, LLC (“PNMAC”), which is accounted for as an equity method investment and is included in other assets on the condensed consolidated statements of financial condition. On May 8, 2013, PennyMac became the sole managing member of PNMAC in connection with an initial public offering of PennyMac (the “PennyMac IPO”). As a result of the PennyMac IPO, BlackRock recorded a noncash, nonoperating pre-tax gain of $39 million related to the carrying value of its equity method investment.
	Subsequent to the PennyMac IPO, the Company contributed 6.1 million units of its PennyMac investment to a new donor advised fund (the “Charitable Contribution”). The fair value of the Charitable Contribution was $124 million and is included in general and administration expense on the condensed consolidated statements of income for the nine months ended September 30, 2013. In connection with the Charitable Contribution, the Company also recorded a noncash, nonoperating pre-tax gain of $80 million related to the contributed investment and a tax benefit of approximately $57 million in the second quarter of 2013.
	The carrying value and fair value of the Company’s interest (approximately 20% or 16 million shares and units) was approximately $155 million and $228 million, respectively, at September 30, 2014 and approximately $127 million and $273 million, respectively, at December 31, 2013. The fair value of the Company’s interest reflected the PennyMac stock price at September 30, 2014 and December 31, 2013, respectively (a Level 1 input).
	See Note 11, Other Assets, in the 2013 Form 10-K for more information.

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Borrowings	'
	11.  Borrowings
	Short-Term Borrowings
	2014 Revolving Credit Facility.    In March 2014, the Company’s credit facility was amended to extend the maturity date by one year to March 2019. The amount of the aggregate commitment is $3.990 billion (the “2014 credit facility”). The 2014 credit facility permits the Company to request up to an additional $1.0 billion of borrowing capacity, subject to lender credit approval, increasing the overall size of the 2014 credit facility to an aggregate principal amount not to exceed $4.990 billion. Interest on borrowings outstanding accrues at a rate based on the applicable London Interbank Offered Rate plus a spread. The 2014 credit facility requires the Company not to exceed a maximum leverage ratio (ratio of net debt to earnings before interest, taxes, depreciation and amortization, where net debt equals total debt less unrestricted cash) of 3 to 1, which was satisfied with a ratio of less than 1 to 1 at September 30, 2014. At September 30, 2014, the Company had no amount outstanding under the 2014 credit facility.
	Commercial Paper Program.    In April 2013, BlackRock increased the maximum aggregate amount for which the Company could issue unsecured commercial paper notes (the “CP Notes”) on a private-placement basis up to a maximum aggregate amount outstanding at any time of $3.990 billion. The commercial paper program is currently supported by the 2014 credit facility. At September 30, 2014 and December 31, 2013, BlackRock had no CP Notes outstanding.
	Long-Term Borrowings
	The carrying value and fair value of long-term borrowings determined using market prices at the end of September 2014 included the following:
	(in millions)	Maturity Amount		Unamortized		Carrying Value		Fair Value
				Discount
	3.50% Notes due 2014		$1,000		$-		$1,000		$1,005
	1.375% Notes due 2015		750		-		750		755
	6.25% Notes due 2017		700		-1		699		793
	5.00% Notes due 2019		1,000		-2		998		1,150
	4.25% Notes due 2021		750		-3		747		814
	3.375% Notes due 2022		750		-4		746		765
	3.50% Notes due 2024		1,000		-3		997		1,013
	Total Long-term Borrowings		$5,950		($13)		$5,937		$6,295
	Long-term borrowings at December 31, 2013 had a carrying value of $4.939 billion and a fair value of $5.284 billion determined using market prices at the end of December 2013.
	2024 Notes.    In March 2014, the Company issued $1.0 billion in aggregate principal amount of 3.50% senior unsecured and unsubordinated notes maturing on March 18, 2024 (the “2024 Notes”). The net proceeds of the 2024 Notes are intended to be used for general corporate purposes, including refinancing of certain indebtedness which matures in the fourth quarter of 2014. Interest is payable semi-annually in arrears on March 18 and September 18 of each year, or approximately $35 million per year. The 2024 Notes may be redeemed prior to maturity at any time in whole or in part at the option of the Company at a “make-whole” redemption price. The 2024 Notes were issued at a discount of $3 million that is being amortized over the term of the notes. The Company incurred approximately $6 million of debt issuance costs, which are being amortized over the term of the 2024 Notes.
	See Note 12, Borrowings, in the 2013 Form 10-K for more information regarding the Company’s borrowings.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	12.  Commitments and Contingencies
	Investment Commitments.    At September 30, 2014, the Company had $210 million of various capital commitments to fund sponsored investment funds, including funds of private equity funds, real estate funds, infrastructure funds, opportunistic funds and distressed credit funds. This amount excludes additional commitments made by consolidated funds of funds to underlying third-party funds as third-party noncontrolling interest holders have the legal obligation to fund the respective commitments of such funds of funds. In addition to the capital commitments of $210 million, the Company had approximately $35 million of contingent commitments for certain funds which have investment periods that have expired. Generally, the timing of the funding of these commitments is unknown and the commitments are callable on demand at any time prior to the expiration of the commitment. These unfunded commitments are not recorded on the condensed consolidated statements of financial condition. These commitments do not include potential future commitments approved by the Company, but which are not yet legally binding. The Company intends to make additional capital commitments from time to time to fund additional investment products for, and with, its clients.
	Contingencies
	Contingent Payments.    The Company acts as the portfolio manager in a series of derivative transactions and has a maximum potential exposure of $17 million under a derivative between the Company and counterparty. See Note 7, Derivatives and Hedging, for further discussion.
	Contingent Payments Related to Business Acquisitions.    In connection with the Credit Suisse ETF Transaction, BlackRock is required to make contingent payments annually to Credit Suisse, subject to achieving specified thresholds during a seven-year period, subsequent to the 2013 acquisition date. In addition, BlackRock is required to make contingent payments related to the MGPA Transaction during a five-year period, subject to achieving specified thresholds, subsequent to the 2013 acquisition date. The fair value of the remaining contingent payments at September 30, 2014 is not significant to the condensed consolidated statement of financial condition and is included in other liabilities.
	Legal Proceedings.    From time to time, BlackRock receives subpoenas or other requests for information from various U.S. federal, state governmental and domestic and international regulatory authorities in connection with certain industry-wide or other investigations or proceedings. It is BlackRock’s policy to cooperate fully with such inquiries. The Company and certain of its subsidiaries have been named as defendants in various legal actions, including arbitrations and other litigation arising in connection with BlackRock’s activities. Additionally, certain BlackRock-sponsored investment funds that the Company manages are subject to lawsuits, any of which potentially could harm the investment returns of the applicable fund or result in the Company being liable to the funds for any resulting damages.
	Management, after consultation with legal counsel, currently does not anticipate that the aggregate liability, if any, arising out of regulatory matters or lawsuits, will have a material effect on BlackRock’s results of operations, financial position, or cash flows. However, there is no assurance as to whether any such pending or threatened matters will have a material effect on BlackRock’s results of operations, financial position or cash flows in any future reporting period. Due to uncertainties surrounding the outcome of these matters, management cannot reasonably estimate the possible loss or range of loss that may arise from these matters.
	Indemnifications.    In the ordinary course of business or in connection with certain acquisition agreements, BlackRock enters into contracts pursuant to which it may agree to indemnify third parties in certain circumstances. The terms of these indemnities vary from contract to contract and the amount of indemnification liability, if any, cannot be determined or the likelihood of any liability is considered remote. Consequently, no liability has been recorded on the condensed consolidated statements of financial condition.
	In connection with securities lending transactions, BlackRock has issued certain indemnifications to certain securities lending clients against potential loss resulting from a borrower’s failure to fulfill its obligations under the securities lending agreement should the value of the collateral pledged by the borrower at the time of default be insufficient to cover the borrower’s obligation under the securities lending agreement. At September 30, 2014, the Company indemnified certain of its clients for their securities lending loan balances of approximately $128.1 billion. The Company held as agent, cash and securities totaling $135.4 billion as collateral for indemnified securities on loan at September 30, 2014. The fair value of these indemnifications was not material at September 30, 2014.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	13.  Stock-Based Compensation
	Restricted stock and restricted stock units (“RSUs”) activity for the nine months ended September 30, 2014 is summarized below:
	Outstanding at		Restricted			Weighted-
			Stock and			Average
			RSUs			Grant Date
						Fair Value
	31-Dec-13			4,612,813			$207.94
	Granted			1,379,236			$318.67
	Converted			-2,540,301			$205.26
	Forfeited			-83,302			$238.97
	September 30, 2014(1)			3,368,446			$254.53
	(1)	At September 30, 2014, approximately 3.2 million awards are expected to vest and 0.2 million awards have vested but have not been converted.
	The Company values restricted stock and RSUs at their grant-date fair value as measured by BlackRock’s common stock price. In January 2014, the Company granted 1,022,295 RSUs to employees as part of annual incentive compensation that vest ratably over three years from the date of grant and 287,963 RSUs to employees that cliff vest 100% on January 31, 2017.
	At September 30, 2014, the intrinsic value of outstanding RSUs was $1.1 billion reflecting a stock price of $328.32 at September 30, 2014.
	At September 30, 2014, total unrecognized stock-based compensation expense related to unvested RSUs was $367 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted-average period of 1.1 years.
	Market Performance-based RSUs.
	Market performance-based RSU activity for the nine months ended September 30, 2014 is summarized below:
	Outstanding at		Market			Weighted-
			Performance-			Average
			Based RSUs			Grant Date
						Fair Value
	December 31, 2013			1,132,113			$120.80
	Granted			315,961			$195.30
	Forfeited			-22,755			$121.13
	September 30, 2014(1)			1,425,319		$	137.31
	(1)	At September 30, 2014, approximately 1.4 million awards are expected to vest and an immaterial amount of awards have vested and have not been converted.
	In January 2014, the Company granted 315,961 market performance-based RSUs.
	See Note 14, Stock-Based Compensation, in the 2013 Form 10-K for more information on market performance-based RSUs.
	At September 30, 2014, total unrecognized stock-based compensation expense related to unvested market performance-based awards was $113 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted-average period of 2.2 years.
	Long-Term Incentive Plans Funded by PNC.    Under a share surrender agreement, PNC committed to provide up to 4 million shares of BlackRock stock, held by PNC, to fund certain BlackRock long-term incentive plans (“LTIP”). The current share surrender agreement commits PNC to provide BlackRock series C nonvoting participating preferred stock to fund the remaining committed shares. As of September 30, 2014, 2.7 million shares had been surrendered by PNC.
	At September 30, 2014, the remaining shares committed by PNC of 1.3 million were available to fund certain future long-term incentive awards.
	Stock Options.    Stock option activity for the nine months ended September 30, 2014 is summarized below:
	Outstanding at		Shares Under			Weighted-
			Option			Average
						Exercise
						Price
	December 31, 2013			931,758		$	167.76
	Exercised(1)			(15,032	)	$	167.76
	September 30, 2014(1)			916,726		$	167.76
	(1)	The aggregate intrinsic value of options exercised during the nine months ended September 30, 2014 was $2.1 million. At September 30, 2014, all options were vested.
	The remaining average life of stock options outstanding at September 30, 2014 is approximately two years.

Net_Capital_Requirements

Net Capital Requirements	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Net Capital Requirements	'
	14.  Net Capital Requirements
	The Company is required to maintain net capital in certain regulated subsidiaries within a number of jurisdictions, which is partially maintained by retaining cash and cash equivalent investments in those subsidiaries or jurisdictions. As a result, such subsidiaries of the Company may be restricted in their ability to transfer cash between different jurisdictions and to their parents. Additionally, transfers of cash between international jurisdictions, including repatriation to the United States, may have adverse tax consequences that could discourage such transfers.
	Capital Requirements.    At September 30, 2014, the Company was required to maintain approximately $1.0 billion in net capital in certain regulated subsidiaries, including BlackRock Institutional Trust Company, N.A. (a chartered national bank whose powers are limited to trust activities and which is subject to regulatory capital requirements administered by the Office of the Comptroller of the Currency), entities regulated by the Financial Conduct Authority and Prudential Regulation Authority in the United Kingdom and the Company’s broker-dealers. At such date, the Company was in compliance with all applicable regulatory net capital requirements.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	15.  Accumulated Other Comprehensive Income (Loss)
	Changes in AOCI by component for the three and nine months ended September 30, 2014 were as follows (in millions):
			Unrealized gains			Benefit plans			Foreign			Total(1)
			(losses) on						currency
			available-for-sale						translation
			investments						adjustments
	For the Three Months Ended September 30, 2014
	June 30, 2014		$	5		$	6		($	10	)	$	1
	Other comprehensive income (loss) before reclassifications(2)			(1	)		-			(167	)		(168	)
	Amount reclassified from AOCI(3)			(2	)		-			-			(2	)
	Net other comprehensive income (loss) for the three months ended September 30, 2014			(3	)		-			(167	)		(170	)
	September 30, 2014		$	2		$	6		($	177	)	($	169	)
	For the Nine Months Ended September 30, 2014
	December 31, 2013		$	7		$	6		($	48	)	($	35	)
	Other comprehensive income (loss) before reclassifications(2)			3			-			(129	)		(126	)
	Amount reclassified from AOCI(3)			(8	)		-			-			(8	)
	Net other comprehensive income (loss) for the nine months ended September 30, 2014			(5	)		-			(129	)		(134	)
	September 30, 2014		$	2		$	6		($	177	)	($	169	)
	(1)	All amounts are net of tax.
	(2)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2014.
	(3)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2014. The pre-tax amount reclassified from AOCI was included in net gain (loss) on investments on the condensed consolidated statements of income.
	Changes in AOCI by component for the three and nine months ended September 30, 2013 were as follows (in millions):
			Unrealized gains			Benefit plans			Foreign			Total(1)
			(losses) on						currency
			available-for-sale						translation
			investments						adjustments
	For the Three Months Ended September 30, 2013
	June 30, 2013		$	8		($	4	)	($	202	)	($	198	)
	Other comprehensive income (loss) before reclassifications(2)			2			-			118			120
	Amount reclassified from AOCI(3)			(1	)		-			-			(1	)
	Net other comprehensive income (loss) for the three months ended September 30, 2013			1			-			118			119
	September 30, 2013		$	9		($	4	)	($	84	)	($	79	)
	For the Nine Months Ended September 30, 2013
	December 31, 2012		$	16		($	4	)	($	71	)	($	59	)
	Other comprehensive income (loss) before reclassifications(2)			3			-			(13	)		(10	)
	Amount reclassified from AOCI(3)			(10	)		-			-			(10	)
	Net other comprehensive income (loss) for the nine months ended September 30, 2013			(7	)		-			(13	)		(20	)
	September 30, 2013		$	9		($	4	)	($	84	)	($	79	)
	(1)	All amounts are net of tax.
	(2)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2013.
	(3)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2013. The pre-tax amount reclassified from AOCI was included in net gain (loss) on investments on the condensed consolidated statements of income.

Capital_Stock

Capital Stock	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Capital Stock	'
	16.  Capital Stock
	Nonvoting Participating Preferred Stock.    The Company’s preferred shares authorized, issued and outstanding consisted of the following:
		September 30,		December 31,
		2014		2013
	Series A
	Shares authorized, $0.01 par value		20,000,000		20,000,000
	Shares issued and outstanding		-		-
	Series B
	Shares authorized, $0.01 par value		150,000,000		150,000,000
	Shares issued and outstanding		823,188		823,188
	Series C
	Shares authorized, $0.01 par value		6,000,000		6,000,000
	Shares issued and outstanding		1,311,887		1,311,887
	Series D
	Shares authorized, $0.01 par value		20,000,000		20,000,000
	Shares issued and outstanding		-		-
	Share Repurchase Approvals.    In January 2013, the Board of Directors approved an increase in the availability under the Company’s existing share repurchase program to allow for the repurchase of up to 10.2 million shares of BlackRock common stock. The Company repurchased 2.4 million common shares in open market-transactions under the share repurchase program for approximately $750 million during the nine months ended September 30, 2014. At September 30, 2014, there were 4.1 million shares still authorized to be repurchased.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	17.  Earnings Per Share
	Due to the similarities in terms between BlackRock nonvoting participating preferred stock and the Company’s common stock, the Company considers its participating preferred stock to be a common stock equivalent for purposes of EPS calculations. As such, the Company has included the outstanding nonvoting participating preferred stock in the calculation of average basic and diluted shares outstanding.
	The following table sets forth the computation of basic and diluted EPS for the three and nine months ended September 30, 2014 and 2013 under the treasury stock method:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
	(in millions, except per share data)	2014		2013		2014		2013
	Net income attributable to BlackRock		$917		$730		$2,481		$2,091
	Basic weighted-average shares outstanding		167,933,040		169,811,633		168,571,354		170,581,930
	Dilutive effect of:
	Nonparticipating RSUs and stock options		2,845,726		3,559,875		2,779,922		3,430,946
	Total diluted weighted-average shares outstanding		170,778,766		173,371,508		171,351,276		174,012,876
	Basic earnings per share		$5.46		$4.30		$14.72		$12.26
	Diluted earnings per share		$5.37		$4.21		$14.48		$12.02

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	18.  Income Taxes
	The third quarter of 2014 included a $32 million noncash benefit, primarily associated with the revaluation of certain deferred income tax liabilities related to intangible assets and goodwill as a result of domestic state and local tax changes.
	In addition, the third quarter of 2014 included a $94 million tax benefit, primarily due to the resolution of certain outstanding tax matters related to the acquisition of Barclays Global Investors. In connection with the acquisition, BlackRock recorded a $50 million indemnification asset for unrecognized tax benefits. Due to the resolution of such tax matters in the current quarter, BlackRock recorded $50 million of general and administration expense to reflect the reduction of the indemnification asset and an offsetting $50 million tax benefit.
	The nine months ended September 30, 2014 included a $23 million net noncash expense, primarily associated with the revaluation of certain deferred income tax liabilities related to intangible assets and goodwill arising from the state and local tax effect of changes in the Company’s organizational structure. In addition, the nine months ended September 30, 2014 benefited from an improvement in the geographic mix of earnings and included a $34 million net tax benefit related to several favorable nonrecurring items.
	The three and nine months ended September 30, 2013 included a $64 million net noncash benefit primarily related to the revaluation of certain deferred income tax liabilities related to intangible assets and goodwill, including legislation enacted in the United Kingdom and domestic state and local income tax changes. In addition, the nine months ended September 30, 2013 included the approximately $57 million tax benefit recognized in connection with the Charitable Contribution (see Note 10, Other Assets, for more information) and a tax benefit of approximately $29 million, primarily due to the realization of tax loss carryforwards.

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	19.  Segment Information
	The Company’s management directs BlackRock’s operations as one business, the asset management business. As such, the Company operates in one business segment in accordance with ASC 280-10, Segment Reporting.
	The following table illustrates investment advisory, administration fees, securities lending revenue and performance fees, BlackRock Solutions and advisory revenue, distribution fees and other revenue for the three and nine months ended September 30, 2014 and 2013, respectively.
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
	(in millions)	2014		2013		2014		2013
	Equity	$	1,359	$	1,170	$	4,005	$	3,525
	Fixed income		554		490		1,601		1,488
	Multi-asset		323		266		922		777
	Alternatives		293		248		852		718
	Cash management		72		75		219		244
	Total investment advisory, administration fees, securities lending revenue and performance fees		2,601		2,249		7,599		6,752
	BlackRock Solutions and advisory		165		156		465		420
	Distribution fees		17		19		54		54
	Other revenue		66		48		179		177
	Total revenue	$	2,849	$	2,472	$	8,297	$	7,403
	The following table illustrates total revenue for the three and nine months ended September 30, 2014 and 2013, respectively, by geographic region. These amounts are aggregated on a legal entity basis and do not necessarily reflect where the customer resides.
	(in millions)	Three Months Ended				Nine Months Ended
		September 30,				September 30,
	Revenue	2014		2013		2014		2013
	Americas	$	1,877	$	1,632	$	5,425	$	4,967
	Europe		832		726		2,470		2,060
	Asia-Pacific		140		114		402		376
	Total revenue	$	2,849	$	2,472	$	8,297	$	7,403
	The following table illustrates long-lived assets that consist of goodwill and property and equipment at September 30, 2014 and December 31, 2013 by geographic region. These amounts are aggregated on a legal entity basis and do not necessarily reflect where the asset is physically located.
	(in millions)	September 30,		December 31,
	Long-lived Assets	2014		2013
	Americas	$	13,151	$	13,204
	Europe		198		214
	Asia-Pacific		85		87
	Total long-lived assets	$	13,434	$	13,505
	Americas primarily is comprised of the United States, Canada, Brazil, Chile and Mexico, while Europe primarily is comprised of the United Kingdom. Asia-Pacific is comprised of Japan, Australia, Singapore, Hong Kong, Taiwan, Korea, India, Malaysia and China.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	20.  Subsequent Events
	The Company conducted a review for subsequent events and determined that no subsequent events had occurred that would require accrual or disclosure.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation.    These condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and include the accounts of the Company and its controlled subsidiaries. Noncontrolling interests on the condensed consolidated statements of financial condition represents the portion of consolidated sponsored investment funds in which the Company does not have direct equity ownership. Accounts and transactions between consolidated entities have been eliminated.
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting periods. Actual results could differ from those estimates.
	Certain financial information that is normally included in annual financial statements, including certain financial statement footnotes, is not required for interim reporting purposes and has been condensed or omitted herein. These condensed consolidated financial statements should be read in conjunction with the Company’s consolidated financial statements and notes related thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission (“SEC”) on February 28, 2014 (“2013 Form 10-K”).
	The interim financial information at September 30, 2014 and for the three and nine months ended September 30, 2014 and 2013 is unaudited. However, in the opinion of management, the interim information includes all normal recurring adjustments necessary for the fair presentation of the Company’s results for the periods presented. The results of operations for interim periods are not necessarily indicative of results to be expected for the full year.
Fair Value Measurements	'
	Fair Value Measurements.
	Hierarchy of Fair Value Inputs.    The provisions of Accounting Standards Codification (“ASC”) 820, Fair Value Measurement (“ASC 820”), establish a hierarchy that prioritizes inputs to valuation techniques used to measure fair value and require companies to disclose the fair value of their financial instruments according to the fair value hierarchy (i.e., Level 1, 2 and 3 inputs, as defined). The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.
	Assets and liabilities measured and reported at fair value are classified and disclosed in one of the following categories:
	Level 1 Inputs:
	Quoted prices (unadjusted) in active markets for identical assets or liabilities at the reporting date.
		•	Level 1 assets may include listed mutual funds (including those accounted for under the equity method of accounting as these mutual funds are investment companies that have publicly available net asset values (“NAVs”), which in accordance with GAAP, are calculated under fair value measures and the changes in fair values are equal to the earnings of such funds), ETFs, listed equities and certain exchange-traded derivatives.
	Level 2 Inputs:
	Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities that are not active; quotes from pricing services or brokers for which the Company can determine that orderly transactions took place at the quoted price or that the inputs used to arrive at the price are observable; and inputs other than quoted prices that are observable, such as models or other valuation methodologies. As a practical expedient, the Company uses the NAV (or its equivalent) of certain investments as their fair value.
		•	Level 2 assets may include debt securities, bank loans, short-term floating-rate notes, asset-backed securities, securities held within consolidated hedge funds, certain equity method limited partnership interests in hedge funds valued based on NAV (or its equivalent) where the Company has the ability to redeem at the measurement date or within the near term without redemption restrictions, restricted public securities valued at a discount, as well as over-the-counter derivatives, including interest and inflation rate swaps and foreign currency exchange contracts that have inputs to the valuations that generally can be corroborated by observable market data.
	Level 3 Inputs:
	Unobservable inputs for the valuation of the asset or liability, which may include nonbinding broker quotes. Level 3 assets include investments for which there is little, if any, market activity. These inputs require significant management judgment or estimation. Certain investments that are valued using a NAV (or its equivalent) and are subject to current redemption restrictions that will not be lifted in the near term are included in Level 3.
		•	Level 3 assets may include general and limited partnership interests in private equity funds, funds of private equity funds, real estate funds, hedge funds, funds of hedge funds, direct private equity investments held within consolidated funds, bank loans and bonds.
		•	Level 3 liabilities include borrowings of consolidated collateralized loan obligations (“CLOs”) valued based upon nonbinding single-broker quotes.
		•	Level 3 inputs include BlackRock capital accounts for its partnership interests in various alternative investments, including distressed credit hedge funds, opportunistic funds, real estate and private equity funds, which may be adjusted by using the returns of certain market indices.
Significance of Inputs	'
	Significance of Inputs.    The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the financial instrument.
Valuation Techniques	'
	Valuation Techniques. The fair values of certain Level 3 assets and liabilities were determined using various methodologies as appropriate, including NAVs of underlying investments, third-party pricing vendors, broker quotes and market and income approaches. Such quotes and modeled prices are evaluated for reasonableness through various procedures, including due diligence reviews of third-party pricing vendors, variance analyses, consideration of the current market environment and other analytical procedures.
	As a practical expedient, the Company uses NAV as the fair value for certain investments. The inputs to value these investments may include BlackRock capital accounts for its partnership interests in various alternative investments, including distressed credit hedge funds, opportunistic funds, real estate and private equity funds, which may be adjusted by using the returns of certain market indices. The various partnerships generally are investment companies, which record their underlying investments at fair value based on fair value policies established by management of the underlying fund. Fair value policies at the underlying fund generally require the fund to utilize pricing/valuation information from third-party sources, including independent appraisals. However, in some instances, current valuation information for illiquid securities or securities in markets that are not active may not be available from any third-party source or fund management may conclude that the valuations that are available from third-party sources are not reliable. In these instances, fund management may perform model-based analytical valuations that may be used as an input to value these investments.
	A significant number of inputs used to value equity, debt securities and bank loans is sourced from third-party pricing vendors. Generally, prices obtained from pricing vendors are categorized as Level 1 inputs for identical securities traded in active markets and as Level 2 for other similar securities if the vendor uses observable inputs in determining the price. Annually, BlackRock’s internal valuation committee or other designated groups review both the valuation methodologies, including the general assumptions and methods used to value various asset classes, and operational processes with these vendors. On a quarterly basis, meetings are held with key vendors to identify any significant changes to the vendors’ processes.
	In addition, quotes obtained from brokers generally are nonbinding and categorized as Level 3 inputs. However, if the Company is able to determine that market participants have transacted for the asset in an orderly manner near the quoted price or if the Company can determine that the inputs used by the broker are observable, the quote is classified as a Level 2 input.
Fair Value Option	'
	Fair Value Option.    ASC 825-10, Financial Instruments (“ASC 825-10”), provides a fair value option election that allows companies an irrevocable election to use fair value as the initial and subsequent accounting measurement attribute for certain financial assets and liabilities. ASC 825-10 permits entities to elect to measure eligible financial assets and liabilities at fair value on an ongoing basis. Unrealized gains and losses on items for which the fair value option has been elected are reported in earnings. The decision to elect the fair value option is determined on an instrument-by-instrument basis, which must be applied to an entire instrument, and not only specified risks, specific cash flows, or portions of that instrument, and is irrevocable once elected. Assets and liabilities measured at fair value pursuant to ASC 825-10 are required to be reported separately from those instruments measured using another accounting method.
	The Company applies the fair value option provisions for eligible assets and liabilities, including bank loans and borrowings, held by consolidated CLOs to mitigate accounting mismatches between the carrying value of the assets and liabilities and to achieve operational simplification. To the extent there is a difference between the change in fair value of the assets and liabilities, the difference is reflected as net income (loss) attributable to nonredeemable noncontrolling interests on the condensed consolidated statements of income and offset by a change in appropriated retained earnings on the condensed consolidated statements of financial condition.
Derivative Instruments and Hedging Activities	'
	Derivative Instruments and Hedging Activities.    ASC 815-10, Derivatives and Hedging (“ASC 815-10”), establishes accounting and reporting standards for derivative instruments, including certain derivatives embedded in other contracts and for hedging activities. ASC 815-10 generally requires an entity to recognize all derivatives as either assets or liabilities on the condensed consolidated statements of financial condition and to measure those investments at fair value.
	The Company does not use derivative financial instruments for trading or speculative purposes. The Company may use derivative financial instruments primarily for purposes of hedging: (i) exposures to fluctuations in foreign currency exchange rates of certain assets and liabilities, (ii) market exposures for certain seed investments and (iii) future cash flows on floating-rate notes. The Company may also use derivatives within its separate account assets, which are segregated funds held for purposes of funding individual and group pension contracts. In addition, certain consolidated sponsored investment funds may also invest in derivatives as a part of their investment strategy.
	Changes in the fair value of the Company’s derivative financial instruments are generally recognized in earnings and, where applicable, are offset by the corresponding gain or loss on the related foreign-denominated assets or liabilities or hedged investments, on the condensed consolidated statements of income.
Separate Account Assets and Liabilities	'
	Separate Account Assets and Liabilities.    Separate account assets are maintained by BlackRock Life Limited, a wholly owned subsidiary of the Company, which is a registered life insurance company in the United Kingdom, and represent segregated assets held for purposes of funding individual and group pension contracts. The life insurance company does not underwrite any insurance contracts that involve any insurance risk transfer from the insured to the life insurance company. The separate account assets primarily include equity securities, debt securities, money market funds and derivatives. The separate account assets are not subject to general claims of the creditors of BlackRock. These separate account assets and the related equal and offsetting liabilities are recorded as separate account assets and separate account liabilities on the condensed consolidated statements of financial condition in accordance with ASC 944-80, Financial Services – Separate Accounts.
	The net investment income attributable to separate account assets supporting individual and group pension contracts accrues directly to the contract owner and is not reported on the condensed consolidated statements of income. While BlackRock has no economic interest in these separate account assets and liabilities, BlackRock earns policy administration and management fees associated with these products, which are included in investment advisory, administration fees and securities lending revenue on the condensed consolidated statements of income.
Separate Account Collateral Assets Held and Liabilities Under Securities Lending Agreements	'
	Separate Account Collateral Assets Held and Liabilities Under Securities Lending Agreements.    The Company facilitates securities lending arrangements whereby securities held by separate account assets maintained by BlackRock Life Limited are lent to third parties under global master securities lending agreements. In exchange, the Company receives collateral with minimum values generally ranging from approximately 102% to 112% of the value of the securities lent in order to reduce counterparty risk. The required collateral value is calculated on a daily basis. The global master securities lending agreements provide the Company the right to request additional collateral or, in the event of borrower default, the right to liquidate collateral. Under the Company’s securities lending arrangements, the Company can resell or repledge the collateral and the borrower can resell or repledge the loaned securities. The securities lending transactions entered into by the Company are accompanied by an agreement that entitles the Company to request the borrower to return the securities at any time; therefore, these transactions are not reported as sales under ASC 860, Transfers and Servicing.
	As a result of the Company’s ability to resell or repledge the collateral, the Company records on the condensed consolidated statements of financial condition the cash and noncash collateral received under these arrangements as its own asset in addition to an equal and offsetting collateral liability for the obligation to return the collateral. During the nine months ended September 30, 2014 and 2013, the Company had not resold or repledged any of the collateral received under these arrangements. At September 30, 2014 and December 31, 2013, the fair value of loaned securities held by separate account assets was approximately $19.1 billion and $19.7 billion, respectively, and the fair value of the collateral held under these securities lending agreements was approximately $21.0 billion and $21.8 billion, respectively.
Appropriated Retained Earnings	'
	Appropriated Retained Earnings.    Upon the consolidation of CLOs, BlackRock records an adjustment to appropriated retained earnings on the condensed consolidated statements of financial condition equal to the difference between the fair value of the CLOs’ assets and the fair value of their liabilities. Such amounts are recorded as appropriated retained earnings as the CLO noteholders ultimately will receive the benefits or absorb the losses associated with the CLOs’ assets and liabilities. The net change in the fair value of the CLOs’ assets and liabilities is recorded as net income (loss) attributable to nonredeemable noncontrolling interests and as a change to appropriated retained earnings.
Accounting Pronouncements Adopted in the Nine Months Ended September 30, 2014	'
	Accounting Pronouncements Adopted in the Nine Months Ended September 30, 2014
	Cumulative Translation Adjustment.    In March 2013, the FASB issued ASU 2013-05, Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (“ASU 2013-05”). ASU 2013-05 addresses the accounting for the cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The adoption of ASU 2013-05 on January 1, 2014 was not material to the condensed consolidated financial statements.
	Investment Company Guidance.    In June 2013, the FASB issued ASU 2013-08, Financial Services – Investment Companies: Amendments to the Scope, Measurement, and Disclosure Requirements (“ASU 2013-08”). ASU 2013-08 amends the current criteria for an entity to qualify as an investment company, creates new disclosure requirements and amends the measurement criteria for certain interests in other investment companies. The adoption of ASU 2013-08 on January 1, 2014 was not material to the condensed consolidated financial statements.
	Presentation of an Unrecognized Tax Benefit.    In July 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The adoption of ASU 2013-11 on January 1, 2014 was not material to the condensed consolidated financial statements.
Recent Accounting Pronouncements Not Yet Adopted	'
	Recent Accounting Pronouncements Not Yet Adopted
	Revenue from Contracts with Customers.    In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The Company is currently evaluating the impact of adopting ASU 2014-09, which is effective for the Company on January 1, 2017.
	Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity.    In August 2014, the FASB issued ASU 2014-13, Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity (“ASU 2014-13”). ASU 2014-13 provides an entity that consolidates a collateralized financing entity (“CFE”) that had elected the fair value option for the financial assets and financial liabilities of such CFE an alternative to current fair value measurement guidance. If elected, the Company could measure both the financial assets and the financial liabilities of the CFE by using the more observable of the fair value of the financial assets and the fair value of the financial liabilities. The election would effectively eliminate any measurement difference previously recorded as net income (loss) attributable to nonredeemable noncontrolling interests and as an adjustment to appropriated retained earnings. ASU 2014-13 is effective for the Company on January 1, 2016, with retrospective or modified retrospective approach required. The Company currently expects to early adopt ASU 2014-13 and does not expect the adoption to be material to the consolidated financial statements.

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Summary of Carrying Value of Total Investments	'
	A summary of the carrying value of total investments is as follows:
	(in millions)		September 30,				December 31,
			2014				2013
	Available-for-sale investments			$221				$183
	Held-to-maturity investments			64				83
	Trading investments:
	Consolidated sponsored investment funds			396				385
	Other equity and debt securities			18				43
	Deferred compensation plan mutual funds			63				58
	Total trading investments			477				486
	Other investments:
	Consolidated sponsored investment funds			288				441
	Equity method investments			658				697
	Deferred compensation plan hedge fund equity method investments			21				39
	Cost method investments(1)			96				119
	Carried interest			126				103
	Total other investments			1,189				1,399
	Total investments			$1,951				$2,151
	-1	Amounts primarily include Federal Reserve Bank Stock.
Summary of Cost and Carrying Value of Investments Classified as Available-for-Sale Investments	'
	A summary of the cost and carrying value of investments classified as available-for-sale investments is as follows:
	(in millions)
							Gross Unrealized						Carrying
	September 30, 2014		Cost				Gains				Losses		Value
	Equity securities of sponsored investment funds			$222				$7				($8)		$221
	December 31, 2013
	Equity securities of sponsored investment funds			$180				$4				($4)		$180
	Other securities			1				2				-		3
	Total available-for-sale investments			$181				$6				($4)		$183
Summary of Cost and Carrying Value of Trading Investments	'
	A summary of the cost and carrying value of trading investments is as follows:
	(in millions)		September 30, 2014						December 31, 2013
			Cost		Carrying				Cost		Carrying
					Value						Value
	Trading investments:
	Deferred compensation plan mutual funds			$  48		$  63				$  49		$  58
	Equity securities/multi-asset mutual funds			195		212				174		184
	Debt securities/fixed income mutual funds:
	Corporate debt			87		88				128		128
	Government debt			97		101				121		116
	Asset/mortgage backed debt			13		13				-		-
	Total trading investments			$440		$477				$472		$486
Summary of Cost and Carrying Value of Other Investments	'
	A summary of the cost and carrying value of other investments is as follows:
	(in millions)		September 30, 2014						December 31, 2013
			Cost		Carrying				Cost		Carrying
					Value						Value
	Other investments:
	Consolidated sponsored investment funds			$274		$288				$420		$441
	Equity method			559		658				613		697
	Deferred compensation plan equity method investments			22		21				37		39
	Cost method investments:
	Federal Reserve Bank stock			91		91				90		90
	Other			5		5				17		29
	Total cost method investments			96		96				107		119
	Carried interest			-		126				-		103
	Total other investments			$951		$1,189				$1,177		$1,399

Consolidated_Sponsored_Investm1

Consolidated Sponsored Investment Funds (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Consolidated Sponsored Investment Funds Included in Condensed Consolidated Statements of Financial Condition	'
	The following table presents the balances related to these consolidated funds that were included on the condensed consolidated statements of financial condition as well as BlackRock’s net interest in these funds:
	(in millions)	September 30,			December 31,
		2014			2013
	Cash and cash equivalents		$  127			$114
	Investments:
	Trading investments		396			385
	Other investments		288			441
	Other assets		17			20
	Other liabilities		(11	)		(39	)
	Noncontrolling interests		(163	)		(189	)
	BlackRock’s net interests in consolidated sponsored investment funds		$654			$732

Fair_Value_Disclosures_Tables

Fair Value Disclosures (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	Assets and liabilities measured at fair value on a recurring basis and other assets not held at fair value
	September 30, 2014		Quoted			Significant Other			Significant			Other Assets			September 30,
	(in millions)		Prices in			Observable Inputs			Unobservable			Not Held at Fair			2014
			Active			(Level 2)			Inputs			Value(1)
			Markets for						(Level 3)
			Identical
			Assets
			(Level 1)
	Assets:
	Investments
	Available-for-sale:
	Equity securities of sponsored investment funds		$	218		$	3		$	-		$	-		$	221
	Held-to-maturity debt securities			-			-			-			64			64
	Trading:
	Deferred compensation plan mutual funds			63			-			-			-			63
	Equity/Multi-asset mutual funds			212			-			-			-			212
	Debt securities / fixed income mutual funds			10			192			-			-			202
	Total trading			285			192			-			-			477
	Other investments:
	Consolidated sponsored investment funds:
	Private / public equity(2)			6			21			258			-			285
	Hedge funds / Funds of funds			-			-			3			-			3
	Total consolidated sponsored investment funds			6			21			261			-			288
	Equity method:
	Hedge funds / Funds of hedge funds			-			241			73			5			319
	Private equity investments			-			-			104			-			104
	Real estate funds			-			21			92			8			121
	Fixed income mutual funds			19			-			-			-			19
	Other			95			-			-			-			95
	Total equity method			114			262			269			13			658
	Deferred compensation plan equity method investments			-			-			21			-			21
	Cost method investments			-			-			-			96			96
	Carried interest			-			-			-			126			126
	Total investments			623			478			551			299			1,951
	Separate account assets			111,222			44,460			-			797			156,479
	Separate account collateral held under securities lending agreements:
	Equity securities			17,197			-			-			-			17,197
	Debt securities			-			3,769			-			-			3,769
	Total separate account collateral held under securities lending agreements			17,197			3,769			-			-			20,966
	Assets of consolidated VIEs:
	Bank loans and other assets			-			2,546			204			65			2,815
	Bonds			-			33			17			-			50
	Private / public equity(3)			2			5			11			-			18
	Total assets of consolidated VIEs			2			2,584			232			65			2,883
	Total		$	129,044		$	51,291		$	783			1,161		$	182,279
	Liabilities:
	Borrowings of consolidated VIEs		$	-		$	-		$	2,889		$	-		$	2,889
	Separate account collateral liabilities under securities lending agreements			17,197			3,769			-			-			20,966
	Other liabilities(4)			-			5			39			-			44
	Total		$	17,197		$	3,774		$	2,928		$	-		$	23,899
		(1)	Amounts are comprised of investments held at cost or amortized cost, carried interest and certain equity method investments, which include sponsored investment funds and other assets, which in accordance with GAAP are not accounted for under a fair value measure. In accordance with GAAP, certain equity method investees do not account for both their financial assets and liabilities under fair value measures; therefore, the Company’s investment in such equity method investees may not represent fair value.
		(2)	Level 3 amounts include $181 million and $77 million of underlying third-party private equity funds and direct investments in private equity companies held by private equity funds, respectively.
		(3)	Level 3 amounts include $11 million of underlying third-party private equity funds held by a consolidated private equity fund of fund.
		(4)	Amounts include a derivative (see Note 7, Derivatives and Hedging, for more information) and contingent liabilities related to the acquisitions of the Credit Suisse ETF franchise and MGPA (see Note 12, Commitments and Contingencies, for more information).
	Assets and liabilities measured at fair value on a recurring basis and other assets not held at fair value
	December 31, 2013		Quoted			Significant			Significant			Other Assets			December 31,
	(in millions)		Prices in			Other			Unobservable			Not Held at			2013
			Active			Observable			Inputs			Fair Value(1)
			Markets for			Inputs			(Level 3)
			Identical			(Level 2)
			Assets
			(Level 1)
	Assets:
Investments
Available-for-sale:
Equity securities of sponsored investment funds		$	180		$	-		$	-		$	-		$	180
Other securities			-			3			-			-			3
Total available-for-sale			180			3			-			-			183
Held-to-maturity debt securities			-			-			-			83			83
Trading:
Deferred compensation plan mutual funds			58			-			-			-			58
Equity/Multi-asset mutual funds			184			-			-			-			184
Debt securities / fixed income mutual funds			31			213			-			-			244
Total trading			273			213			-			-			486
Other investments:
Consolidated sponsored investment funds:
Hedge funds / Funds of funds			-			135			24			-			159
Private / public equity(2)			5			13			223			41			282
Total consolidated sponsored investment funds			5			148			247			41			441
Equity method:
Hedge funds / Funds of hedge funds			-			177			99			63			339
Private equity investments			-			-			101			-			101
Real estate funds			-			20			98			7			125
Fixed income mutual funds			113			-			-			-			113
Equity/Multi-asset, alternative mutual funds			19			-			-			-			19
Total equity method			132			197			298			70			697
Deferred compensation plan equity method investments			-			10			29			-			39
Cost method investments			-			-			-			119			119
Carried interest			-			-			-			103			103
Total investments			590			571			574			416			2,151
Separate account assets			113,382			40,841			-			890			155,113
Separate account collateral held under securities lending agreements:
Equity securities			20,856			-			-			-			20,856
Debt securities			-			932			-			-			932
Total separate account collateral held under securities lending agreements			20,856			932			-			-			21,788
Other assets(3)			-			39			-			-			39
Assets of consolidated VIEs:
Bank loans and other assets			-			2,047			129			19			2,195
Bonds			-			71			35			-			106
Private / public equity(4)			-			10			14			-			24
Total assets of consolidated VIEs			-			2,128			178			19			2,325
Total		$	134,828		$	44,511		$	752		$	1,325		$	181,416
Liabilities:
Borrowings of consolidated VIEs		$	-		$	-		$	2,369		$	-		$	2,369
Separate account collateral liabilities under securities lending agreements			20,856			932			-			-			21,788
Other liabilities(5)			18			4			42			-			64
Total		$	20,874		$	936		$	2,411		$	-		$	24,221
	(1)	Amounts are comprised of investments held at cost or amortized cost, carried interest and certain equity method investments, which include sponsored investment funds and other assets, which in accordance with GAAP are not accounted for under a fair value measure. In accordance with GAAP, certain equity method investees do not account for both their financial assets and liabilities under fair value measures; therefore, the Company’s investment in such equity method investees may not represent fair value.
	(2)	Level 3 amounts include $195 million and $28 million of underlying third-party private equity funds and direct investments in private equity companies held by private equity funds, respectively.
	(3)	Amount includes company-owned and split-dollar life insurance policies and unrealized gains on forward foreign currency exchange contracts.
	(4)	Level 3 amounts include $14 million of underlying third-party private equity funds held by a sponsored private equity fund of fund.
	(5)	Amounts include a derivative (see Note 7, Derivatives and Hedging, for more information), securities sold short within consolidated sponsored investment funds and contingent liabilities related to the acquisitions of the Credit Suisse ETF franchise and MGPA (see Note 12, Commitments and Contingencies, for more information).
Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended September 30, 2014
	(in millions)		June 30,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
			2014			and						maturities			other			into			out of			2014		unrealized
						unrealized									settlements(1)			Level 3			Level 3					gains (losses)
						gains																				included in
						(losses) in																				earnings(2)
						earnings
						and OCI
	Assets:
	Investments
	Consolidated sponsored investment funds:
	Hedge funds / Funds of funds			$5			$-			$-			($2	)		$-			$-			$-			$3		$1
	Private equity			272			1			12			(26	)		(1	)		-			-			258		(3	)
	Equity method:
	Hedge funds / Funds of hedge funds			84			2			5			(4	)		(14	)		-			-			73		-
	Private equity investments			106			1			4			-			(7	)		-			-			104		2
	Real estate funds			96			3			1			(2	)		(6	)		-			-			92		1
	Deferred compensation plan equity method investments			27			(3	)		-			-			(3	)		-			-			21		(2	)
	Total Level 3 investments			590			4			22			(34	)		(31	)		-			-			551		(1	)
	Assets of consolidated VIEs:
	Bank loans			153			(3	)		63			(36	)		-			87			(60	)		204
	Bonds			25			-			-			(8	)		-			-			-			17
	Private equity			13			-			-			(2	)		-			-			-			11
	Total Level 3 assets of consolidated VIEs			191			(3	)		63			(46	)		-			87			(60	)		232		n/a	(3)
	Total Level 3 assets			$781			$1			$85			($80	)		($31	)		$87			($60	)		$783
	Liabilities:
	Borrowings of consolidated VIEs			$2,699			$26			$-			$-			$216			$-			$-			$2,889		n/a	(3)
	Other liabilities			43			-			-			-			(4	)		-			-			39		-
	Total Level 3 liabilities			$2,742			$26			$-			$-			$212			$-			$-			$2,928
		n/a	– not applicable
		(1)	Amount primarily includes distributions from equity method investees and net proceeds from (repayments of) borrowings by consolidated VIEs.
		(2)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
		(3)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
	Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Nine Months Ended September 30, 2014
	(in millions)		December 31,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
			2013			and						maturities			other			into			out of			2014		unrealized
						unrealized									settlements(1)			Level 3			Level 3					gains (losses)
						gains																				included in
						(losses) in																				earnings(3)
						earnings
						and OCI
	Assets:
	Investments
	Consolidated sponsored investment funds:
	Hedge funds / Funds of funds			$24			$-			$-			($20	)		($1	)		$-			$-			$3		$-
	Private equity			223			14			37			(56	)		(1	)		41	(2)		-			258		9
	Equity method:
	Hedge funds / Funds of hedge funds			99			6			13			(11	)		(34	)		-			-			73		4
	Private equity investments			101			10			11			-			(18	)		-			-			104		11
	Real estate funds			98			12			5			(5	)		(18	)		-			-			92		10
	Deferred compensation plan equity method investments			29			(1	)		-			-			(7	)		-			-			21		-
	Total Level 3 investments			574			41			66			(92	)		(79	)		41			-			551		34
	Assets of consolidated VIEs:
	Bank loans			129			(3	)		155			(79	)		-			196			(194	)		204
	Bonds			35			-			-			(18	)		-			-			-			17
	Private equity			14			1			-			(4	)		-			-			-			11
	Total Level 3 assets of consolidated VIEs			178			(2	)		155			(101	)		-			196			(194	)		232		n/a	(4)
	Total Level 3 assets			$752			$39			$221			($193	)		($79	)		$237			($194	)		$783
	Liabilities:
	Borrowings of consolidated VIEs			$2,369			$40			$-			$-			$560			$-			$-			$2,889		n/a	(4)
	Other liabilities			42			(1	)		-			-			(4	)		-			-			39		-
	Total Level 3 liabilities			$2,411			$39			$-			$-			$556			$-			$-			$2,928
		n/a	– not applicable
	(1)	Amount primarily includes distributions from equity method investees and net proceeds from (repayments of) borrowings by consolidated VIEs.
	(2)	Includes investments previously held at cost.
	(3)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(4)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended September 30, 2013
(in millions)		June 30,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
		2013			and						maturities			other			into			out of			2013		gains (losses)
					unrealized									settlements(1)			Level 3			Level 3					included in
					gains																				earnings(2)
					(losses) in
					earnings
					and OCI
Assets:
Investments
Available-for-sale:
Equity securities (CDOs)			$1			$-			$-			$-			$-			$-			$-			$1		$-
Consolidated sponsored investment funds:
Hedge funds / Funds of funds			47			2			-			(2	)		(2	)		-			-			45		-
Private equity			249			10			-			(23	)		-			-			(2	)		234		7
Equity method:
Hedge funds / Funds of hedge funds			157			1			1			(1	)		(13	)		-			-			145		1
Private equity investments			105			4			1			(10	)		(2	)		-			-			98		4
Real estate funds			97			6			2			-			(2	)		-			-			103		6
Total Level 3 investments			656			23			4			(36	)		(19	)		-			(2	)		626		18
Assets of consolidated VIEs:
Bank loans			93			-			18			(8	)		-			40			(46	)		97
Bonds			35			1			-			(1	)		-			-			-			35
Private equity			19			-			-			(2	)		-			-			-			17
Total Level 3 assets of consolidated VIEs			147			1			18			(11	)		-			40			(46	)		149		n/a	(3)
Total Level 3 assets			$803			$24			$22			($47	)		($19	)		$40			($48	)		$775
Liabilities:
Borrowings of consolidated VIEs			$2,145			($5	)		$-			$-			($82	)		$-			$-			$2,068		n/a	(3)
Other liabilities			-			-			-			-			33			-			-			33
Total Level 3 liabilities			$2,145			($5	)		$-			$-			($49	)		$-			$-			$2,101
	n/a	– not applicable
	(1)	Amounts primarily include distributions from equity method investees, repayments of borrowings of consolidated VIEs and a contingent liability related to the acquisition of Credit Suisse’s ETF franchise.
	(2)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(3)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Nine Months Ended September 30, 2013
(in millions)		December 31,			Realized			Purchases			Sales and			Issuances  and			Transfers			Transfers			September 30,		Total net
		2012			and						maturities			other			into			out of			2013		gains
					unrealized									settlements(1)			Level 3			Level 3					(losses)
					gains																				included in
					(losses) in																				earnings(2)
					earnings
					and OCI
Assets:
Investments
Available-for-sale:
Equity securities (CDOs)			$1			$-			$-			$-			$-			$-			$-			$1		$-
Consolidated sponsored investment funds:
Hedge funds / Funds of hedge funds			73			8			12			(11	)		(30	)		-			(7	)		45		6
Private equity			266			26			12			(62	)		-			-			(8	)		234		21
Equity method:
Hedge funds / Funds of hedge funds			161			10			2			(1	)		(27	)		-			-			145		10
Private equity investments			90			14			10			(10	)		(6	)		-			-			98		14
Real estate funds			88			14			5			-			(4	)		-			-			103		14
Total Level 3 investments			679			72			41			(84	)		(67	)		-			(15	)		626		65
Separate account assets			2			-			-			(2	)		-			-			-			-		n/a	(3)
Assets of consolidated VIEs:
Bank loans			106			(1	)		91			(48	)		-			71			(122	)		97
Bonds			46			-			4			(15	)		-			-			-			35
Private equity			22			1			-			(6	)		-			-			-			17
Fund of hedge funds			-			-			134			-			(134	)		-			-			-
Total Level 3 assets of consolidated VIEs			174			-			229			(69	)		(134	)		71			(122	)		149		n/a	(4)
Total Level 3 assets			$855			$72			$270			($155	)		($201	)		$71			($137	)		$775
Liabilities:
Borrowings of consolidated VIEs			$2,402			($9	)		$-			$-			($343	)		$-			$-			$2,068		n/a	(4)
Other liabilities			-			-			-			-			33			-			-			33
Total Level 3 liabilities			$2,402			($9	)		$-			$-			($310	)		$-			$-			$2,101
	n/a	– not applicable
	(1)	Amounts primarily include distributions from equity method investees, repayments of borrowings of consolidated VIEs, elimination of investment related to a deconsolidation of a consolidated VIE, a reclassification of an investment from a consolidated sponsored investment fund to an equity method investment due to a change in ownership percentage and a contingent liability related to the acquisition of Credit Suisse’s ETF franchise.
	(2)	Earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date.
	(3)	The net investment income attributable to separate account assets accrues directly to the contract owners and is not reported on the condensed consolidated statements of income.
	(4)	The net gain (loss) on consolidated VIEs is solely attributable to noncontrolling interests on the condensed consolidated statements of income.
Fair Value of Financial Assets and Financial Liabilities	'
	Disclosures of Fair Value for Financial Instruments Not Held at Fair Value.    At September 30, 2014 and December 31, 2013, the fair value of the Company’s financial instruments not held at fair value are categorized in the table below:
			September 30, 2014						December 31, 2013
	(in millions)		Carrying			Estimated			Carrying			Estimated			Fair Value
			Amount			Fair Value			Amount			Fair Value			Hierarchy
	Financial Assets:
	Cash and cash equivalents		$	6,149		$	6,149		$	4,390		$	4,390			Level 1	(1)(2)
	Accounts receivable			2,631			2,631			2,247			2,247			Level 1	(3)
	Cash and cash equivalents of consolidated VIEs			175			175			161			161			Level 1	(1)
	Financial Liabilities:
	Accounts payable and accrued liabilities			1,576			1,576			1,084			1,084			Level 1	(3)
	Long-term borrowings			5,937			6,295			4,939			5,284			Level 2	(4)
		(1)	Cash and cash equivalents are carried at either cost or amortized cost, which approximates fair value due to their short-term maturities.
		(2)	At September 30, 2014 and December 31, 2013, approximately $94 million and $64 million, respectively, of money market funds were recorded within cash and cash equivalents on the condensed consolidated statements of financial condition. Money market funds are valued based on quoted market prices, or $1.00 per share, which generally is the NAV of the fund. At September 30, 2014 and December 31, 2013, approximately $127 million and $114 million, respectively, related to cash and cash equivalents held by consolidated sponsored investment funds.
		(3)	The carrying amounts of accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term nature.
		(4)	Long-term borrowings are recorded at amortized cost. The fair value of the long-term borrowings, including the current portion of long-term borrowings, is estimated using market prices at the end of September 2014 and December 2013, respectively. See Note 11, Borrowings, for the fair value of each of the Company’s long-term borrowings.
Investments in Certain Entities Calculate Net Asset Value per Share	'
	The following tables list information regarding all investments that use a fair value measurement to account for both their financial assets and financial liabilities in their calculation of a NAV per share (or its equivalent).
	September 30, 2014
	(in millions)		Ref			Fair Value			Total Unfunded		Redemption	Redemption
									Commitments		Frequency	Notice Period
	Consolidated sponsored investment funds:
	Private equity funds/funds of funds			(a	)		$181		$  24		n/r	n/r
	Other funds of hedge funds			(b	)		2		-		Quarterly(100%)	60 –
												90 days
	Equity method:(1)
	Hedge funds/funds of hedge funds			(c	)		314		43		Monthly(31%)	15 –
												90 days
											Quarterly(47%)
											n/r(22%)
	Private equity funds			(d	)		104		67		n/r	n/r
	Real estate funds			(e	)		113		9		Quarterly(19%)	60 days
											n/r(81%)
	Deferred compensation plan investments			(f	)		21		5		n/r	n/r
	Consolidated VIEs:
	Private equity fund			(g	)		11		1		n/r	n/r
	Total						$746		$149
	December 31, 2013
	(in millions)		Ref			Fair Value			Total		Redemption	Redemption
									Unfunded		Frequency	Notice Period
									Commitments
	Consolidated sponsored investment funds:
	Private equity funds of funds			(a	)		$195		$23		n/r	n/r
	Other funds of hedge funds			(b	)		155		-		Monthly(13%)	30 – 90 days
											Quarterly(78%)
											n/r(9%)
	Equity method:(1)
	Hedge funds/funds of hedge funds			(c	)		276		84		Monthly(55%)	15 – 90 days
											Quarterly(11%)
											n/r(34%)
	Private equity funds			(d	)		101		62		n/r	n/r
	Real estate funds			(e	)		118		12		Quarterly(17%)	60 days
											n/r(83%)
	Deferred compensation plan investments			(f	)		39		7		Monthly(8%)	60 – 90 days
											Quarterly(18%)
											n/r(74%)
	Consolidated VIEs:
	Private equity fund			(g	)		14		1		n/r	n/r
	Total						$898		$189
		n/r	– not redeemable
		(1)	Comprised of equity method investments, which include investment companies, which account for their financial assets and most financial liabilities under fair value measures; therefore, the Company’s investment in such equity method investees approximates fair value.
		(a)	This category includes the underlying third-party private equity funds within consolidated BlackRock sponsored private equity funds of funds. The fair values of the investments in the third-party funds have been estimated using capital accounts representing the Company’s ownership interest in each fund in the portfolio as well as other performance inputs. These investments are not subject to redemption; however, for certain funds, the Company may sell or transfer its interest, which may need approval by the general partner of the underlying funds. Due to the nature of the investments in this category, the Company reduces its investment by distributions that are received through the realization of the underlying assets of the funds. It is estimated that the underlying assets of these funds will be liquidated over a weighted-average period of approximately six years and seven years at September 30, 2014 and December 31, 2013. The total remaining unfunded commitments to other third-party funds were $24 million and $23 million at September 30, 2014 and December 31, 2013, respectively. The Company had contractual obligations to the consolidated funds of $33 million and $30 million at September 30, 2014 and December 31, 2013, respectively.
		(b)	This category includes consolidated funds of hedge funds that invest in multiple strategies to diversify risks. The fair values of the investments have been estimated using the NAV of the fund’s ownership interest in partners’ capital of each fund in the portfolio. Certain of the underlying funds can be redeemed as long as there are no restrictions in place.
		(c)	This category includes hedge funds and funds of hedge funds that invest primarily in equities, fixed income securities, distressed credit, opportunistic and mortgage instruments and other third-party hedge funds. The fair values of the investments have been estimated using the NAV of the Company’s ownership interest in partners’ capital. It was estimated that the investments in the funds that are not subject to redemption will be liquidated over a weighted-average period of approximately two years and three years at September 30, 2014 and December 31, 2013, respectively.
		(d)	This category includes several private equity funds that initially invest in nonmarketable securities of private companies, which ultimately may become public in the future. The fair values of these investments have been estimated using capital accounts representing the Company’s ownership interest in the funds as well as other performance inputs. The Company’s investment in each fund is not subject to redemption and is normally returned through distributions as a result of the liquidation of the underlying assets of the private equity funds. It was estimated that the investments in these funds will be liquidated over a weighted-average period of approximately four years and five years at September 30, 2014 and December 31, 2013, respectively.
		(e)	This category includes several real estate funds that invest directly in real estate and real estate related assets. The fair values of the investments have been estimated using capital accounts representing the Company’s ownership interest in the funds. A majority of the Company’s investments are not subject to redemption or are not currently redeemable and are normally returned through distributions as a result of the liquidation of the underlying assets of the real estate funds. It is estimated that the investments in these funds not subject to redemptions will be liquidated over a weighted-average period of approximately seven years at both September 30, 2014 and December 31, 2013.
		(f)	This category includes investments in several real estate funds and certain hedge funds that invest in energy and health science related equity securities. The fair values of the investments in this category have been estimated using capital accounts representing the Company’s ownership interest in partners’ capital as well as performance inputs. The investments in hedge funds will be redeemed upon settlement of certain deferred compensation liabilities. The real estate investments are not subject to redemption; however, distributions as a result of the liquidation of the underlying assets will be used to settle certain deferred compensation liabilities over time.
		(g)	This category includes the underlying third-party private equity funds within one consolidated BlackRock sponsored private equity fund of funds. The fair values of the investments in the third-party funds have been estimated using capital accounts representing the Company’s ownership interest in each fund in the portfolio as well as other performance inputs. These investments are not subject to redemption; however, for certain funds the Company may sell or transfer its interest, which may need approval by the general partner of the underlying third-party funds. Due to the nature of the investments in this category, the Company reduces its investment by distributions that are received through the realization of the underlying assets of the funds. It is estimated that the underlying assets of these funds will be liquidated over a weighted-average period of approximately one and two years at September 30, 2014 and December 31, 2013, respectively. Total remaining unfunded commitments to other third-party funds were not material at both September 30, 2014 and December 31, 2013, which commitments are required to be funded by capital contributions from noncontrolling interest holders.
Summary of Information Related to those Assets and Liabilities for which Fair Value Option was Elected	'
	The following table summarizes information at September 30, 2014 and December 31, 2013 related to those assets and liabilities for which the fair value option was elected:
	(in millions)		September 30,			December 31,
			2014			2013
	CLO Bank Loans:
	Aggregate principal amounts outstanding			$2,799			$2,181
	Fair value			2,750			2,176
	Aggregate unpaid principal balance in excess of (less than) fair value			$49			$5
	Unpaid principal balance of loans more than 90 days past due			$6			$14
	Aggregate fair value of loans more than 90 days past due			2			9
	Aggregate unpaid principal balance in excess of fair value for loans more than 90 days past due			$4			$5
	CLO Borrowings:
	Aggregate principal amounts outstanding			$2,970			$2,455
	Fair value			$2,889			$2,369

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Balances Relating to Variable Interest Entities in which BlackRock is Primary Beneficiary	'
	At September 30, 2014 and December 31, 2013, the following balances related to VIEs were consolidated on the condensed consolidated statements of financial condition:
	(in millions)		September 30, 2014		December 31, 2013
	Assets of consolidated VIEs:
	Cash and cash equivalents			$175		$161
	Bank loans			2,750		2,176
	Bonds			50		106
	Other investments and other assets			83		43
	Total bank loans, bonds, other investments and other assets			2,883		2,325
	Liabilities of consolidated VIEs:
	Borrowings			-2,889		-2,369
	Other liabilities			-167		-74
	Appropriated retained earnings			13		-22
	Noncontrolling interests of consolidated VIEs			-15		-21
	Total BlackRock net interests in consolidated VIEs			$-		$-
Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary	'
	At September 30, 2014 and December 31, 2013, the Company’s carrying value of assets and liabilities and its maximum risk of loss related to VIEs for which it was the sponsor or in which it held a variable interest, but for which it was not the PB, was as follows:
	(in millions)		Variable Interests on the Condensed
			Consolidated
			Statement of Financial Condition
	At September 30, 2014		Investments		Advisory		Other Net		Maximum
					Fee		Assets		Risk of Loss(1)
					Receivables		(Liabilities)
	CDOs/CLOs			$-		$1		($5)		$18
	Other sponsored investment funds:
	Collective trusts			-		209		-		209
	Other			34		179		-4		213
	Total			$34		$389		($9)		$440
	At December 31, 2013
	CDOs/CLOs			$-		$1		($4)		$18
	Other sponsored investment funds:
	Collective trusts			-		184		-		184
	Other			37		137		-6		174
	Total			$37		$322		($10)		$376
	(1)	At both September 30, 2014 and December 31, 2013, BlackRock’s maximum risk of loss associated with these VIEs primarily related to advisory fee receivables and BlackRock’s investments.
Unconsolidated Collateralized Debt or Loan Obligations	'
	The net assets related to the above CDOs/CLOs that the Company does not consolidate were as follows:
	(in billions)		September 30, 2014		December 31, 2013
	Assets at fair value			$1		$1
	Liabilities(1)			2		2
	Net assets			($1)		($1)
	(1)	Amounts primarily comprised of unpaid principal debt obligations to CDO/CLO debt holders.

Goodwill_Tables

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill Activity	'
	Goodwill activity during the nine months ended September 30, 2014 was as follows:
	(in millions)
	December 31, 2013		$12,980
	Goodwill adjustment related to Quellos(1)		(14	)
	September 30, 2014		$12,966
	(1)	The decrease in goodwill during the nine months ended September 30, 2014 resulted from a decline related to tax benefits realized from tax-deductible goodwill in excess of book goodwill from the acquisition of the fund-of-funds business of Quellos Group, LLC in October 2007 (the “Quellos Transaction”). Goodwill related to the Quellos Transaction will continue to be reduced in future periods by the amount of tax benefits realized from tax-deductible goodwill in excess of book goodwill from the Quellos Transaction. The balance of the Quellos tax-deductible goodwill in excess of book goodwill was approximately $269 million and $293 million at September 30, 2014 and December 31, 2013, respectively.

Intangible_Assets_Tables

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Carrying Amounts of Identifiable Intangible Assets	'
	The carrying amounts of identifiable intangible assets are summarized as follows:
	(in millions)	Indefinite-lived			Finite-lived			Total
		intangible assets			intangible assets			intangible assets
	December 31, 2013		$16,991			$510			$17,501
	Amortization expense		-			(122	)		(122	)
	Other		(1	)		-			(1	)
	September 30, 2014		$16,990			$388			$17,378

Borrowings_Tables

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Carrying Value and Fair Value of Long-Term Borrowings	'
	The carrying value and fair value of long-term borrowings determined using market prices at the end of September 2014 included the following:
	(in millions)	Maturity Amount		Unamortized		Carrying Value		Fair Value
				Discount
	3.50% Notes due 2014		$1,000		$-		$1,000		$1,005
	1.375% Notes due 2015		750		-		750		755
	6.25% Notes due 2017		700		-1		699		793
	5.00% Notes due 2019		1,000		-2		998		1,150
	4.25% Notes due 2021		750		-3		747		814
	3.375% Notes due 2022		750		-4		746		765
	3.50% Notes due 2024		1,000		-3		997		1,013
	Total Long-term Borrowings		$5,950		($13)		$5,937		$6,295

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Restricted Stock and Restricted Stock Units ("RSUs") Activity	'
	Restricted stock and restricted stock units (“RSUs”) activity for the nine months ended September 30, 2014 is summarized below:
	Outstanding at		Restricted			Weighted-
			Stock and			Average
			RSUs			Grant Date
						Fair Value
	31-Dec-13			4,612,813			$207.94
	Granted			1,379,236			$318.67
	Converted			-2,540,301			$205.26
	Forfeited			-83,302			$238.97
	September 30, 2014(1)			3,368,446			$254.53
	(1)	At September 30, 2014, approximately 3.2 million awards are expected to vest and 0.2 million awards have vested but have not been converted.
Stock Options Activity	'
	Stock option activity for the nine months ended September 30, 2014 is summarized below:
	Outstanding at		Shares Under			Weighted-
			Option			Average
						Exercise
						Price
	December 31, 2013			931,758		$	167.76
	Exercised(1)			(15,032	)	$	167.76
	September 30, 2014(1)			916,726		$	167.76
	(1)	The aggregate intrinsic value of options exercised during the nine months ended September 30, 2014 was $2.1 million. At September 30, 2014, all options were vested.
Market Performance-based RSUs [Member]	'
Restricted Stock and Restricted Stock Units ("RSUs") Activity	'
	Market performance-based RSU activity for the nine months ended September 30, 2014 is summarized below:
	Outstanding at		Market			Weighted-
			Performance-			Average
			Based RSUs			Grant Date
						Fair Value
	December 31, 2013			1,132,113			$120.80
	Granted			315,961			$195.30
	Forfeited			-22,755			$121.13
	September 30, 2014(1)			1,425,319		$	137.31
	(1)	At September 30, 2014, approximately 1.4 million awards are expected to vest and an immaterial amount of awards have vested and have not been converted.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Changes in Accumulated Other Comprehensive Income	'
	Changes in AOCI by component for the three and nine months ended September 30, 2014 were as follows (in millions):
			Unrealized gains			Benefit plans			Foreign			Total(1)
			(losses) on						currency
			available-for-sale						translation
			investments						adjustments
	For the Three Months Ended September 30, 2014
	June 30, 2014		$	5		$	6		($	10	)	$	1
	Other comprehensive income (loss) before reclassifications(2)			(1	)		-			(167	)		(168	)
	Amount reclassified from AOCI(3)			(2	)		-			-			(2	)
	Net other comprehensive income (loss) for the three months ended September 30, 2014			(3	)		-			(167	)		(170	)
	September 30, 2014		$	2		$	6		($	177	)	($	169	)
	For the Nine Months Ended September 30, 2014
	December 31, 2013		$	7		$	6		($	48	)	($	35	)
	Other comprehensive income (loss) before reclassifications(2)			3			-			(129	)		(126	)
	Amount reclassified from AOCI(3)			(8	)		-			-			(8	)
	Net other comprehensive income (loss) for the nine months ended September 30, 2014			(5	)		-			(129	)		(134	)
	September 30, 2014		$	2		$	6		($	177	)	($	169	)
	(1)	All amounts are net of tax.
	(2)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2014.
	(3)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2014. The pre-tax amount reclassified from AOCI was included in net gain (loss) on investments on the condensed consolidated statements of income.
	Changes in AOCI by component for the three and nine months ended September 30, 2013 were as follows (in millions):
			Unrealized gains			Benefit plans			Foreign			Total(1)
			(losses) on						currency
			available-for-sale						translation
			investments						adjustments
	For the Three Months Ended September 30, 2013
	June 30, 2013		$	8		($	4	)	($	202	)	($	198	)
	Other comprehensive income (loss) before reclassifications(2)			2			-			118			120
	Amount reclassified from AOCI(3)			(1	)		-			-			(1	)
	Net other comprehensive income (loss) for the three months ended September 30, 2013			1			-			118			119
	September 30, 2013		$	9		($	4	)	($	84	)	($	79	)
	For the Nine Months Ended September 30, 2013
	December 31, 2012		$	16		($	4	)	($	71	)	($	59	)
	Other comprehensive income (loss) before reclassifications(2)			3			-			(13	)		(10	)
	Amount reclassified from AOCI(3)			(10	)		-			-			(10	)
	Net other comprehensive income (loss) for the nine months ended September 30, 2013			(7	)		-			(13	)		(20	)
	September 30, 2013		$	9		($	4	)	($	84	)	($	79	)
	(1)	All amounts are net of tax.
	(2)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2013.
	(3)	The tax benefit (expense) was not material for the three and nine months ended September 30, 2013. The pre-tax amount reclassified from AOCI was included in net gain (loss) on investments on the condensed consolidated statements of income.

Capital_Stock_Tables

Capital Stock (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Preferred Shares Authorized, Issued and Outstanding	'
	Nonvoting Participating Preferred Stock.    The Company’s preferred shares authorized, issued and outstanding consisted of the following:
		September 30,		December 31,
		2014		2013
	Series A
	Shares authorized, $0.01 par value		20,000,000		20,000,000
	Shares issued and outstanding		-		-
	Series B
	Shares authorized, $0.01 par value		150,000,000		150,000,000
	Shares issued and outstanding		823,188		823,188
	Series C
	Shares authorized, $0.01 par value		6,000,000		6,000,000
	Shares issued and outstanding		1,311,887		1,311,887
	Series D
	Shares authorized, $0.01 par value		20,000,000		20,000,000
	Shares issued and outstanding		-		-

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted EPS under Treasury Stock Method	'
	The following table sets forth the computation of basic and diluted EPS for the three and nine months ended September 30, 2014 and 2013 under the treasury stock method:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
	(in millions, except per share data)	2014		2013		2014		2013
	Net income attributable to BlackRock		$917		$730		$2,481		$2,091
	Basic weighted-average shares outstanding		167,933,040		169,811,633		168,571,354		170,581,930
	Dilutive effect of:
	Nonparticipating RSUs and stock options		2,845,726		3,559,875		2,779,922		3,430,946
	Total diluted weighted-average shares outstanding		170,778,766		173,371,508		171,351,276		174,012,876
	Basic earnings per share		$5.46		$4.30		$14.72		$12.26
	Diluted earnings per share		$5.37		$4.21		$14.48		$12.02

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Investment Advisory, Administration Fees, Securities Lending Revenue and Performance Fees, BlackRock Solutions and Advisory Revenue, Distribution Fees and Other Revenue	'
	The following table illustrates investment advisory, administration fees, securities lending revenue and performance fees, BlackRock Solutions and advisory revenue, distribution fees and other revenue for the three and nine months ended September 30, 2014 and 2013, respectively.
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
	(in millions)	2014		2013		2014		2013
	Equity	$	1,359	$	1,170	$	4,005	$	3,525
	Fixed income		554		490		1,601		1,488
	Multi-asset		323		266		922		777
	Alternatives		293		248		852		718
	Cash management		72		75		219		244
	Total investment advisory, administration fees, securities lending revenue and performance fees		2,601		2,249		7,599		6,752
	BlackRock Solutions and advisory		165		156		465		420
	Distribution fees		17		19		54		54
	Other revenue		66		48		179		177
	Total revenue	$	2,849	$	2,472	$	8,297	$	7,403
Total Revenue by Geographic Region	'
	The following table illustrates total revenue for the three and nine months ended September 30, 2014 and 2013, respectively, by geographic region. These amounts are aggregated on a legal entity basis and do not necessarily reflect where the customer resides.
	(in millions)	Three Months Ended				Nine Months Ended
		September 30,				September 30,
	Revenue	2014		2013		2014		2013
	Americas	$	1,877	$	1,632	$	5,425	$	4,967
	Europe		832		726		2,470		2,060
	Asia-Pacific		140		114		402		376
	Total revenue	$	2,849	$	2,472	$	8,297	$	7,403
Schedule of Long-Lived Assets by Geographic Region	'
	The following table illustrates long-lived assets that consist of goodwill and property and equipment at September 30, 2014 and December 31, 2013 by geographic region. These amounts are aggregated on a legal entity basis and do not necessarily reflect where the asset is physically located.
	(in millions)	September 30,		December 31,
	Long-lived Assets	2014		2013
	Americas	$	13,151	$	13,204
	Europe		198		214
	Asia-Pacific		85		87
	Total long-lived assets	$	13,434	$	13,505

Business_Overview_Additional_I

Business Overview - Additional Information (Detail) (PNC [Member])	Sep. 30, 2014
PNC [Member]	'
Related Party Transaction [Line Items]	'
Percentage of common stock of parent owned	21.00%
Percentage of capital stock of parent owned	22.00%

Significant_Accounting_Policie2

Significant Accounting Policies - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'
Fair value of loaned securities	$19,100,000,000	$19,700,000,000
Fair value of collateral held for loan securities	$20,966,000,000	$21,788,000,000
Minimum [Member]	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk	102.00%	'
Maximum [Member]	'	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'	'
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk	112.00%	'

Investments_Summary_of_Carryin

Investments - Summary of Carrying Value of Total Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investment [Line Items]	'	'
Available-for-sale investments	$221	$183
Held-to-maturity investments	64	83
Total trading investments	477	486
Consolidated sponsored investment funds	288	441
Equity method investments	658	697
Cost method investments	96	119
Carried interest	126	103
Total other investments	1,189	1,399
Total investments	1,951	2,151
Consolidated Sponsored Investment Funds [Member]	'	'
Investment [Line Items]	'	'
Total trading investments	396	385
Total other investments	288	441
Total investments	684	826
Other Equity and Debt Securities [Member]	'	'
Investment [Line Items]	'	'
Total trading investments	18	43
Deferred Compensation Plan Fund [Member]	'	'
Investment [Line Items]	'	'
Total trading investments	63	58
Equity method investments	21	39
Total other investments	$21	$39

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified			Maximum [Member]	Minimum [Member]	Consolidated Sponsored Investment Funds [Member]	Consolidated Sponsored Investment Funds [Member]	Deferred Compensation Plan Fund [Member]	Deferred Compensation Plan Fund [Member]	Equity and Debt Securities Held in Separate Investment Accounts [Member]	Equity and Debt Securities Held in Separate Investment Accounts [Member]
Investment [Line Items]	'	'	'	'	'	'	'	'	'	'
Total investments	$1,951	$2,151	'	'	$684	$826	'	'	'	'
Total trading investments	477	486	'	'	396	385	63	58	18	43
Other investments	1,189	1,399	'	'	288	441	21	39	'	'
Foreign government debt	64	83	'	'	'	'	'	'	'	'
Foreign government debt, one year or less	48	'	'	'	'	'	'	'	'	'
Maturity period of investments	'	'	'1 year	'10 years	'	'	'	'	'	'
Foreign government debt, after one year through five years	2	'	'	'	'	'	'	'	'	'
Maturity period of investments	'	'	'1 year	'5 years	'	'	'	'	'	'
Foreign government debt, after ten years	14	'	'	'	'	'	'	'	'	'
Trading securities, equity	'	'	'	'	204	172	'	'	'	'
Trading securities, debt	'	'	'	'	$192	$213	'	'	'	'

Investments_Summary_of_Cost_an

Investments - Summary of Cost and Carrying Value of Investments Classified as Available-for-Sale Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Available-for-sale investments, Cost	'	$181
Available-for-sale investments, Gross Unrealized Gains	'	6
Available-for-sale investments, Gross Unrealized Losses	'	-4
Available-for-sale investments, Carrying Value	221	183
Equity Securities of Sponsored Investment Funds [Member]	'	'
Schedule of Investments [Line Items]	'	'
Available-for-sale investments, Cost	222	180
Available-for-sale investments, Gross Unrealized Gains	7	4
Available-for-sale investments, Gross Unrealized Losses	-8	-4
Available-for-sale investments, Carrying Value	221	180
Other Securities [Member]	'	'
Schedule of Investments [Line Items]	'	'
Available-for-sale investments, Cost	'	1
Available-for-sale investments, Gross Unrealized Gains	'	2
Available-for-sale investments, Gross Unrealized Losses	'	0
Available-for-sale investments, Carrying Value	'	$3

Investments_Summary_of_Cost_an1

Investments - Summary of Cost and Carrying Value of Trading Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Cost	$440	$472
Carrying Value	477	486
Deferred Compensation Plan Fund [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	48	49
Carrying Value	63	58
Equity Securities/Multi-Asset Mutual Funds [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	195	174
Carrying Value	212	184
Corporate Debt [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	87	128
Carrying Value	88	128
Government Debt [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	97	121
Carrying Value	101	116
Asset/Mortgage Backed Debt [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	13	0
Carrying Value	$13	$0

Investments_Summary_of_Cost_an2

Investments - Summary of Cost and Carrying Value of Other Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Cost	$951	$1,177
Carrying Value	1,189	1,399
Consolidated Sponsored Investment Funds [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	274	420
Carrying Value	288	441
Equity Method [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	559	613
Carrying Value	658	697
Deferred Compensation Plan Fund [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	22	37
Carrying Value	21	39
Federal Reserve Bank Stock [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	91	90
Carrying Value	91	90
Other [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	5	17
Carrying Value	5	29
Total Cost Method Investments [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	96	107
Carrying Value	96	119
Carried Interest [Member]	'	'
Schedule of Investments [Line Items]	'	'
Cost	0	0
Carrying Value	$126	$103

Consolidated_Sponsored_Investm2

Consolidated Sponsored Investment Funds - Consolidated Sponsored Investment Funds Included in Condensed Consolidated Statements of Financial Condition (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Consolidated Sponsored Investment Funds [Line Items]	'	'	'	'
Cash and cash equivalents	$6,149	$4,390	$3,987	$4,606
Trading investments	477	486	'	'
Other investments	1,189	1,399	'	'
Other assets	766	692	'	'
Other liabilities	-971	-1,004	'	'
Noncontrolling interests	-114	-135	'	'
Consolidated Entities [Member]	'	'	'	'
Consolidated Sponsored Investment Funds [Line Items]	'	'	'	'
Cash and cash equivalents	127	114	'	'
Trading investments	396	385	'	'
Other investments	288	441	'	'
Other assets	17	20	'	'
Other liabilities	-11	-39	'	'
Noncontrolling interests	-163	-189	'	'
BlackRock's net interests in consolidated sponsored investment funds	$654	$732	'	'

Fair_Value_Disclosures_Assets_

Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	$221	$183
Total trading	477	486
Separate account assets	156,479	155,113
Total separate account collateral held under securities lending agreements	20,966	21,788
Borrowings of consolidated VIEs	5,937	4,939
Separate account collateral liabilities under securities lending agreements	20,966	21,788
Other Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	3
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	183
Total trading	477	486
Total consolidated sponsored investment funds	288	441
Total equity method	658	697
Deferred compensation plan equity method investments	21	39
Cost method investments	96	119
Carried interest	126	103
Total investments	1,951	2,151
Separate account assets	156,479	155,113
Total separate account collateral held under securities lending agreements	20,966	21,788
Total	182,279	181,416
Other assets	'	39
Separate account collateral liabilities under securities lending agreements	20,966	21,788
Other liabilities	44	64
Total liabilities measured at fair value	23,899	24,221
Fair Value, Measurements, Recurring [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	2,883	2,325
Borrowings of consolidated VIEs	2,889	2,369
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	63	58
Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	212	184
Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	202	244
Fair Value, Measurements, Recurring [Member] | Hedge Funds / Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	3	159
Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	285	282
Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	18	24
Fair Value, Measurements, Recurring [Member] | Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	319	339
Fair Value, Measurements, Recurring [Member] | Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	104	101
Fair Value, Measurements, Recurring [Member] | Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	121	125
Fair Value, Measurements, Recurring [Member] | Fixed Income Mutual Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	19	113
Fair Value, Measurements, Recurring [Member] | Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	95	'
Fair Value, Measurements, Recurring [Member] | Bank Loans and Other Assets [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	2,815	2,195
Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	50	106
Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset, Alternative Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	'	19
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	0
Total trading	0	0
Total consolidated sponsored investment funds	0	41
Total equity method	13	70
Deferred compensation plan equity method investments	0	0
Cost method investments	96	119
Carried interest	126	103
Total investments	299	416
Separate account assets	797	890
Total separate account collateral held under securities lending agreements	0	0
Total	1,161	1,325
Other assets	'	0
Separate account collateral liabilities under securities lending agreements	0	0
Other liabilities	0	0
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	65	19
Borrowings of consolidated VIEs	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Deferred Compensation Plan Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity/Multi-asset Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Hedge Funds / Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Private/ Public Equity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	0	41
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Private/ Public Equity [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	5	63
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	8	7
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Fixed Income Mutual Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	'
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Bank Loans and Other Assets [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	65	19
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Bonds [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	0	0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity/Multi-asset, Alternative Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	'	0
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	221	180
Total separate account collateral held under securities lending agreements	17,197	20,856
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Other Assets Not Held at Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	0	0
Total separate account collateral held under securities lending agreements	0	0
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	64	83
Total separate account collateral held under securities lending agreements	3,769	932
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Other Assets Not Held at Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	64	83
Total separate account collateral held under securities lending agreements	0	0
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	3
Fair Value, Measurements, Recurring [Member] | Other Securities [Member] | Other Assets Not Held at Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	180
Total trading	285	273
Total consolidated sponsored investment funds	6	5
Total equity method	114	132
Deferred compensation plan equity method investments	0	0
Cost method investments	0	0
Carried interest	0	0
Total investments	623	590
Separate account assets	111,222	113,382
Total separate account collateral held under securities lending agreements	17,197	20,856
Total	129,044	134,828
Other assets	'	0
Separate account collateral liabilities under securities lending agreements	17,197	20,856
Other liabilities	0	18
Total liabilities measured at fair value	17,197	20,874
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	2	0
Borrowings of consolidated VIEs	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	63	58
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	212	184
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	10	31
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Hedge Funds / Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	6	5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	2	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Income Mutual Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	19	113
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	95	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Bank Loans and Other Assets [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset, Alternative Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	'	19
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	218	180
Total separate account collateral held under securities lending agreements	17,197	20,856
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Total separate account collateral held under securities lending agreements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	3
Total trading	192	213
Total consolidated sponsored investment funds	21	148
Total equity method	262	197
Deferred compensation plan equity method investments	0	10
Cost method investments	0	0
Carried interest	0	0
Total investments	478	571
Separate account assets	44,460	40,841
Total separate account collateral held under securities lending agreements	3,769	932
Total	51,291	44,511
Other assets	'	39
Separate account collateral liabilities under securities lending agreements	3,769	932
Other liabilities	5	4
Total liabilities measured at fair value	3,774	936
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	2,584	2,128
Borrowings of consolidated VIEs	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	192	213
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Hedge Funds / Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	0	135
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	21	13
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	5	10
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	241	177
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	21	20
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Income Mutual Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	'
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Bank Loans and Other Assets [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	2,546	2,047
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	33	71
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset, Alternative Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	'	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	3	0
Total separate account collateral held under securities lending agreements	0	0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Total separate account collateral held under securities lending agreements	3,769	932
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	3
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total investments	551	574
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	0
Total trading	0	0
Total consolidated sponsored investment funds	261	247
Total equity method	269	298
Deferred compensation plan equity method investments	21	29
Cost method investments	0	0
Carried interest	0	0
Total investments	551	574
Separate account assets	0	0
Total separate account collateral held under securities lending agreements	0	0
Total	783	752
Other assets	'	0
Separate account collateral liabilities under securities lending agreements	0	0
Other liabilities	39	42
Total liabilities measured at fair value	2,928	2,411
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	232	178
Borrowings of consolidated VIEs	2,889	2,369
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Hedge Funds / Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	3	24
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total consolidated sponsored investment funds	258	223
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	11	14
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	73	99
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	104	101
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	92	98
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Income Mutual Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	0	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Bank Loans and Other Assets [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	204	129
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Bonds [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total assets of consolidated VIEs	17	35
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset, Alternative Mutual Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total equity method	'	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	0	0
Total separate account collateral held under securities lending agreements	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total trading	0	0
Total separate account collateral held under securities lending agreements	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available-for-sale	'	$0

Fair_Value_Disclosures_Assets_1

Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (Significant Unobservable Inputs (Level 3) [Member], Fair Value, Measurements, Recurring [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Third-parties [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Private equity investments	$181	$195
Direct Investments [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Private equity investments	77	28
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Third-parties [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets of consolidated VIEs, Private / public equity	$11	$14

Fair_Value_Disclosures_Additio

Fair Value Disclosures - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Private equity investments	$77	'	$77	'	$28
Operating performance projections covering period	'	'	'5 years	'	'
Distributions of earnings from equity method investees	'	'	44	39	'
Proceeds from borrowings	'	'	997	'	'
Repayment of borrowings	'	'	0	750	'
Settlements related to deconsolidation	'	'	'	134	'
Reclassification of investment	'	'	'	28	'
Significant Unobservable Inputs (Level 3) [Member]	'	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Investments	551	'	551	'	574
Distributions of earnings from equity method investees	30	17	77	37	'
Assets of Consolidated VIEs, Bank Loans [Member]	'	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Transfers out of Level 3	60	46	194	122	'
Transfers into Level 3	87	40	196	71	'
Assets of Consolidated VIEs, Bank Loans [Member] | Bank Loans and Other Assets [Member]	'	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Transfers out of Level 3	60	46	194	122	'
Transfers into Level 3	87	40	196	71	'
CLO Borrowings [Member]	'	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Principal amounts outstanding of the borrowings, maturity year, minimum	'	'	'2016	'	'
Principal amounts outstanding of the borrowings, maturity year, maximum	'	'	'2026	'	'
Loss on fair value borrowings	23	28	73	92	'
CLO Bank Loans and Bonds [Member]	'	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Gain (loss) on fair value assets	-6	25	73	104	'
Consolidated CLO [Member]	'	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'
Proceeds from borrowings	409	'	1,021	'	'
Repayment of borrowings	$193	'	$461	'	'

Fair_Value_Disclosures_Changes

Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Sponsored Investment Funds, Hedge Funds / Funds of Funds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	$5	$47	$24	$73
Realized and unrealized gains (losses) in earnings and OCI	0	2	0	8
Purchases	0	0	0	12
Sales and maturities	-2	-2	-20	-11
Issuances and other settlements	0	-2	-1	-30
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	-7
Assets measured at fair value, ending balance	3	45	3	45
Total net unrealized gains (losses) included in earnings	1	0	0	6
Consolidated Sponsored Investment Funds, Private Equity [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	272	249	223	266
Realized and unrealized gains (losses) in earnings and OCI	1	10	14	26
Purchases	12	0	37	12
Sales and maturities	-26	-23	-56	-62
Issuances and other settlements	-1	0	-1	0
Transfers into Level 3	0	0	41	0
Transfers out of Level 3	0	-2	0	-8
Assets measured at fair value, ending balance	258	234	258	234
Total net unrealized gains (losses) included in earnings	-3	7	9	21
Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	84	157	99	161
Realized and unrealized gains (losses) in earnings and OCI	2	1	6	10
Purchases	5	1	13	2
Sales and maturities	-4	-1	-11	-1
Issuances and other settlements	-14	-13	-34	-27
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Assets measured at fair value, ending balance	73	145	73	145
Total net unrealized gains (losses) included in earnings	0	1	4	10
Equity Method, Private Equity Investments [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	106	105	101	90
Realized and unrealized gains (losses) in earnings and OCI	1	4	10	14
Purchases	4	1	11	10
Sales and maturities	0	-10	0	-10
Issuances and other settlements	-7	-2	-18	-6
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Assets measured at fair value, ending balance	104	98	104	98
Total net unrealized gains (losses) included in earnings	2	4	11	14
Equity Method, Real Estate Funds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	96	97	98	88
Realized and unrealized gains (losses) in earnings and OCI	3	6	12	14
Purchases	1	2	5	5
Sales and maturities	-2	0	-5	0
Issuances and other settlements	-6	-2	-18	-4
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Assets measured at fair value, ending balance	92	103	92	103
Total net unrealized gains (losses) included in earnings	1	6	10	14
Equity Method, Deferred Compensation Plan Investments [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	27	'	29	'
Realized and unrealized gains (losses) in earnings and OCI	-3	'	-1	'
Purchases	0	'	0	'
Sales and maturities	0	'	0	'
Issuances and other settlements	-3	'	-7	'
Transfers into Level 3	0	'	0	'
Transfers out of Level 3	0	'	0	'
Assets measured at fair value, ending balance	21	'	21	'
Total net unrealized gains (losses) included in earnings	-2	'	0	'
Investments of Consolidated Funds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	590	656	574	679
Realized and unrealized gains (losses) in earnings and OCI	4	23	41	72
Purchases	22	4	66	41
Sales and maturities	-34	-36	-92	-84
Issuances and other settlements	-31	-19	-79	-67
Transfers into Level 3	0	0	41	0
Transfers out of Level 3	0	-2	0	-15
Assets measured at fair value, ending balance	551	626	551	626
Total net unrealized gains (losses) included in earnings	-1	18	34	65
Assets of Consolidated VIEs, Bank Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	153	93	129	106
Realized and unrealized gains (losses) in earnings and OCI	-3	0	-3	-1
Purchases	63	18	155	91
Sales and maturities	-36	-8	-79	-48
Issuances and other settlements	0	0	0	0
Transfers into Level 3	87	40	196	71
Transfers out of Level 3	-60	-46	-194	-122
Assets measured at fair value, ending balance	204	97	204	97
Assets of Consolidated VIEs, Bonds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	25	35	35	46
Realized and unrealized gains (losses) in earnings and OCI	0	1	0	0
Purchases	0	0	0	4
Sales and maturities	-8	-1	-18	-15
Issuances and other settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Assets measured at fair value, ending balance	17	35	17	35
Consolidated VIEs, Private Equity Fund [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	13	19	14	22
Realized and unrealized gains (losses) in earnings and OCI	0	0	1	1
Purchases	0	0	0	0
Sales and maturities	-2	-2	-4	-6
Issuances and other settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Assets measured at fair value, ending balance	11	17	11	17
Total Level 3 Assets of Consolidated VIEs [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	191	147	178	174
Realized and unrealized gains (losses) in earnings and OCI	-3	1	-2	0
Purchases	63	18	155	229
Sales and maturities	-46	-11	-101	-69
Issuances and other settlements	0	0	0	-134
Transfers into Level 3	87	40	196	71
Transfers out of Level 3	-60	-46	-194	-122
Assets measured at fair value, ending balance	232	149	232	149
Total net unrealized gains (losses) included in earnings	'	'	'	'
Total Level 3 Assets [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	781	803	752	855
Realized and unrealized gains (losses) in earnings and OCI	1	24	39	72
Purchases	85	22	221	270
Sales and maturities	-80	-47	-193	-155
Issuances and other settlements	-31	-19	-79	-201
Transfers into Level 3	87	40	237	71
Transfers out of Level 3	-60	-48	-194	-137
Assets measured at fair value, ending balance	783	775	783	775
Equity Securities (CDOs) [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	'	1	'	1
Realized and unrealized gains (losses) in earnings and OCI	'	0	'	0
Purchases	'	0	'	0
Sales and maturities	'	0	'	0
Issuances and other settlements	'	0	'	0
Transfers into Level 3	'	0	'	0
Transfers out of Level 3	'	0	'	0
Assets measured at fair value, ending balance	'	1	'	1
Total net unrealized gains (losses) included in earnings	'	0	'	0
Separate Account Assets [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	'	'	'	2
Realized and unrealized gains (losses) in earnings and OCI	'	'	'	0
Purchases	'	'	'	0
Sales and maturities	'	'	'	-2
Issuances and other settlements	'	'	'	0
Transfers into Level 3	'	'	'	0
Transfers out of Level 3	'	'	'	0
Assets measured at fair value, ending balance	'	0	'	0
Total net unrealized gains (losses) included in earnings	'	'	'	'
Assets of Consolidated VIEs, Fund of Hedge Funds [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Assets measured at fair value, beginning balance	'	'	'	0
Realized and unrealized gains (losses) in earnings and OCI	'	'	'	0
Purchases	'	'	'	134
Sales and maturities	'	'	'	0
Issuances and other settlements	'	'	'	-134
Transfers into Level 3	'	'	'	0
Transfers out of Level 3	'	'	'	0
Assets measured at fair value, ending balance	'	0	'	0
Borrowings of Consolidated VIEs [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Liabilities measured at fair value, beginning balance	2,699	2,145	2,369	2,402
Realized and unrealized gains (losses) in earnings and OCI	26	-5	40	-9
Purchases	0	0	0	0
Sales and maturities	0	0	0	0
Issuances and other settlements	216	-82	560	-343
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Liabilities measured at fair value, ending balance	2,889	2,068	2,889	2,068
Total net unrealized gains (losses) included in earnings	'	'	'	'
Other Liabilities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Liabilities measured at fair value, beginning balance	43	0	42	0
Realized and unrealized gains (losses) in earnings and OCI	0	0	-1	0
Purchases	0	0	0	0
Sales and maturities	0	0	0	0
Issuances and other settlements	-4	33	-4	33
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Liabilities measured at fair value, ending balance	39	33	39	33
Total net unrealized gains (losses) included in earnings	0	'	0	'
Total Level 3 Liabilities [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Liabilities measured at fair value, beginning balance	2,742	2,145	2,411	2,402
Realized and unrealized gains (losses) in earnings and OCI	26	-5	39	-9
Purchases	0	0	0	0
Sales and maturities	0	0	0	0
Issuances and other settlements	212	-49	556	-310
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Liabilities measured at fair value, ending balance	$2,928	$2,101	$2,928	$2,101

Fair_Value_Disclosures_Fair_Va

Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$6,149	$4,390	$3,987	$4,606
Long-term borrowings	5,937	4,939	'	'
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	6,149	4,390	'	'
Accounts receivable	2,631	2,247	'	'
Cash and cash equivalents of consolidated VIEs	175	161	'	'
Accounts payable and accrued liabilities	1,576	1,084	'	'
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Long-term borrowings	6,295	5,284	'	'
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	6,149	4,390	'	'
Accounts receivable	2,631	2,247	'	'
Cash and cash equivalents of consolidated VIEs	175	161	'	'
Accounts payable and accrued liabilities	1,576	1,084	'	'
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Long-term borrowings	$5,937	$4,939	'	'

Fair_Value_Disclosures_Fair_Va1

Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Per Share data, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$6,149	$4,390	$3,987	$4,606
Money market valuation floor	$1	'	'	'
Money market funds in cash and cash equivalents	94	64	'	'
Consolidated Sponsored Investment Funds [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$127	$114	'	'

Fair_Value_Disclosures_Investm

Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	$746	$898
Total Unfunded Commitments	149	189
Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	104	101
Total Unfunded Commitments	67	62
Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	113	118
Total Unfunded Commitments	9	12
Redemption Frequency (Quarterly)	19.00%	17.00%
Redemption Frequency (Not Redeemable)	81.00%	83.00%
Redemption Notice Period, Not Redeemable	'60 days	'60 days
Consolidated Sponsored Investment Funds, Other Funds of Hedge Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	2	155
Total Unfunded Commitments	'	'
Redemption Frequency (Quarterly)	100.00%	78.00%
Redemption Frequency (Monthly)	'	13.00%
Redemption Frequency (Not Redeemable)	'	9.00%
Consolidated Sponsored Investment Funds, Other Funds of Hedge Funds [Member] | Minimum [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Redemption Notice Period, days	'60 days	'30 days
Consolidated Sponsored Investment Funds, Other Funds of Hedge Funds [Member] | Maximum [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Redemption Notice Period, days	'90 days	'90 days
Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	314	276
Total Unfunded Commitments	43	84
Redemption Frequency (Quarterly)	47.00%	11.00%
Redemption Frequency (Monthly)	31.00%	55.00%
Redemption Frequency (Not Redeemable)	22.00%	34.00%
Equity Method, Hedge Funds/Funds of Hedge Funds [Member] | Minimum [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Redemption Notice Period, days	'15 days	'15 days
Equity Method, Hedge Funds/Funds of Hedge Funds [Member] | Maximum [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Redemption Notice Period, days	'90 days	'90 days
Equity Method, Deferred Compensation Plan Investments [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	21	39
Total Unfunded Commitments	5	7
Redemption Frequency (Quarterly)	'	18.00%
Redemption Frequency (Monthly)	'	8.00%
Redemption Frequency (Not Redeemable)	'	74.00%
Equity Method, Deferred Compensation Plan Investments [Member] | Minimum [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Redemption Notice Period, days	'	'60 days
Equity Method, Deferred Compensation Plan Investments [Member] | Maximum [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Redemption Notice Period, days	'	'90 days
Consolidated Sponsored Investment Funds, Private Equity [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	181	195
Total Unfunded Commitments	24	23
Consolidated VIEs, Private Equity Fund [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Fair Value	11	14
Total Unfunded Commitments	$1	$1

Fair_Value_Disclosures_Investm1

Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Parenthetical) (Detail) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Total Unfunded Commitments	$149	$189
Equity Method, Private Equity Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Liquidation period, years	'4 years	'5 years
Total Unfunded Commitments	67	62
Equity Method, Real Estate Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Liquidation period, years	'7 years	'7 years
Total Unfunded Commitments	9	12
Equity Method, Hedge Funds/Funds of Hedge Funds [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Liquidation period, years	'2 years	'3 years
Total Unfunded Commitments	43	84
Consolidated Sponsored Investment Funds, Private Equity [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Liquidation period, years	'6 years	'7 years
Total Unfunded Commitments	24	23
Amount of unfunded commitments contractually obligated to fund	33	30
Consolidated VIEs, Private Equity Fund [Member]	'	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'	'
Liquidation period, years	'1 year	'2 years
Total Unfunded Commitments	$1	$1

Fair_Value_Disclosures_Summary

Fair Value Disclosures - Summary of Information Related to those Assets and Liabilities for which Fair Value Option was Elected (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Aggregate principal amounts outstanding	$5,950	'
Fair value	6,295	'
CLO Bank Loans [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Aggregate principal amounts outstanding	2,799	2,181
Fair value	2,750	2,176
Aggregate unpaid principal balance in excess of (less than) fair value	49	5
Unpaid principal balance of loans more than 90 days past due	6	14
Aggregate fair value of loans more than 90 days past due	2	9
Aggregate unpaid principal balance in excess of fair value for loans more than 90 days past due	4	5
CLO Borrowings [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Aggregate principal amounts outstanding	2,970	2,455
Fair value	$2,889	$2,369

Variable_Interest_Entities_Bal

Variable Interest Entities - Balances Relating to Variable Interest Entities in which BlackRock is Primary Beneficiary (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Variable Interest Entity [Line Items]	'	'	'	'
Cash and cash equivalents	$6,149	$4,390	$3,987	$4,606
Borrowings	-6,295	'	'	'
Other liabilities	-971	-1,004	'	'
Noncontrolling interests of consolidated VIEs	-114	-135	'	'
Consolidated Entity, Variable Interest Entities VIE [Member]	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'
Cash and cash equivalents	175	161	'	'
Bank loans	2,750	2,176	'	'
Bonds	50	106	'	'
Other investments and other assets	83	43	'	'
Total bank loans, bonds, other investments and other assets	2,883	2,325	'	'
Borrowings	-2,889	-2,369	'	'
Other liabilities	-167	-74	'	'
Appropriated retained earnings	13	-22	'	'
Noncontrolling interests of consolidated VIEs	-15	-21	'	'
Total BlackRock net interests in consolidated VIEs	$0	$0	'	'

Variable_Interest_Entities_Add

Variable Interest Entities - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Variable Interest Entity [Line Items]	'	'	'	'	'	'
Nonoperating income (loss) attributable to nonredeemable noncontrolling interests	'	'	($44,000,000)	($1,000,000)	($25,000,000)	$11,000,000
Consolidated Entity, Variable Interest Entities VIE [Member]	'	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'	'
Nonoperating income (expense)	'	'	-47,000,000	-6,000,000	-35,000,000	-2,000,000
Nonoperating income (loss) attributable to nonredeemable noncontrolling interests	'	'	-47,000,000	-6,000,000	-35,000,000	-2,000,000
Weighted-average maturities of bank loans and bonds, years	'4 years 10 months 24 days	'4 years 8 months 12 days	'	'	'	'
Nonconsolidated Entity Variable Interest Entities VIE [Member]	'	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'	'
Other sponsored investments funds collective trusts	1,400,000,000,000	1,400,000,000,000	1,400,000,000,000	'	1,400,000,000,000	'
Nonconsolidated Entity Variable Interest Entities VIE [Member] | Minimum [Member]	'	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'	'
Other sponsored investments funds	1,700,000,000,000	1,600,000,000,000	1,700,000,000,000	'	1,700,000,000,000	'
Nonconsolidated Entity Variable Interest Entities VIE [Member] | Maximum [Member]	'	'	'	'	'	'
Variable Interest Entity [Line Items]	'	'	'	'	'	'
Other sponsored investments funds	1,800,000,000,000	1,700,000,000,000	$1,800,000,000,000	'	$1,800,000,000,000	'

Variable_Interest_Entities_Bal1

Variable Interest Entities - Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary (Detail) (Nonconsolidated Entity Variable Interest Entities VIE [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Variable Interest Entity [Line Items]	'	'
Collective trusts	$1,400,000	$1,400,000
Investments [Member]	'	'
Variable Interest Entity [Line Items]	'	'
CDOs/CLOs	0	0
Collective trusts	0	0
Other	34	37
Total	34	37
Advisory Fee Receivables [Member]	'	'
Variable Interest Entity [Line Items]	'	'
CDOs/CLOs	1	1
Collective trusts	209	184
Other	179	137
Total	389	322
Other Net Assets (Liabilities) [Member]	'	'
Variable Interest Entity [Line Items]	'	'
CDOs/CLOs	-5	-4
Collective trusts	0	0
Other	-4	-6
Total	-9	-10
Maximum Risk of Loss [Member]	'	'
Variable Interest Entity [Line Items]	'	'
CDOs/CLOs	18	18
Collective trusts	209	184
Other	213	174
Total	$440	$376

Variable_Interest_Entities_Unc

Variable Interest Entities - Unconsolidated Collateralized Debt or Loan Obligations (Detail) (Nonconsolidated Entity Variable Interest Entities VIE [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Billions, unless otherwise specified
Nonconsolidated Entity Variable Interest Entities VIE [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Assets at fair value	$1	$1
Liabilities	2	2
Net assets	($1)	($1)

Derivatives_and_Hedging_Additi

Derivatives and Hedging - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative [Line Items]	'	'
Derivative maximum risk of loss for credit protection	$17	'
Total Return Swap [Member]	'	'
Derivative [Line Items]	'	'
Notional value	176	117
Interest Rate Swap [Member]	'	'
Derivative [Line Items]	'	'
Notional value	79	71
Foreign Exchange Future [Member]	'	'
Derivative [Line Items]	'	'
Notional value	180	792
Foreign currency exchange contracts, Fair value	'	$26

Goodwill_Goodwill_Activity_Det

Goodwill - Goodwill Activity (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Goodwill [Abstract]	'
Balance at December 31, 2013	$12,980
Goodwill adjustment related to Quellos	-14
Balance at September 30, 2014	$12,966

Goodwill_Goodwill_Activity_Par

Goodwill - Goodwill Activity (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Goodwill [Abstract]	'	'
Excess of tax goodwill over book goodwill	$269	$293

Intangible_Assets_Carrying_Amo

Intangible Assets - Carrying Amounts of Identifiable Intangible Assets (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Intangible Assets [Line Items]	'	'	'	'
Intangible assets, Beginning balance	'	'	$17,501	'
Amortization expense	-40	-40	-122	-120
Other	-1	'	-1	'
Intangible assets, Ending balance	17,378	'	17,378	'
Indefinite-lived intangible assets [Member]	'	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'	'
Intangible assets, Beginning balance	'	'	16,991	'
Amortization expense	'	'	0	'
Other	-1	'	-1	'
Intangible assets, Ending balance	16,990	'	16,990	'
Finite-lived intangible assets [Member]	'	'	'	'
Schedule Of Intangible Assets [Line Items]	'	'	'	'
Intangible assets, Beginning balance	'	'	510	'
Amortization expense	'	'	-122	'
Other	0	'	0	'
Intangible assets, Ending balance	$388	'	$388	'

Other_Assets_Additional_Inform

Other Assets - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Other Assets [Line Items]	'	'	'	'
Gain related to PennyMac initial public offering	'	$0	$39	'
Charitable contribution	'	0	124	'
Gain related to the Charitable Contribution	'	0	80	'
Tax benefit related to Charitable Contribution	'	'	57	'
PennyMac [Member]	'	'	'	'
Other Assets [Line Items]	'	'	'	'
Gain related to PennyMac initial public offering	'	'	39	'
Charitable Contribution, by units	'	'	6.1	'
Charitable contribution	'	'	124	'
Gain related to the Charitable Contribution	80	'	'	'
Tax benefit related to Charitable Contribution	57	'	'	'
Ownership percentage	'	20.00%	'	20.00%
Shares and units	'	16	'	16
Carrying value - equity method investment	'	155	'	127
Fair value of equity method investments	'	$228	'	$273

Borrowings_Additional_Informat

Borrowings - Additional Information (Detail) (USD $)	9 Months Ended			1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Apr. 30, 2013	Mar. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Mar. 31, 2014	Sep. 30, 2014
				2014 Revolving Credit Facility [Member]	2014 Revolving Credit Facility [Member]	2014 Revolving Credit Facility [Member]	Unsecured Debt 2024 Notes [Member]	Unsecured Debt 2024 Notes [Member]
						Maximum [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'
Additional amount available, subject to lender credit approval	'	'	'	$1,000,000,000	'	'	'	'
Extended debt instrument maturity date	'	'	'	'	'March 2019	'	'	'
Unsecured revolving credit facility	'	'	3,990,000,000	3,990,000,000	'	'	'	'
Maximum amount available under facility	'	'	'	'	'	4,990,000,000	'	'
Line of credit facility, covenant terms	'The 2014 credit facility requires the Company not to exceed a maximum leverage ratio (ratio of net debt to earnings before interest, taxes, depreciation and amortization, where net debt equals total debt less unrestricted cash) of 3 to 1	'	'	'	'	'	'	'
Line of credit facility, covenant compliance	'Satisfied with a ratio of less than 1 to 1 at September 30, 2014.	'	'	'	'	'	'	'
Amount outstanding under credit facility	'	'	'	'	0	'	'	'
Commercial paper notes outstanding	0	0	'	'	'	'	'	'
Long-term borrowings	5,937,000,000	4,939,000,000	'	'	'	'	'	'
Long-term debt, fair value	'	5,284,000,000	'	'	'	'	'	'
Aggregate principal amount issued	'	'	'	'	'	'	1,000,000,000	'
Interest rate	'	'	'	'	'	'	3.50%	'
Approximate annual interest expense	'	'	'	'	'	'	35,000,000	'
Unamortized discount	13,000,000	'	'	'	'	'	3,000,000	'
Debt issuance costs incurred	'	'	'	'	'	'	$6,000,000	'
Senior unsecured and unsubordinated notes maturity date	'	'	'	'	'	'	'	18-Mar-24

Borrowings_Carrying_Value_and_

Borrowings - Carrying Value and Fair Value of Long-Term Borrowings (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Maturity Amount	$5,950	'
Unamortized discount	-13	'
Carrying Value	5,937	4,939
Fair value	6,295	'
3.50% Notes due 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	1,000	'
Unamortized discount	0	'
Carrying Value	1,000	'
Fair value	1,005	'
1.375% Notes due 2015 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	750	'
Unamortized discount	0	'
Carrying Value	750	'
Fair value	755	'
6.25% Notes due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	700	'
Unamortized discount	-1	'
Carrying Value	699	'
Fair value	793	'
5.00% Notes due 2019 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	1,000	'
Unamortized discount	-2	'
Carrying Value	998	'
Fair value	1,150	'
4.25% Notes due 2021 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	750	'
Unamortized discount	-3	'
Carrying Value	747	'
Fair value	814	'
3.375% Notes due 2022 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	750	'
Unamortized discount	-4	'
Carrying Value	746	'
Fair value	765	'
3.50% Notes due 2024 [Member]	'	'
Debt Instrument [Line Items]	'	'
Maturity Amount	1,000	'
Unamortized discount	-3	'
Carrying Value	997	'
Fair value	$1,013	'

Borrowings_Carrying_Value_and_1

Borrowings - Carrying Value and Fair Value of Long-Term Borrowings (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2014
3.50% Notes due 2014 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	3.50%
Debt instrument maturity date	'2014
1.375% Notes due 2015 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	1.38%
Debt instrument maturity date	'2015
6.25% Notes due 2017 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	6.25%
Debt instrument maturity date	'2017
5.00% Notes due 2019 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	5.00%
Debt instrument maturity date	'2019
4.25% Notes due 2021 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	4.25%
Debt instrument maturity date	'2021
3.375% Notes due 2022 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	3.38%
Debt instrument maturity date	'2022
3.50% Notes due 2024 [Member]	'
Debt Instrument [Line Items]	'
Long-term borrowings interest rate	3.50%
Debt instrument maturity date	'2024

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Loss Contingencies [Line Items]	'
Investment commitments relating primarily to funds of private equity funds, real estate funds and hedge funds	210,000,000
Contingent commitments	35,000,000
Derivative maximum risk of loss for credit protection	17,000,000
Loan balances	128,100,000,000
Collateral for indemnified securities	135,400,000,000
Credit Suisse [Member]	'
Loss Contingencies [Line Items]	'
Fee measurement period	'7 years
MGPA [Member]	'
Loss Contingencies [Line Items]	'
Fee measurement period	'5 years

StockBased_Compensation_Restri

Stock-Based Compensation - Restricted Stock and Restricted Stock Units ("RSUs") Activity (Detail) (USD $)	1 Months Ended	9 Months Ended
	Jan. 31, 2014	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Restricted Stock and RSUs, beginning of period	4,612,813	4,612,813
Restricted Stock and RSUs, Granted	'	1,379,236
Restricted Stock and RSUs, Converted	'	-2,540,301
Restricted Stock and RSUs, Forfeited	'	-83,302
Restricted Stock and RSUs, end of period	'	3,368,446
Weighted-Average Grant Date Fair Value, beginning of period	$207.94	$207.94
Weighted-Average Grant Date Fair Value, Granted	'	$318.67
Weighted-Average Grant Date Fair Value, Converted	'	$205.26
Weighted-Average Grant Date Fair Value, Forfeited	'	$238.97
Weighted-Average Grant Date Fair Value, end of period	'	$254.53
Market Performance-based RSUs [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Restricted Stock and RSUs, beginning of period	1,132,113	1,132,113
Restricted Stock and RSUs, Granted	315,961	315,961
Restricted Stock and RSUs, Forfeited	'	-22,755
Restricted Stock and RSUs, end of period	'	1,425,319
Weighted-Average Grant Date Fair Value, beginning of period	$120.80	$120.80
Weighted-Average Grant Date Fair Value, Granted	'	$195.30
Weighted-Average Grant Date Fair Value, Forfeited	'	$121.13
Weighted-Average Grant Date Fair Value, end of period	'	$137.31

StockBased_Compensation_Restri1

Stock-Based Compensation - Restricted Stock and Restricted Stock Units ("RSUs") Activity (Parenthetical) (Detail)	Sep. 30, 2014
In Millions, unless otherwise specified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation awards expected to vest	3.2
Awards vested, not converted	0.2
Market Performance-based RSUs [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Share-based compensation awards expected to vest	1.4

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Jan. 31, 2014	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
RSUs to employees as part of annual incentive compensation that vest ratably over three years from the date of grant	1,022,295	'
Restricted stock units vesting period, years	'3 years	'
Awards to employees cliff vesting	287,963	'
RSUs to employees that cliff vest, percentage	100.00%	'
RSUs to employees that cliff vest, date	'	31-Jan-17
Intrinsic value of outstanding RSUs	'	$1,100,000,000
Stock price	'	$328.32
Unrecognized stock-based compensation expense	'	367,000,000
Weighted-average period	'	'1 year 1 month 6 days
Restricted Stock and RSUs, Granted	'	1,379,236
Average life of stock options outstanding	'	'2 years
Market Performance-based RSUs [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Restricted Stock and RSUs, Granted	315,961	315,961
Long-Term Incentive Plans Funded by PNC [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares committed to fund long-term incentive plans	'	4,000,000
Number of additional shares surrendered	'	2,700,000
Remaining shares committed by PNC for long-term incentive awards	'	1,300,000
Unvested Market Performance-Based Awards [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Unrecognized stock-based compensation expense	'	$113,000,000
Remaining weighted-average period	'	'2 years 2 months 12 days

StockBased_Compensation_Stock_

Stock-Based Compensation - Stock Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Outstanding, Shares Under Option, beginning of period	931,758
Exercised, Shares Under Option	-15,032
Outstanding, Shares Under Option, end of period	916,726
Weighted-Average Exercise Price, beginning of period	$167.76
Exercised, Weighted-Average Exercise Price	$167.76
Weighted-Average Exercise Price, end of period	$167.76

StockBased_Compensation_Stock_1

Stock-Based Compensation - Stock Option Activity (Parenthetical) (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Aggregate intrinsic value of options exercised	$2.10

Net_Capital_Requirements_Addit

Net Capital Requirements - Additional Information (Detail) (USD $)	Sep. 30, 2014
In Billions, unless otherwise specified
Banking and Thrift [Abstract]	'
Net capital requirement in certain regulated subsidiaries	$1

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	$1	($198)	($35)	($59)
Other comprehensive income (loss) before reclassifications	-168	120	-126	-10
Amount reclassified from AOCI	-2	-1	-8	-10
Other comprehensive income (loss)	-170	119	-134	-20
Ending Balance	-169	-79	-169	-79
Unrealized Gains (Losses) on Available-for-Sale Investments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	5	8	7	16
Other comprehensive income (loss) before reclassifications	-1	2	3	3
Amount reclassified from AOCI	-2	-1	-8	-10
Other comprehensive income (loss)	-3	1	-5	-7
Ending Balance	2	9	2	9
Benefit Plans [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	6	-4	6	-4
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amount reclassified from AOCI	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Ending Balance	6	-4	6	-4
Foreign Currency Translation Adjustments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	-10	-202	-48	-71
Other comprehensive income (loss) before reclassifications	-167	118	-129	-13
Amount reclassified from AOCI	0	0	0	0
Other comprehensive income (loss)	-167	118	-129	-13
Ending Balance	($177)	($84)	($177)	($84)

Capital_Stock_Preferred_Shares

Capital Stock - Preferred Shares Authorized, Issued and Outstanding (Detail)	Sep. 30, 2014	Dec. 31, 2013
Series A Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Shares authorized, $0.01 par value	20,000,000	20,000,000
Shares issued	0	0
Shares outstanding	0	0
Series B Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Shares authorized, $0.01 par value	150,000,000	150,000,000
Shares issued	823,188	823,188
Shares outstanding	823,188	823,188
Series C Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Shares authorized, $0.01 par value	6,000,000	6,000,000
Shares issued	1,311,887	1,311,887
Shares outstanding	1,311,887	1,311,887
Series D Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Shares authorized, $0.01 par value	20,000,000	20,000,000
Shares issued	0	0
Shares outstanding	0	0

Capital_Stock_Preferred_Shares1

Capital Stock - Preferred Shares Authorized, Issued and Outstanding (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Series A Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Preferred stock, par value	$0.01	$0.01
Series B Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Preferred stock, par value	$0.01	$0.01
Series C Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Preferred stock, par value	$0.01	$0.01
Series D Non-voting Participating Preferred Stock [Member]	'	'
Schedule of Capitalization, Equity [Line Items]	'	'
Preferred stock, par value	$0.01	$0.01

Capital_Stock_Additional_Infor

Capital Stock - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Jan. 31, 2013
Statement of Stockholders' Equity [Abstract]	'	'
Share repurchase program authorized shares	'	10.2
Common shares repurchased	2.4	'
Common shares repurchased, value	$750	'
Shares authorized to be repurchased	4.1	'

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted EPS under Treasury Stock Method (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net income attributable to BlackRock	$917	$730	$2,481	$2,091
Basic weighted-average shares outstanding	167,933,040	169,811,633	168,571,354	170,581,930
Dilutive effect of nonparticipating RSUs and stock options	2,845,726	3,559,875	2,779,922	3,430,946
Total diluted weighted-average shares outstanding	170,778,766	173,371,508	171,351,276	174,012,876
Basic earnings per share	$5.46	$4.30	$14.72	$12.26
Diluted earnings per share	$5.37	$4.21	$14.48	$12.02

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes Disclosure [Line Items]	'	'	'	'
Deferred tax expense (benefit)associated with the revaluation of deferred income tax liabilities as a result of tax changes	($32)	($64)	$23	($64)
Tax benefit related to certain nonrecurring items	'	'	34	'
Tax benefit related to Charitable Contribution	'	'	'	57
Tax benefit primarily due to the realization of loss carryforwards	'	29	'	29
Barclays Global Investors [Member]	'	'	'	'
Income Taxes Disclosure [Line Items]	'	'	'	'
Tax benefit related to resolution of certain outstanding tax matters	94	'	'	'
Indemnification asset for unrecognized tax benefits	50	'	50	'
Offsetting tax benefit	50	'	'	'
General and Administrative Expense [Member] | Barclays Global Investors [Member]	'	'	'	'
Income Taxes Disclosure [Line Items]	'	'	'	'
Reduction of indemnification asset	$50	'	'	'

Segment_Information_Additional

Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
	Segment
Segment Reporting [Abstract]	'
Number of business segments	1

Segment_Information_Schedule_o

Segment Information - Schedule of Investment Advisory, Administration Fees, Securities Lending Revenue and Performance Fees, BlackRock Solutions and Advisory Revenue, Distribution Fees and Other Revenue (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	$2,849	$2,472	$8,297	$7,403
BlackRock Solutions and advisory	165	156	465	420
Distribution fees	17	19	54	54
Other revenue	66	48	179	177
Investment Advisory, Administration Fees and Securities Lending Revenue [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	2,601	2,249	7,599	6,752
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Equity [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	1,359	1,170	4,005	3,525
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Fixed Income [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	554	490	1,601	1,488
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Multi-asset [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	323	266	922	777
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Alternatives [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	293	248	852	718
Investment Advisory, Administration Fees and Securities Lending Revenue [Member] | Cash Management [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	72	75	219	244
BlackRock Solutions and Advisory [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
BlackRock Solutions and advisory	165	156	465	420
Distribution Fees [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Distribution fees	17	19	54	54
Other Revenue [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Other revenue	$66	$48	$179	$177

Segment_Information_Total_Reve

Segment Information - Total Revenue by Geographic Region (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	$2,849	$2,472	$8,297	$7,403
Americas [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	1,877	1,632	5,425	4,967
Europe [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	832	726	2,470	2,060
Asia-Pacific [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenue	$140	$114	$402	$376

Segment_Information_Schedule_o1

Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Segment Reporting Information [Line Items]	'	'
Long-lived assets	$13,434	$13,505
Americas [Member]	'	'
Segment Reporting Information [Line Items]	'	'
Long-lived assets	13,151	13,204
Europe [Member]	'	'
Segment Reporting Information [Line Items]	'	'
Long-lived assets	198	214
Asia-Pacific [Member]	'	'
Segment Reporting Information [Line Items]	'	'
Long-lived assets	$85	$87