BlackRock (BLK) 10-Q 8 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	BLK
Entity Registrant Name	BlackRock Inc.
Entity Central Index Key	1,364,742
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		160,978,194

Condensed Consolidated Statemen

Condensed Consolidated Statements of Financial Condition - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 5,508	$ 6,091
Accounts receivable	2,984	2,350
Investments	1,942	1,595
Separate account assets	146,888	149,089
Separate account collateral held under securities lending agreements	26,269	27,792
Property and equipment (net of accumulated depreciation of $671 and $601 at June 30,2017 and December 31, 2016, respectively)	549	559
Intangible assets (net of accumulated amortization of $882 and $832 at June 30, 2017and December 31, 2016, respectively)	17,423	17,363
Goodwill	13,199	13,118
Other assets	1,408	1,065
Total assets	217,488	220,177
Liabilities
Accrued compensation and benefits	1,140	1,880
Accounts payable and accrued liabilities	1,520	1,094
Liabilities of consolidated variable interest entities	295	216
Borrowings	4,970	4,915
Separate account liabilities	146,888	149,089
Separate account collateral liabilities under securities lending agreements	26,269	27,792
Deferred income tax liabilities	4,981	4,840
Other liabilities	1,538	1,007
Total liabilities	187,601	190,833
Commitments and contingencies (Note 11)
Temporary equity
Redeemable noncontrolling interests	271	194
Permanent Equity
Common stock, $0.01 par value; Shares authorized: 500,000,000 at June 30, 2017 and December 31, 2016; Shares issued: 171,252,185 at June 30, 2017 and December 31, 2016; Shares outstanding: 161,137,506 and 161,534,443 at June 30, 2017 and December 31, 2016, respectively;	2	2
Preferred stock (Note 15)	0	0
Additional paid-in capital	19,038	19,337
Retained earnings	14,523	13,660
Accumulated other comprehensive loss	(575)	(716)
Treasury stock, common, at cost (10,114,679 and 9,717,742 shares held at June 30, 2017 and December 31, 2016, respectively)	(3,433)	(3,185)
Total BlackRock, Inc. stockholders’ equity	29,555	29,098
Nonredeemable noncontrolling interests	61	52
Total permanent equity	29,616	29,150
Total liabilities, temporary equity and permanent equity	217,488	220,177
Consolidated Variable Interest Entities [Member]
Assets
Cash and cash equivalents	74	84
Investments	1,194	1,008
Other assets	50	63
Liabilities
Total liabilities	295	216
Permanent Equity
Nonredeemable noncontrolling interests	$ 255	$ 207

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 671	$ 601
Intangible assets, accumulated amortization	$ 882	$ 832
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	161,137,506	161,534,443
Treasury stock, common shares	10,114,679	9,717,742

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue
Total investment advisory, administration fees and securities lending revenue	$ 2,675	$ 2,489	$ 5,205	$ 4,848
Investment advisory performance fees	48	74	118	108
Technology and risk management revenue	164	146	322	287
Distribution fees	5	11	12	22
Advisory and other revenue	73	84	132	163
Total revenue	2,965	2,804	5,789	5,428
Expense
Employee compensation and benefits	999	977	2,020	1,924
Distribution and servicing costs	121	109	238	206
Amortization of deferred sales commissions	4	9	9	19
Direct fund expense	224	195	432	383
General and administration	350	316	651	634
Restructuring charge				76
Amortization of intangible assets	25	25	50	50
Total expense	1,723	1,631	3,400	3,292
Operating income	1,242	1,173	2,389	2,136
Nonoperating income (expense)
Net gain (loss) on investments	36	20	87	18
Interest and dividend income	13	6	20	11
Interest expense	(48)	(51)	(113)	(102)
Total nonoperating income (expense)	1	(25)	(6)	(73)
Income before income taxes	1,243	1,148	2,383	2,063
Income tax expense	376	353	645	621
Net income	867	795	1,738	1,442
Net income (loss) attributable to noncontrolling interests	10	6	19	(4)
Net income attributable to BlackRock, Inc.	$ 857	$ 789	$ 1,719	$ 1,446
Earnings per share attributable to BlackRock, Inc. common stockholders:
Basic	$ 5.27	$ 4.79	$ 10.56	$ 8.76
Diluted	5.22	4.73	10.45	8.66
Cash dividends declared and paid per share	$ 2.50	$ 2.29	$ 5	$ 4.58
Weighted-average common shares outstanding:
Basic	162,502,465	164,758,612	162,758,112	165,073,371
Diluted	164,149,861	166,639,290	164,544,760	167,023,559
Related Parties [Member]
Revenue
Total investment advisory, administration fees and securities lending revenue	$ 1,888	$ 1,713	$ 3,667	$ 3,330
Other Third Parties [Member]
Revenue
Total investment advisory, administration fees and securities lending revenue	$ 787	$ 776	$ 1,538	$ 1,518

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 867	$ 795	$ 1,738	$ 1,442
Other comprehensive income:
Foreign currency translation adjustments	[1]	102	(87)	142	(113)
Other			1	(1)	1
Other comprehensive income (loss)		102	(86)	141	(112)
Comprehensive income		969	709	1,879	1,330
Less: Comprehensive income (loss) attributable to noncontrolling interests		10	6	19	(4)
Comprehensive income attributable to BlackRock, Inc.		$ 959	$ 703	$ 1,860	$ 1,334
[1]	Amounts for the three months ended June 30, 2017 and 2016 include a loss from a net investment hedge of $31 million (net of a tax benefit of $18 million) and a gain of $12 million (net of tax of $8 million), respectively. Amounts for the six months ended June 30, 2017 and 2016 include a loss from a net investment hedge of $38 million (net of a tax benefit of $22 million) and $11 million (net of a tax benefit of $6 million), respectively.

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Gains (losses) from net investment hedging, net of tax	$ (31)	$ 12	$ (38)	$ (11)
Gains (losses) from net investment hedging, tax	$ (18)	$ 8	$ (22)	$ (6)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]		Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock Common [Member]	Total BlackRock Stockholders' Equity [Member]	Nonredeemable Noncontrolling Interests [Member]	Redeemable Noncontrolling Interests / Temporary Equity [Member]
Balance at Dec. 31, 2015	$ 28,580	$ 19,407	[1]	$ 12,033	$ (448)	$ (2,489)	$ 28,503	$ 77	$ 464
Net income	1,445			1,446			1,446	(1)	(3)
Dividends paid	(795)			(795)			(795)
Stock-based compensation	289	289	[1]				289
PNC preferred stock capital contribution	172	172	[1]				172
Retirement of preferred stock	(172)	(172)	[1]				(172)
Issuance of common shares related to employee stock transactions	10	(630)	[1]			640	10
Employee tax withholdings related to employee stock transactions	(266)					(266)	(266)
Shares repurchased	(575)					(575)	(575)
Net tax benefit (shortfall) from stock-based compensation	68	68	[1]				68
Subscriptions (redemptions/ distributions) — noncontrolling interest holders	(9)							(9)	753
Net consolidations (deconsolidations) of sponsored investment funds									(694)
Other comprehensive income (loss)	(112)				(112)		(112)
Balance at Jun. 30, 2016	28,635	19,134	[1]	12,684	(560)	(2,690)	28,568	67	520
Balance at Mar. 31, 2016					(474)
Other comprehensive income (loss)	(86)				(86)
Balance at Jun. 30, 2016	28,635	19,134	[1]	12,684	(560)	(2,690)	28,568	67	520
Balance at Dec. 31, 2016	29,150	19,339	[2]	13,660	(716)	(3,185)	29,098	52	194
Net income	1,721			1,719			1,719	2	17
Dividends paid	(854)			(854)			(854)
Stock-based compensation	290	290	[2]				290
PNC preferred stock capital contribution	193	193	[2]				193
Retirement of preferred stock	(193)	(193)	[2]				(193)
Issuance of common shares related to employee stock transactions	6	(592)	[2]			598	6
Employee tax withholdings related to employee stock transactions	(296)					(296)	(296)
Shares repurchased	(550)					(550)	(550)
Subscriptions (redemptions/ distributions) — noncontrolling interest holders	(7)							(7)	256
Net consolidations (deconsolidations) of sponsored investment funds	14							14	(196)
Other comprehensive income (loss)	141				141		141
Adoption of new accounting pronouncement	1	3	[2]	(2)			1
Balance at Jun. 30, 2017	29,616	19,040	[2]	14,523	(575)	(3,433)	29,555	61	271
Balance at Mar. 31, 2017					(677)
Other comprehensive income (loss)	102				102
Balance at Jun. 30, 2017	$ 29,616	$ 19,040	[2]	$ 14,523	$ (575)	$ (3,433)	$ 29,555	$ 61	$ 271
[1]	Amounts include $2 million of common stock at both June 30, 2016 and December 31, 2015.
[2]	Amounts include $2 million of common stock at both June 30, 2017 and December 31, 2016.

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Changes in Equity (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Additional Paid-in Capital, value of stock	$ 29,616	$ 29,150	$ 28,635	$ 28,580
Common Stock [Member]
Additional Paid-in Capital, value of stock	$ 2	$ 2	$ 2	$ 2

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 1,738	$ 1,442
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	125	133
Stock-based compensation	290	289
Deferred income tax expense (benefit)	174	55
Net (gains) losses on nontrading investments		1
Assets and liabilities of consolidated VIEs:
Change in cash and cash equivalents	(11)	(125)
Net (gains) losses within consolidated VIEs	(66)	(15)
Net (purchases) proceeds within consolidated VIEs	(122)	(534)
(Earnings) losses from equity method investees	(60)	(36)
Distributions of earnings from equity method investees	13	12
Changes in operating assets and liabilities:
Accounts receivable	(603)	(624)
Investments, trading	(128)	(222)
Other assets	(330)	(157)
Accrued compensation and benefits	(740)	(903)
Accounts payable and accrued liabilities	450	565
Other liabilities	409	21
Cash flows from operating activities	1,139	(98)
Cash flows from investing activities
Purchases of investments	(308)	(69)
Proceeds from sales and maturities of investments	64	197
Distributions of capital from equity method investees	18	15
Net consolidations (deconsolidations) of sponsored investment funds	(7)	(20)
Acquisitions	(73)	(30)
Purchases of property and equipment	(55)	(67)
Cash flows from investing activities	(361)	26
Cash flows from financing activities
Proceeds from long-term borrowings	697
Repayments of long-term borrowings	(700)
Cash dividends paid	(854)	(795)
Repurchases of common stock	(846)	(841)
Net (redemptions/distributions paid)/subscriptions received from noncontrolling interest holders	249	744
Excess tax benefit from stock-based compensation		72
Other financing activities	(9)	10
Cash flows from financing activities	(1,463)	(810)
Effect of exchange rate changes on cash and cash equivalents	102	(136)
Net increase (decrease) in cash and cash equivalents	(583)	(1,018)
Cash and cash equivalents, beginning of period	6,091	6,083
Cash and cash equivalents, end of period	5,508	5,065
Supplemental disclosure of cash flow information:
Interest	122	104
Income taxes (net of refunds)	626	639
Supplemental schedule of noncash investing and financing transactions:
Issuance of common stock	592	630
PNC preferred stock capital contribution	193	172
Increase (decrease) in noncontrolling interests due to net consolidation (deconsolidation) of sponsored investment funds	$ (182)	$ (694)

Business Overview

Business Overview	6 Months Ended
	Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [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 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 ® Aladdin ® At June 30, 2017, The PNC Financial Services Group, Inc. (“PNC”) held 21.3% of the Company’s voting common stock and 21.8% of the Company’s capital stock, which includes outstanding common and nonvoting preferred stock.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
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 normally is 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, 2016, which was filed with the Securities and Exchange Commission (“SEC”) on February 28, 2017 (“2016 Form 10-K”). The interim financial information at June 30, 2017 and for the three and six months ended June 30, 2017 and 2016 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. Certain items previously reported have been reclassified to conform to the current year presentation. Beginning with the first quarter of 2017, Aladdin BlackRock Solutions ® BlackRock Solutions BlackRock Solutions Accounting Pronouncements Adopted in the Six Months Ended June 30, 2017. Accounting for Share-Based Payments. In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-09, (“ASU 2016-09”). ASU 2016-09 simplifies accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the condensed consolidated statements of cash flows. The Company adopted ASU 2016-09 as of January 1, 2017. ASU 2016-09 requires all excess tax benefits and deficiencies to be recognized in income tax expense on the condensed consolidated statements of income. Accordingly, the Company recorded a discrete income tax benefit of $81 million during the three months ended March 31, 2017 for vested restricted stock units where the grant date stock price was lower than the vesting date stock price. The new guidance will increase the volatility of income tax expense as a result of fluctuations in the Company’s stock price. Upon adoption, the Company elected to account for forfeitures as they occur, which did not have a material impact on the condensed consolidated financial statements. In addition, the Company elected to present excess tax benefits and deficiencies prospectively in operating activities on the condensed consolidated statements of cash flows. Fair Value Measurements. Hierarchy of Fair Value Inputs . The Company uses a fair value hierarchy that prioritizes inputs to valuation approaches used to measure fair value. 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, 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. • Level 2 assets may include debt securities, investments in CLOs, short-term floating-rate notes, asset-backed securities, securities held within consolidated hedge funds, 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. • Level 3 assets may include direct private equity investments held within consolidated funds and investments in CLOs. • Level 3 liabilities include contingent liabilities related to acquisitions valued based upon discounted cash flow analyses using unobservable market data. 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 Approaches. The fair values of certain Level 3 assets and liabilities were determined using various valuation approaches as appropriate, including 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. A significant number of inputs used to value equity, debt securities and investments in CLOs 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 approaches, 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. Investments Measured at Net Asset Values. As a practical expedient, the Company uses net asset value (“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 hedge funds, real assets 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 could be used as an input to value these investments. Derivative Instruments and Hedging Activities . The Company does not use derivative financial instruments for trading or speculative purposes. The Company uses derivative financial instruments primarily for purposes of hedging exposures to fluctuations in foreign currency exchange rates of certain assets and liabilities, and market exposures for certain seed investments. However, certain consolidated sponsored investment funds may also utilize derivatives as a part of their investment strategy. Changes in the fair value of the Company’s derivative financial instruments are 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. The Company may also use financial instruments designated as net investment hedges for accounting purposes to hedge net investments in international subsidiaries whose functional currency is not U.S. dollars. The gain or loss from revaluing accounting hedges of net investments in foreign operations at the spot rate is deferred and reported within accumulated other comprehensive income on the condensed consolidated statements of financial condition. The Company reassesses the effectiveness of its net investment hedge on a quarterly basis. Money Market Fee Waivers . The Company is currently voluntarily waiving a portion of its management fees on certain money market funds to ensure that they maintain a targeted level of daily net investment income (the “Yield Support waivers”). During the three and six months ended June 30, 2017, these waivers resulted in a reduction of management fees of approximately $0 million and $6 million, respectively. During the three and six months ended June 30, 2016, these waivers resulted in a reduction of management fees of approximately $13 million and $25 million, respectively. Approximately 0% and 60% of Yield Support waivers for the six months ended June 30, 2017 and 2016, respectively, were offset by a reduction of BlackRock’s distribution and servicing costs paid to a financial intermediary. BlackRock may increase or decrease the level of Yield Support waivers in future periods. 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. 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 accounts maintained by BlackRock Life Limited are lent to third parties under global master securities lending agreements. In exchange, the Company receives legal title to the 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. 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. The Company records on the condensed consolidated statements of financial condition the cash and noncash collateral received under these BlackRock Life Limited securities lending arrangements as its own asset in addition to an equal and offsetting collateral liability for the obligation to return the collateral. The securities lending revenue earned from lending securities held by the separate accounts is included in investment advisory, administration fees and securities lending revenue on the condensed consolidated statements of income. During the six months ended June 30, 2017 and 2016, the Company had not resold or repledged any of the collateral received under these arrangements. At June 30, 2017 and December 31, 2016, the fair value of loaned securities held by separate accounts was approximately $23.8 billion and $25.7 billion, respectively, and the fair value of the collateral held under these securities lending agreements was approximately $26.3 billion and $27.8 billion, respectively. 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 guidance also changes the accounting for certain contract costs and revises the criteria for determining if an entity is acting as a principal or agent in certain arrangements. The Company continues to evaluate the impact of ASU 2014-09 on the presentation and recognition of its revenue contracts and certain contract costs. The most significant change identified to date relates to the presentation of certain distribution costs, which are currently presented net against revenues (contra-revenue) and will likely be presented as an expense on a gross basis. The Company will adopt ASU 2014-09 upon its effective date of January 1, 2018, together with all amending ASUs, and is currently evaluating which transition method it will apply. Recognition and Measurement of Financial Instruments . In January 2016, the FASB issued ASU 2016-01, (“ASU 2016-01”). ASU 2016-01 amends guidance on the classification and measurement of financial instruments, including significant revisions in accounting related to the classification and measurement of investments in equity securities and presentation of certain fair value changes for financial liabilities when the fair value option is elected. ASU 2016-01 also amends certain disclosure requirements associated with the fair value of financial instruments. ASU 2016-01 is effective for the Company on January 1, 2018. In the period of adoption, the Company is required to reclassify the unrealized gains/losses on equity securities within accumulated other comprehensive income to retained earnings, which is not expected to be material to the condensed consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, (“ASU 2016-02”), which requires lessees to recognize assets and liabilities arising from most operating leases on the statement of financial condition. The Company expects to record assets and liabilities for its current operating leases upon adoption of ASU 2016-02 and does not expect the adoption to have a material impact on its results of operations or cash flows. ASU 2016-02 is effective for the Company on January 1, 2019, and the Company intends to apply the practical expedients allowed by the standard upon transition. See Note 13 of the 2016 Form 10-K for information on the Company’s operating lease commitments. Cash Flow Classification. In August 2016, the FASB issued ASU 2016-15, (“ASU 2016-15”), which amends and clarifies the current guidance to reduce diversity in practice of the classification of certain cash receipts and payments in the statement of cash flows. The Company is currently evaluating the impact of adopting ASU 2016-15, which is effective for the Company on January 1, 2018 with early adoption permitted. The Company must apply the guidance retrospectively to all periods presented.

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Investments Debt And Equity Securities [Abstract]
Investments	3. Investments A summary of the carrying value of total investments is as follows: June 30, December 31, (in millions) 2017 2016 Available-for-sale investments $ 103 $ 80 Held-to-maturity investments 74 51 Trading investments: Consolidated sponsored investment funds 503 465 Other equity and debt securities 164 101 Deferred compensation plan mutual funds 52 59 Total trading investments 719 625 Other investments: Equity method investments (1) 935 730 Cost method investments (2) 92 91 Carried interest (3) 19 18 Total other investments 1,046 839 Total investments $ 1,942 $ 1,595 (1) Equity method investments primarily include BlackRock’s direct investments in certain BlackRock sponsored investment funds. ( 2 ) Amounts include nonmarketable securities, primarily Federal Reserve Bank stock, which is held for regulatory purposes and is restricted from sale. At June 30, 2017 and December 31, 2016, there were no indicators of impairment on these investments. (3 ) Carried interest of consolidated sponsor investment funds accounted for as voting rights entities (“VREs”) 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. Available-for-Sale Investments At both June 30, 2017 and December 31, 2016, available-for-sale investments primarily included certain investments in CLOs and seed investments in BlackRock sponsored mutual funds. The cost of these investments approximated carrying value. Held-to-Maturity Investments The carrying value of held-to-maturity investments was $74 million and $51 million at June 30, 2017 and December 31, 2016, respectively. Held-to-maturity investments included foreign government debt held primarily for regulatory purposes and certain investments in CLOs. The amortized cost (carrying value) of these investments approximated fair value. At June 30, 2017, $11 million of these investments mature between five to Trading Investments A summary of the cost and carrying value of trading investments is as follows: June 30, December 31, (in millions) 2017 2016 Cost Carrying Value Cost Carrying Value Trading investments: Deferred compensation plan mutual funds $ 34 $ 52 $ 41 $ 59 Equity securities/multi-asset mutual funds 374 408 290 308 Debt securities/fixed income mutual funds: Corporate debt 174 179 128 128 Government debt 30 30 60 60 Asset/mortgage backed debt 49 50 70 70 Total trading investments $ 661 $ 719 $ 589 $ 625 At June 30, 2017, trading investments included $242 million of debt securities and $261 million of equity securities held by consolidated sponsored investment funds accounted for as VREs, $52 million of certain deferred compensation plan mutual fund investments and $164 million of other equity and debt securities. At December 31, 2016, trading investments included $246 million of debt securities and $219 million of equity securities held by consolidated sponsored investment funds accounted for as VREs, $59 million of certain deferred compensation plan mutual fund investments and $101 million of other equity and debt securities. Other In addition, the Company accounts for its interest in PennyMac Financial Services, Inc. (“PennyMac”) as an equity method investment. At June 30, 2017 and December 31, 2016 the Company’s investment in PennyMac was excluded from investments in the table above and included in other assets on the condensed consolidated statements of financial condition. The carrying value and fair value of the Company’s interest (approximately 20% or 16 million shares and units) was approximately $317 million and $260 million, respectively, at June 30, 2017 and approximately $301 million and $259 million, respectively, at December 31, 2016. The fair value of the Company’s interest reflected the PennyMac stock price at June 30, 2017 and December 31, 2016, respectively (a Level 1 input). The Company performed an other-than-temporary impairment analysis as of June 30, 2017 and determined the decline in fair value below the carrying value to be temporary.

Consolidated Voting Rights Enti

Consolidated Voting Rights Entities	6 Months Ended
	Jun. 30, 2017
Text Block [Abstract]
Consolidated Voting Rights Entities	4. Consolidated Voting Rights Entities The Company consolidates certain sponsored investment funds accounted for as VREs because it is deemed to control such funds. The investments owned by these consolidated VREs are classified as trading investments. The following table presents the balances related to these consolidated VREs that were recorded on the condensed consolidated statements of financial condition, including BlackRock’s net interest in these funds: June 30, December 31, (in millions) 2017 2016 Cash and cash equivalents $ 86 $ 53 Trading investments 503 465 Other assets 29 15 Other liabilities (51 ) (50 ) Noncontrolling interests (77 ) (39 ) BlackRock’s net interests in consolidated VREs $ 490 $ 444 BlackRock’s total exposure to consolidated VREs 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 VREs are reflected in nonoperating income (expense) and partially offset in net income (loss) attributable to noncontrolling interests for the portion not attributable to BlackRock. The Company cannot readily access cash and cash equivalents held by consolidated VREs to use in its operating activities.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Variable Interest Entities	5. Variable Interest Entities In the normal course of business, the Company is the manager of various types of sponsored investment vehicles, which may be considered variable interest entities (“VIEs”). The Company 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’s involvement in financing the operations of the VIEs is generally limited to its investments in the entity. The Company consolidates entities when it is determined to be the primary beneficiary (“PB”). Consolidated VIEs. The Company’s consolidated VIEs include certain sponsored investment funds in which BlackRock has an investment and as the investment manager is deemed to have both the power to direct the most significant activities of the funds and the right to receive benefits (or the obligation to absorb losses) that could potentially be significant to these sponsored investment funds. 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. Consolidated VIE assets and liabilities are presented after intercompany eliminations in the following table: June 30, December 31, (in millions) 2017 2016 Assets of consolidated VIEs: Cash and cash equivalents $ 74 $ 84 Investments 1,194 1,008 Other assets 50 63 Total investments and other assets 1,244 1,071 Liabilities of consolidated VIEs (295 ) (216 ) Noncontrolling interests (255 ) (207 ) BlackRock's net interests in consolidated VIEs $ 768 $ 732 The Company recorded a $33 The Company recorded a $13 Non-Consolidated VIEs . At June 30, 2017 and December 31, 2016, the Company’s carrying value of assets and liabilities included on the condensed consolidated statements of financial condition pertaining to nonconsolidated VIEs and its maximum risk of loss related to VIEs for which it held a variable interest, but for which it was not the PB, was as follows: (in millions) At June Investments Advisory Fee Receivables Other Net Assets (Liabilities) Maximum Risk (1) Sponsored investment products $ 228 $ 12 $ (7 ) $ 257 At December Sponsored investment products $ 171 $ 9 $ (8 ) $ 197 (1) At both June 30, 2017 and December 31, 2016, BlackRock’s maximum risk of loss associated with these VIEs primarily related to BlackRock’s investments and the collection of advisory fee receivables. The net assets of sponsored investment products that are nonconsolidated VIEs approximated $5 billion and $4 billion at June 30, 2017 and December 31, 2016, respectively.

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Disclosures	6. 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 June 30, 2017 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Investments Measured at Other Assets Not Held at June 30, (in millions) (Level 1) (Level 2) (Level 3) NAV (1) Fair Value (2) 2017 Assets: Investments Available-for-sale $ 8 $ 72 $ 23 $ — $ — $ 103 Held-to-maturity securities — — — — 74 74 Trading: . Deferred compensation plan mutual funds 52 — — — — 52 Equity securities/Multi-asset mutual funds 408 — — — — 408 Debt securities / fixed income mutual funds 1 254 4 — — 259 Total trading 461 254 4 — — 719 Other investments: Equity method: Equity and fixed income mutual funds 305 — — 10 — 315 Other — — — 609 11 620 Total equity method 305 — — 619 11 935 Cost method investments — — — — 92 92 Carried interest — — — — 19 19 Total investments 774 326 27 619 196 1,942 Separate account assets 112,370 33,545 — — 973 146,888 Separate account collateral held under securities lending agreements: Equity securities 20,733 — — — — 20,733 Debt securities — 5,536 — — — 5,536 Total separate account collateral held under securities lending agreements 20,733 5,536 — — — 26,269 Investments of consolidated VIEs: Private / public equity (3) 5 5 113 77 80 280 Equity securities 300 — — — — 300 Debt securities — 316 — — — 316 Other — — — 64 — 64 Carried interest — — — — 234 234 Total investments of consolidated VIEs 305 321 113 141 314 1,194 Total $ 134,182 $ 39,728 $ 140 $ 760 $ 1,483 $ 176,293 Liabilities: Separate account collateral liabilities under securities lending agreements $ 20,733 $ 5,536 $ — $ — $ — $ 26,269 Other liabilities (4) — 7 218 — — 225 Total $ 20,733 $ 5,543 $ 218 $ — $ — $ 26,494 (1) Amounts are comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) 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 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. (3) Level 3 amounts primarily include direct investments in private equity companies held by private equity funds. (4) Amounts primarily include recorded contingent liabilities related to certain acquisitions (see Note 11, Commitments and Contingencies Assets and liabilities measured at fair value on a recurring basis and other assets not held at fair value December 31, 2016 (in millions) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investments Measured at NAV (1) Other Assets Not Held at Fair Value (2) December 31, 2016 Assets: Investments Available-for-sale $ 7 $ 49 $ 24 $ — $ — $ 80 Held-to-maturity securities — — — — 51 51 Trading: Deferred compensation plan mutual funds 59 — — — — 59 Equity/Multi-asset mutual funds 308 — — — — 308 Debt securities / fixed income mutual funds 1 250 7 — — 258 Total trading 368 250 7 — — 625 Other investments: Equity method: Equity and fixed income mutual funds 323 — — 5 — 328 Other — — — 394 8 402 Total equity method 323 — — 399 8 730 Cost method investments — — — — 91 91 Carried interest — — — — 18 18 Total investments 698 299 31 399 168 1,595 Separate account assets 109,663 38,542 — — 884 149,089 Separate account collateral held under securities lending agreements: Equity securities 22,173 — — — — 22,173 Debt securities — 5,619 — — — 5,619 Total separate account collateral held under securities lending agreements 22,173 5,619 — — — 27,792 Investments of consolidated VIEs: Private / public equity (3) 3 2 112 89 79 285 Equity securities 278 — — — — 278 Debt securities — 274 — — — 274 Other — — — 63 — 63 Carried interest — — — — 108 108 Total investments of consolidated VIEs 281 276 112 152 187 1,008 Total $ 132,815 $ 44,736 $ 143 $ 551 $ 1,239 $ 179,484 Liabilities: Separate account collateral liabilities under securities lending agreements $ 22,173 $ 5,619 $ — $ — $ — $ 27,792 Other liabilities (4) — 7 115 — — 122 Total $ 22,173 $ 5,626 $ 115 $ — $ — $ 27,914 (1) Amounts are comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) 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 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. (3) Level 3 amounts include direct investments in private equity companies held by private equity funds. (4) Amounts primarily include recorded contingent liabilities related to certain acquisitions (see Note 11, Commitments and Contingencies Level 3 Assets. Level 3 investments of consolidated VIEs of $113 million and $112 million at June 30, 2017 and December 31, 2016, respectively, related to direct investments in private equity companies held by consolidated private equity funds. 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 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 may include investments in CLOs valued based on single-broker nonbinding quotes and direct private equity investments valued using the market approach or the income approach as described above. Level 3 Liabilities. Level 3 other liabilities primarily include recorded contingent liabilities related to certain acquisitions, 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 June 30, 2017 (in millions) March 31, 2017 Realized and Unrealized Gains (Losses) in Earnings and OCI Purchases Sales and Maturities Issuances and other Settlements (1) Transfers into Level 3 Transfers out of Level 3 June 30, 2017 Total Net Unrealized Gains (Losses) Included in Earnings (2) Assets: Investments: Available-for-sale securities (3) $ — $ — $ 23 $ — $ — $ — $ — $ 23 Trading — — 4 — — — — 4 Total investments — — 27 — — — — 27 Assets of consolidated VIEs - Private equity 113 — — — — — — 113 Total Level 3 assets $ 113 $ — $ 27 $ — $ — $ — $ — $ 140 Liabilities: Other liabilities (4) $ 113 $ 3 $ — $ — $ 108 $ — $ — $ 218 $ 3 (1) ( 2 ) Earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at the reporting date. ( 3 ) Amounts include investments in CLOs. ( 4 ) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Six Months Ended June 30, 2017 (in millions) December 31, 2016 Realized and Unrealized Gains (Losses) in Earnings and OCI Purchases Sales and Maturities Issuances and other Settlements (1) Transfers into Level 3 Transfers out of Level 3 (2) June 30, 2017 Total Net Unrealized Gains (Losses) Included in Earnings (3) Assets: Investments: Available-for-sale securities (4) $ 24 $ — $ 23 $ — $ — $ — $ (24 ) $ 23 Trading 7 — 4 — — — (7 ) 4 Total investments 31 — 27 — — — (31 ) 27 Assets of consolidated VIEs - Private equity 112 1 — — — — 113 $ 1 Total Level 3 assets $ 143 $ 1 $ 27 $ — $ — $ — $ (31 ) $ 140 Liabilities: Other liabilities (5) $ 115 $ 5 $ — $ — $ 108 $ — $ — $ 218 $ 5 (1) (2) (3) (4) Amounts include investments in CLOs. (5) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended June 30, 2016 (in millions) March 31, 2016 Realized and Unrealized Gains (Losses) in Earnings and OCI Purchases Sales and Maturities Issuances and other Settlements (1) Transfers into Level 3 Transfers out of Level 3 June 30, 2016 Total Net Unrealized Gains (Losses) Included in Earnings (2) Assets: Investments: Available-for-sale securities (3) $ 23 $ — $ — $ — $ — $ — $ (23 ) $ — Trading 4 — — — — — (1 ) 3 Total investments 27 — — — — — (24 ) 3 Assets of consolidated VIEs - Private equity 192 — — (3 ) — — — 189 Total Level 3 assets $ 219 $ — $ — $ (3 ) $ — $ — $ (24 ) $ 192 Liabilities: Other liabilities (4) $ 49 $ 3 $ — $ — $ 75 $ — $ — $ 121 $ 3 (1) ® ( 2 ) Earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at the reporting date. ( 3 ) Amounts include investments in CLOs. ( 4 ) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Six Months Ended June 30, 2016 December 31, Realized and Unrealized Gains (Losses) in Earnings Sales and Issuances and other Transfers into Transfers out of June 30, Total Net Unrealized Gains (Losses) Included in (in millions) 2015 and OCI Purchases Maturities Settlements (1) Level 3 Level 3 2016 Earnings (2) Assets: Investments Available-for-sale securities (3) $ 23 $ — $ 23 $ — $ — $ — $ (46 ) $ — Trading 2 — 4 — — — (3 ) 3 Total investments 25 — 27 — — — (49 ) 3 Assets of consolidated VIEs - Private equity 196 2 — (9 ) — — — 189 $ 2 Total Level 3 assets $ 221 $ 2 $ 27 $ (9 ) $ — $ — $ (49 ) $ 192 Liabilities: Other liabilities (4) $ 48 $ 2 $ — $ — $ 75 $ — $ — $ 121 $ 2 (1) (2) Earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at the reporting date. (3) Amounts include investments in CLOs. (4) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. 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 sponsored investment funds 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 carrying value of certain equity method investments no longer represents fair value as determined under valuation methodologies. Disclosures of Fair Value for Financial Instruments Not Held at Fair Value . At June 30, 2017 and December 31, 2016, the fair value of the Company’s financial instruments not held at fair value are categorized in the table below: June 30, 2017 December 31, 2016 (in millions) Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Fair Value Hierarchy Financial Assets: Cash and cash equivalents $ 5,508 $ 5,508 $ 6,091 $ 6,091 Level 1 (1) (2) Accounts receivable 2,984 2,984 2,350 2,350 Level 1 (3) Cash and cash equivalents of consolidated VIEs 74 74 84 84 Level 1 (1) (2) Other assets 60 60 25 25 Level 1 (1) (4) Financial Liabilities: Accounts payable and accrued liabilities 1,520 1,520 1,094 1,094 Level 1 (3) Long-term borrowings 4,970 5,225 4,915 5,165 Level 2 (5) (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 June 30, 2017 and December 31, 2016, approximately $136 million and $132 million, respectively, of money market funds were recorded within cash and cash equivalents on the condensed consolidated statements of financial condition. In addition, at June 30, 2017 and December 31, 2016, approximately $21 million and $13 million, respectively, of money market funds were recorded within cash and cash equivalents of consolidated VIEs. Money market funds are valued based on quoted market prices, or $1.00 per share, which generally is the NAV of the fund. (3) The carrying amounts of accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term nature. (4) Other assets primarily include restricted cash. (5 ) Long-term borrowings are recorded at amortized cost net of debt issuance costs. 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 June 2017 and December 2016, respectively. See Note 10, 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 equivalent). June 30, 2017 (in millions) Ref Fair Value Total Unfunded Commitments Redemption Frequency Redemption Notice Period Equity method: (1) Hedge funds/funds of hedge funds (a) $ 253 $ 11 Daily/Monthly (21%) Quarterly (54%) N/R (25%) 1 – 90 days Private equity funds (b) 87 67 N/R N/R Real assets funds (c) 261 113 Quarterly (86%) N/R (14%) 60 days Other 18 22 Daily/Monthly (62%) N/R (38%) 3 – 5 days Consolidated VIEs: Private equity funds of funds (d) 77 20 N/R N/R Hedge fund (a) 22 — Quarterly 90 days Real assets funds (c) 42 54 N/R N/R Total $ 760 $ 287 December 31, 2016 (in millions) Ref Fair Value Total Unfunded Commitments Redemption Frequency Redemption Notice Period Equity method: (1) Hedge funds/funds of hedge funds (a) $ 237 $ 14 Daily/Monthly (21%) Quarterly (51%) N/R (28%) 1 – 90 days Private equity funds (b) 90 62 N/R N/R Real assets funds (c) 60 35 Quarterly (41%) N/R (59%) 60 days Other 12 9 Daily/Monthly (42%) N/R (58%) 3 – 5 days Consolidated VIEs: Private equity funds of funds (d) 89 16 N/R N/R Hedge fund (a) 36 — Quarterly 90 days Real assets funds (c) 27 21 N/R N/R Total $ 551 $ 157 N/R – not redeemable (1) Comprised of equity method investments, which include investments in 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 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 six years at June 30, 2017 and approximately one year at December 31, 2016. (b) 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 five (c) This category includes several real assets funds that invest directly in real estate, real estate related assets and infrastructure. The fair values of the investments have been estimated using capital accounts representing the Company’s ownership interest in the funds. The Company’s investments that are not subject to redemption or are not currently redeemable are normally returned through distributions as a result of the liquidation of the underlying assets of the funds. It is estimated that the investments in these funds not subject to redemptions will be liquidated over a weighted-average period of approximately eight years at June 30, 2017 and six years at December 31, 2016. The total remaining unfunded commitments to other third-party funds were $167 million and $56 million at June 30, 2017 and December 31, 2016, respectively. The Company had contractual obligations to the consolidated funds of $137 million at both June 30, 2017 and $56 million at December 31, 2016. ( d )

Derivatives and Hedging

Derivatives and Hedging	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017, the Company had outstanding total return swaps with aggregate notional values of approximately $588 million. At December 31, 2016, the Company had outstanding total return swaps and interest rate swaps with aggregate notional values of approximately $572 million and $42 million, respectively. Gains (losses) on the total return swaps are recorded in nonoperating income (expense) and were $ ( ( Gains (losses) on the interest rate swaps are recorded in nonoperating income (expense) and were not material for the three and six months ended June 30, 2017 and 2016. 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 discounted future cash outflows under the arrangement. The Company executes forward foreign currency exchange contracts to mitigate the risk of certain foreign exchange movements. At June 30, 2017 and December 31, 2016, the Company had outstanding forward foreign currency exchange contracts with aggregate notional values of approximately $1.2 billion and $107 million, respectively. Gains (losses) on the forward foreign currency exchange contracts are recorded in other general and administration expense and were $25 million and $29 million for the three and six months ended June 30, 2017, respectively. Gains (losses) on the forward foreign currency exchange contracts were not material for the three and six months ended June 30, 2016. The Company consolidates certain sponsored investment funds, which may utilize derivative instruments as a part of the funds’ investment strategies. The change in fair value of such derivatives, which is recorded in nonoperating income (expense), was not material for the three and six months ended June 30, 2017 and 2016. The fair value of the outstanding derivatives mentioned above were not material at June 30, 2017 and December 31, 2016. See Note 12, Borrowings

Goodwill

Goodwill	6 Months Ended
	Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	8. Goodwill Goodwill activity during the six months ended June 30, 2017 was as follows: (in millions) December 31, 2016 $ 13,118 Acquisition (1) 91 Goodwill adjustments related to Quellos (2) (10 ) June 30, 2017 $ 13,199 (1) Amount represents goodwill in connection with the First Reserve Transaction, which expanded the Company’s energy and power infrastructure platform. Total consideration included $120 million of contingent consideration at fair value at time of close. (2) The decrease in goodwill during the six months ended June 30, 2017 primarily 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 $184 million and $200 million at June 30, 2017 and December 31, 2016, respectively

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2017
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 December 31, 2016 $ 17,178 $ 185 $ 17,363 Amortization expense — (50 ) (50 ) Acquisition (1) — 110 110 June 30, 2017 $ 17,178 $ 245 $ 17,423 (1)

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Borrowings	10. Borrowings Short-Term Borrowings 2017 Revolving Credit Facility. The Company’s credit facility has an aggregate commitment amount of $4.0 billion and was amended in April 2017 to extend the maturity date to April 2022 (the “2017 credit facility”). The 2017 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 2017 credit facility to an aggregate principal amount not to exceed $5.0 billion. Interest on borrowings outstanding accrues at a rate based on the applicable London Interbank Offered Rate plus a spread. The 2017 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 June 30, 2017. The 2017 credit facility provides back-up liquidity to fund ongoing working capital for general corporate purposes and various investment opportunities. At June 30, 2017, the Company had no amount outstanding under the 2017 credit facility. Commercial Paper Program. The Company can issue unsecured commercial paper notes (the “CP Notes”) on a private-placement basis up to a maximum aggregate amount outstanding at any time of $4.0 billion. The commercial paper program is currently supported by the 2017 credit facility. At June 30, 2017, BlackRock had no CP Notes outstanding. Long-Term Borrowings The carrying value and fair value of long-term borrowings estimated using market prices and foreign exchange rates at June 30, 2017 included the following: (in millions) Maturity Amount Unamortized Discount and Debt Issuance Costs Carrying Value Fair Value 5.00% Notes due 2019 $ 1,000 $ (1 ) $ 999 $ 1,074 4.25% Notes due 2021 750 (4 ) 746 805 3.375% Notes due 2022 750 (4 ) 746 780 3.50% Notes due 2024 1,000 (6 ) 994 1,050 1.25% Notes due 2025 798 (6 ) 792 809 3.20% Notes due 2027 700 (7 ) 693 707 Total Long-term Borrowings $ 4,998 $ (28 ) $ 4,970 $ 5,225 Long-term borrowings at December 31, 2016 had a carrying value of $4.9 billion and a fair value of $5.2 billion determined using market prices at the end of December 2016. 2027 Notes . In March 2017, the Company issued $700 million in aggregate principal amount of 3.20% senior unsecured and unsubordinated notes maturing on March 15, 2027 (the “2027 Notes”). Interest is payable semi-annually on March 15 and September 15 of each year, commencing September 15, 2017, and is approximately $22 million per year. The 2027 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 unamortized discount and debt issuance costs are being amortized over the remaining term of the 2027 Notes. In April 2017, the net proceeds of the 2027 Notes were used to fully repay $700 million in aggregate principal amount outstanding of 6.25% notes prior to their maturity in September 2017. See Note 12, Borrowings

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies Investment Commitments. At June 30, 2017, the Company had $298 million of various capital commitments to fund sponsored investment funds, including consolidated VIEs. These funds include private equity funds, real assets funds and opportunistic 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 $298 million, the Company had approximately $3 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 that 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. Lease Commitment. In May 2017, the Company entered into an agreement with 50 HYMC Owner LLC, for the lease of approximately 847,000 square feet of office space located at 50 Hudson Yards, New York, New York. The term of the lease is twenty years from the date that rental payments begin, expected to occur in May 2023, with the option to renew for a specified term. Future minimum commitments of annual base rental payments under this operating lease are as follows: (in millions) Year Amount 2023 $ 34 2024 51 2025 51 2026 51 2027 51 Thereafter 1,007 Total $ 1,245 Contingencies Contingent Payments Related to Business Acquisitions . In connection with certain acquisitions, BlackRock is required to make contingent payments, subject to achieving specified performance targets, which may include revenue related to acquired contracts or new capital commitments for certain products. The fair value of the remaining aggregate contingent payments at June 30, 2017 totaled $218 million, including $120 million related to the First Reserve Transaction, and is included in other liabilities on the condensed consolidated statements of financial condition. Other Contingent Payments. The Company acts as the portfolio manager in a series of derivative transactions and has a maximum potential exposure of $17 million between the Company and counterparty. See Note 7, , for further discussion. 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, BlackRock advised investment portfolios may be subject to lawsuits, any of which potentially could harm the investment returns of the applicable portfolio or result in the Company being liable to the portfolios for any resulting damages. On May 27, 2014, certain purported investors in the BlackRock Global Allocation Fund, Inc. and the BlackRock Equity Dividend Fund (collectively, the “Funds”) filed a consolidated complaint (the “Consolidated Complaint”) in the U.S. District Court for the District of New Jersey against BlackRock Advisors, LLC, BlackRock Investment Management, LLC and BlackRock International Limited under the caption In re BlackRock Mutual Funds Advisory Fee Litigation Between November 12, 2015 and November 16, 2015, BlackRock, Inc., BlackRock Realty Advisors, Inc. (“BRA”), BlackRock US Core Property Fund, Inc. (formerly known as BlackRock Granite Property Fund, Inc.) (“Granite Fund”), and certain other Granite Fund related entities (collectively, the “BlackRock Parties”) were named as defendants in thirteen lawsuits filed in the Superior Court of the State of California for the County of Alameda arising out of the June 16, 2015 collapse of a balcony at the Library Gardens apartment complex in Berkeley, California (the “Property”). The Property is indirectly owned by the Granite Fund, which is managed by BRA. The plaintiffs also named as defendants in the lawsuits Greystar, which manages the Property, and certain other non-BlackRock related entities, including the developer of the Property, building contractors and building materials suppliers. The plaintiffs allege, among other things, that the BlackRock Parties were negligent in their ownership, control and maintenance of the Property’s balcony, and seek monetary, including punitive, damages. Additionally, on March 16, 2016, three former tenants of the Library Gardens apartment unit that experienced the balcony collapse sued the BlackRock Parties. The former tenants, who witnessed (but were not physically injured in) the accident make allegations virtually identical to those in the other previously filed actions and claim that, as a result of the collapse, they suffered unspecified emotional damage. Several defendants also filed cross-complaints alleging a variety of claims, including claims against the BlackRock Parties for contribution, negligence, and declaratory relief. BlackRock believes the claims against the BlackRock Parties are without merit and intends to vigorously defend the actions. On June 16, 2016, iShares iShares iShares On April 5, 2017, BlackRock, Inc., BlackRock Institutional Trust Company, N.A., the BlackRock, Inc. Retirement Committee and various sub-committees, and a BlackRock employee were named as defendants in a purported class action lawsuit brought in the U.S. District Court for the Northern District of California by a former employee on behalf of all BlackRock employee 401(k) Plan (the “Plan”) participants and beneficiaries in the Plan from April 5, 2011, to the present. The lawsuit generally alleges that the defendants breached their duties towards Plan participants in violation of the Employee Retirement Income Security Act of 1974 by, among other things, offering investment options that were overly expensive, underperformed peer funds, focused disproportionately on active versus passive strategies, and were unduly concentrated with investment options managed by BlackRock. While the complaint does not contain any specific amount in alleged damages, it claims that the purported underperformance and hidden fees cost Plan participants more than $60 million. The defendants believe the claims in this lawsuit are without merit and intend to vigorously defend the action. Management, after consultation with legal counsel, currently does not anticipate that the aggregate liability 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 June 30, 2017, the Company indemnified certain of its clients for their securities lending loan balances of approximately $184.8 billion. The Company held, as agent, cash and securities totaling $198.1 billion as collateral for indemnified securities on loan at June 30, 2017. The fair value of these indemnifications was not material at June 30, 2017.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	12. Stock-Based Compensation Restricted Stock and RSUs. Restricted stock and restricted stock units (“RSUs”) activity for the six months ended June 30, 2017 is summarized below. Outstanding at Restricted Stock and RSUs Weighted- Average Grant Date Fair Value December 31, 2016 2,987,588 $ 318.04 Granted 1,032,221 $ 375.93 Converted (1,294,073 ) $ 319.78 Forfeited (30,438 ) $ 338.43 June 30, 2017 (1) 2,695,298 $ 339.14 (1) At June 30, 2017, approximately 2.4 million awards are expected to vest and 0.3 million awards have vested but have not been converted. In January 2017, the Company granted 699,991 RSUs or shares of restricted stock to employees as part of 2016 annual incentive compensation that vest ratably over three years from the date of grant and 277,313 RSUs or shares of restricted stock to employees that cliff vest 100% on January 31, 2020. The Company values restricted stock and RSUs at their grant-date fair value as measured by BlackRock’s common stock price. The total fair market value of RSUs/restricted stock granted to employees during the six months ended June 30, 2017 was $388 million. At June 30, 2017, the intrinsic value of outstanding RSUs was $1.1 billion, reflecting a closing stock price of $422.41. At June 30, 2017, total unrecognized stock-based compensation expense related to unvested RSUs was $434 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted-average period of 1.4 years. Performance-Based RSUs. Performance-based RSU activity for the six months ended June 30, 2017 is summarized below. Outstanding at Performance- Based RSUs Weighted- Average Grant Date Fair Value December 31, 2016 610,371 $ 315.65 Granted 294,584 $ 375.27 Forfeited (1,430 ) $ 296.12 June 30, 2017 903,525 $ 335.12 In January 2017, the Company granted 293,385 performance-based RSUs to certain employees that cliff vest 100% on January 31, 2020. These awards are amortized over a service period of three years. The number of shares distributed at vesting could be higher or lower than the original grant based on the level of attainment of predetermined Company performance measures. The Company values performance-based RSUs at their grant-date fair value as measured by BlackRock’s common stock price. The total grant-date fair market value of performance-based RSUs granted to employees during the six months ended June 30, 2017 was $111 million. At June 30, 2017, the intrinsic value of outstanding performance-based RSUs was $382 million, reflecting a closing stock price of $422.41. At June 30, 2017, total unrecognized stock-based compensation expense related to unvested performance-based awards was $157 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted-average period of 1.7 years. Market Performance-based RSUs. Market performance-based RSUs activity for the six months ended June 30, 2017 is summarized below. Outstanding at Market Performance- Based RSUs Weighted- Average Grant Date Fair Value December 31, 2016 803,474 $ 151.20 Converted (517,138 ) $ 126.76 June 30, 2017 (1) 286,336 $ 195.33 (1) See Note 14, Stock-Based Compensation, At June 30, 2017, the intrinsic value of outstanding market performance-based RSUs was $121 million reflecting a closing stock price of $422.41. At June 30, 2017, total unrecognized stock-based compensation expense related to unvested market performance-based awards was $7 million. The unrecognized compensation cost is expected to be recognized over the remaining weighted-average period of less than one year. 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”), including performance-based and market performance-based RSUs. The current share surrender agreement commits PNC to provide BlackRock Series C nonvoting participating preferred stock to fund the remaining committed shares. As of June 30, 2017, 3.8 million shares had been surrendered by PNC. 517,138 shares were surrendered by PNC in the first quarter of 2017. At June 30, 2017, the remaining shares committed by PNC of 0.2 million were available to fund certain future long-term incentive awards.

Net Capital Requirements

Net Capital Requirements	6 Months Ended
	Jun. 30, 2017
Regulatory Capital Requirements [Abstract]
Net Capital Requirements	13. 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. At June 30, 2017, the Company was required to maintain approximately $1.6 billion in net capital in certain regulated subsidiaries, including BlackRock Institutional Trust Company, N.A. (a wholly owned subsidiary of the Company that is chartered as a national bank whose powers are limited to trust and other fiduciary 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. The Company was in compliance with all applicable regulatory net capital requirements.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	14. Accumulated Other Comprehensive Income (Loss) The following tables present changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2017 and 2016: (in millions) Foreign currency translation adjustments (1) Other (2) Total For the Three Months Ended June 30, 2017 March 31, 2017 $ (681 ) $ 4 $ (677 ) Net other comprehensive income (loss) for the three months ended June 30, 2017 102 — 102 June 30, 2017 $ (579 ) $ 4 $ (575 ) For the Six Months Ended June 30, 2017 December 31, 2016 $ (721 ) $ 5 $ (716 ) Net other comprehensive income (loss) for the six months ended June 30, 2017 142 (1 ) 141 June 30, 2017 $ (579 ) $ 4 $ (575 ) (1) Amount for the three and six months ended June 30, 2017 includes a loss from a net investment hedge of $31 million (net of a tax benefit of $18 million) and $38 million (net of a tax benefit of $22 million), respectively. (2) (in millions) Foreign currency translation adjustments (1) Other (2) Total For the Three Months Ended June 30, 2016 March 31, 2016 $ (478 ) $ 4 $ (474 ) Net other comprehensive income (loss) for the three months ended June 30, 2016 (87 ) 1 (86 ) June 30, 2016 $ (565 ) $ 5 $ (560 ) For the Six Months Ended June 30, 2016 December 31, 2015 $ (452 ) $ 4 $ (448 ) Net other comprehensive income (loss) for the six months ended June 30, 2016 (113 ) 1 (112 ) June 30, 2016 $ (565 ) $ 5 $ (560 ) ( 1) ( 2 )

Capital Stock

Capital Stock	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Capital Stock	15. Capital Stock Nonvoting Participating Preferred Stock . The Company’s preferred shares authorized, issued and outstanding consisted of the following: June 30, December 31, 2017 2016 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 (1) 823,188 823,188 Series C Shares authorized, $0.01 par value 6,000,000 6,000,000 Shares issued and outstanding (1) 246,522 763,660 Series D Shares authorized, $0.01 par value 20,000,000 20,000,000 Shares issued and outstanding — — (1) Shares held by PNC. Share Repurchases . The Company repurchased 1.4 million common shares in open market transactions under the share repurchase program for approximately $550 million during the six months ended June 30, 2017. At June 30, 2017, there were 7.6 million shares still authorized to be repurchased. PNC Capital Contribution . During the three months ended March 31, 2017, PNC surrendered to BlackRock 517,138 shares of BlackRock Series C Preferred to fund certain LTIP awards.

Restructuring Charge

Restructuring Charge	6 Months Ended
	Jun. 30, 2017
Restructuring And Related Activities [Abstract]
Restructuring Charge	16. Restructuring Charge A restructuring charge of $76 million ($53 million after-tax), comprised of $44 million of severance and $32 million of expense related to the accelerated amortization of previously granted deferred cash and equity compensation awards, was recorded in the first quarter of 2016 in connection with a project to streamline and simplify the organization. At June 30, 2017 and December 31, 2016, the restructuring liability was $2 million and $4 million, respectively, and is included within other liabilities on the condensed consolidated statements of financial condition .

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
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 earnings per share (“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 six months ended June 30, 2017 and 2016 under the treasury stock method: Three Months Ended Six Months Ended June 30, June 30, (in millions, except shares and per share data) 2017 2016 2017 2016 Net income attributable to BlackRock $ 857 $ 789 $ 1,719 $ 1,446 Basic weighted-average shares outstanding 162,502,465 164,758,612 162,758,112 165,073,371 Dilutive effect of nonparticipating RSUs and stock options 1,647,396 1,880,678 1,786,648 1,950,188 Total diluted weighted-average shares outstanding 164,149,861 166,639,290 164,544,760 167,023,559 Basic earnings per share $ 5.27 $ 4.79 $ 10.56 $ 8.76 Diluted earnings per share $ 5.22 $ 4.73 $ 10.45 $ 8.66

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Information	18. Segment Information The Company’s management directs BlackRock’s operations as one business, the asset management business. The Company utilizes a consolidated approach to assess performance and allocate resources. As such, the Company operates in one business segment as defined in ASC 280-10. The following table illustrates investment advisory, administration fees, securities lending revenue and performance fees by product type, technology and risk management revenue, distribution fees, and advisory and other revenue for the three and six months ended June 30, 2017 and 2016. Three Months Ended Six Months Ended June 30, June 30, (in millions) 2017 2016 2017 2016 Equity $ 1,378 $ 1,278 $ 2,677 $ 2,462 Fixed income 713 657 1,404 1,280 Multi-asset 289 293 566 580 Alternatives 206 216 412 412 Cash management 137 119 264 222 Total investment advisory, administration fees, securities lending revenue and performance fees 2,723 2,563 5,323 4,956 Technology and risk management revenue 164 146 322 287 Distribution fees 5 11 12 22 Advisory and other revenue 73 84 132 163 Total revenue $ 2,965 $ 2,804 $ 5,789 $ 5,428 The following table illustrates total revenue for the three and six months ended June 30, 2017 and 2016 by geographic region. These amounts are aggregated on a legal entity basis and do not necessarily reflect where the customer resides or affiliated services are provided. Three Months Ended Six Months Ended (in millions) June 30, June 30, Revenue 2017 2016 2017 2016 Americas $ 2,012 $ 1,876 $ 3,951 $ 3,646 Europe 803 792 1,550 1,514 Asia-Pacific 150 136 288 268 Total revenue $ 2,965 $ 2,804 $ 5,789 $ 5,428 The following table illustrates long-lived assets that consist of goodwill and property and equipment at June 30, 2017 and December 31, 2016 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) June 30, December 31, Long-lived Assets 2017 2016 Americas $ 13,498 $ 13,424 Europe 163 163 Asia-Pacific 87 90 Total long-lived assets $ 13,748 $ 13,677 Americas primarily is comprised of the United States and Canada, while Europe primarily is comprised of the United Kingdom and Luxembourg. Asia-Pacific primarily is comprised of Hong Kong, Australia, Japan and Singapore.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events In June 2017, the Company announced that it entered into an agreement for a minority investment in Scalable Capital, a digital investment manager in Europe. The transaction is expected to close in the third quarter of 2017, subject to customary regulatory approvals and closing conditions. In July 2017, the Company completed the acquisition of Cachematrix, a leading provider of financial technology which simplifies the cash management process for banks and their corporate clients in a streamlined, open-architecture platform. These transactions are not expected to be material to the Company’s condensed consolidated statements of financial condition or results of operations. The Company conducted a review for additional subsequent events and determined that no subsequent events had occurred that would require accrual or additional disclosures.

Significant Accounting Polici29

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
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 normally is 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, 2016, which was filed with the Securities and Exchange Commission (“SEC”) on February 28, 2017 (“2016 Form 10-K”). The interim financial information at June 30, 2017 and for the three and six months ended June 30, 2017 and 2016 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. Certain items previously reported have been reclassified to conform to the current year presentation. Beginning with the first quarter of 2017, Aladdin BlackRock Solutions ® BlackRock Solutions BlackRock Solutions
Accounting Pronouncements Adopted in the Six Months Ended June 30, 2017	Accounting Pronouncements Adopted in the Six Months Ended June 30, 2017. Accounting for Share-Based Payments. In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-09, (“ASU 2016-09”). ASU 2016-09 simplifies accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the condensed consolidated statements of cash flows. The Company adopted ASU 2016-09 as of January 1, 2017. ASU 2016-09 requires all excess tax benefits and deficiencies to be recognized in income tax expense on the condensed consolidated statements of income. Accordingly, the Company recorded a discrete income tax benefit of $81 million during the three months ended March 31, 2017 for vested restricted stock units where the grant date stock price was lower than the vesting date stock price. The new guidance will increase the volatility of income tax expense as a result of fluctuations in the Company’s stock price. Upon adoption, the Company elected to account for forfeitures as they occur, which did not have a material impact on the condensed consolidated financial statements. In addition, the Company elected to present excess tax benefits and deficiencies prospectively in operating activities on the condensed consolidated statements of cash flows.
Fair Value Measurements	Fair Value Measurements. Hierarchy of Fair Value Inputs . The Company uses a fair value hierarchy that prioritizes inputs to valuation approaches used to measure fair value. 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, 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. • Level 2 assets may include debt securities, investments in CLOs, short-term floating-rate notes, asset-backed securities, securities held within consolidated hedge funds, 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. • Level 3 assets may include direct private equity investments held within consolidated funds and investments in CLOs. • Level 3 liabilities include contingent liabilities related to acquisitions valued based upon discounted cash flow analyses using unobservable market data. 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 Approaches. The fair values of certain Level 3 assets and liabilities were determined using various valuation approaches as appropriate, including 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. A significant number of inputs used to value equity, debt securities and investments in CLOs 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 approaches, 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. Investments Measured at Net Asset Values. As a practical expedient, the Company uses net asset value (“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 hedge funds, real assets 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 could be used as an input to value these investments.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities . The Company does not use derivative financial instruments for trading or speculative purposes. The Company uses derivative financial instruments primarily for purposes of hedging exposures to fluctuations in foreign currency exchange rates of certain assets and liabilities, and market exposures for certain seed investments. However, certain consolidated sponsored investment funds may also utilize derivatives as a part of their investment strategy. Changes in the fair value of the Company’s derivative financial instruments are 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. The Company may also use financial instruments designated as net investment hedges for accounting purposes to hedge net investments in international subsidiaries whose functional currency is not U.S. dollars. The gain or loss from revaluing accounting hedges of net investments in foreign operations at the spot rate is deferred and reported within accumulated other comprehensive income on the condensed consolidated statements of financial condition. The Company reassesses the effectiveness of its net investment hedge on a quarterly basis.
Money Market Fee Waivers	Money Market Fee Waivers . The Company is currently voluntarily waiving a portion of its management fees on certain money market funds to ensure that they maintain a targeted level of daily net investment income (the “Yield Support waivers”). During the three and six months ended June 30, 2017, these waivers resulted in a reduction of management fees of approximately $0 million and $6 million, respectively. During the three and six months ended June 30, 2016, these waivers resulted in a reduction of management fees of approximately $13 million and $25 million, respectively. Approximately 0% and 60% of Yield Support waivers for the six months ended June 30, 2017 and 2016, respectively, were offset by a reduction of BlackRock’s distribution and servicing costs paid to a financial intermediary. BlackRock may increase or decrease the level of Yield Support waivers in future periods.
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. 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 accounts maintained by BlackRock Life Limited are lent to third parties under global master securities lending agreements. In exchange, the Company receives legal title to the 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. 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. The Company records on the condensed consolidated statements of financial condition the cash and noncash collateral received under these BlackRock Life Limited securities lending arrangements as its own asset in addition to an equal and offsetting collateral liability for the obligation to return the collateral. The securities lending revenue earned from lending securities held by the separate accounts is included in investment advisory, administration fees and securities lending revenue on the condensed consolidated statements of income. During the six months ended June 30, 2017 and 2016, the Company had not resold or repledged any of the collateral received under these arrangements. At June 30, 2017 and December 31, 2016, the fair value of loaned securities held by separate accounts was approximately $23.8 billion and $25.7 billion, respectively, and the fair value of the collateral held under these securities lending agreements was approximately $26.3 billion and $27.8 billion, respectively.
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 guidance also changes the accounting for certain contract costs and revises the criteria for determining if an entity is acting as a principal or agent in certain arrangements. The Company continues to evaluate the impact of ASU 2014-09 on the presentation and recognition of its revenue contracts and certain contract costs. The most significant change identified to date relates to the presentation of certain distribution costs, which are currently presented net against revenues (contra-revenue) and will likely be presented as an expense on a gross basis. The Company will adopt ASU 2014-09 upon its effective date of January 1, 2018, together with all amending ASUs, and is currently evaluating which transition method it will apply. Recognition and Measurement of Financial Instruments . In January 2016, the FASB issued ASU 2016-01, (“ASU 2016-01”). ASU 2016-01 amends guidance on the classification and measurement of financial instruments, including significant revisions in accounting related to the classification and measurement of investments in equity securities and presentation of certain fair value changes for financial liabilities when the fair value option is elected. ASU 2016-01 also amends certain disclosure requirements associated with the fair value of financial instruments. ASU 2016-01 is effective for the Company on January 1, 2018. In the period of adoption, the Company is required to reclassify the unrealized gains/losses on equity securities within accumulated other comprehensive income to retained earnings, which is not expected to be material to the condensed consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, (“ASU 2016-02”), which requires lessees to recognize assets and liabilities arising from most operating leases on the statement of financial condition. The Company expects to record assets and liabilities for its current operating leases upon adoption of ASU 2016-02 and does not expect the adoption to have a material impact on its results of operations or cash flows. ASU 2016-02 is effective for the Company on January 1, 2019, and the Company intends to apply the practical expedients allowed by the standard upon transition. See Note 13 of the 2016 Form 10-K for information on the Company’s operating lease commitments. Cash Flow Classification. In August 2016, the FASB issued ASU 2016-15, (“ASU 2016-15”), which amends and clarifies the current guidance to reduce diversity in practice of the classification of certain cash receipts and payments in the statement of cash flows. The Company is currently evaluating the impact of adopting ASU 2016-15, which is effective for the Company on January 1, 2018 with early adoption permitted. The Company must apply the guidance retrospectively to all periods presented.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
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: June 30, December 31, (in millions) 2017 2016 Available-for-sale investments $ 103 $ 80 Held-to-maturity investments 74 51 Trading investments: Consolidated sponsored investment funds 503 465 Other equity and debt securities 164 101 Deferred compensation plan mutual funds 52 59 Total trading investments 719 625 Other investments: Equity method investments (1) 935 730 Cost method investments (2) 92 91 Carried interest (3) 19 18 Total other investments 1,046 839 Total investments $ 1,942 $ 1,595 (1) Equity method investments primarily include BlackRock’s direct investments in certain BlackRock sponsored investment funds. ( 2 ) Amounts include nonmarketable securities, primarily Federal Reserve Bank stock, which is held for regulatory purposes and is restricted from sale. At June 30, 2017 and December 31, 2016, there were no indicators of impairment on these investments. (3 ) Carried interest of consolidated sponsor investment funds accounted for as voting rights entities (“VREs”) 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.
Summary of Cost and Carrying Value of Trading Investments	A summary of the cost and carrying value of trading investments is as follows: June 30, December 31, (in millions) 2017 2016 Cost Carrying Value Cost Carrying Value Trading investments: Deferred compensation plan mutual funds $ 34 $ 52 $ 41 $ 59 Equity securities/multi-asset mutual funds 374 408 290 308 Debt securities/fixed income mutual funds: Corporate debt 174 179 128 128 Government debt 30 30 60 60 Asset/mortgage backed debt 49 50 70 70 Total trading investments $ 661 $ 719 $ 589 $ 625

Consolidated Voting Rights En31

Consolidated Voting Rights Entities (Tables)	6 Months Ended
	Jun. 30, 2017
Text Block [Abstract]
Consolidated VREs Included in Condensed Consolidated Statements of Financial Condition	The following table presents the balances related to these consolidated VREs that were recorded on the condensed consolidated statements of financial condition, including BlackRock’s net interest in these funds: June 30, December 31, (in millions) 2017 2016 Cash and cash equivalents $ 86 $ 53 Trading investments 503 465 Other assets 29 15 Other liabilities (51 ) (50 ) Noncontrolling interests (77 ) (39 ) BlackRock’s net interests in consolidated VREs $ 490 $ 444

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2017
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Schedule of VIE Assets and Liabilities	Consolidated VIE assets and liabilities are presented after intercompany eliminations in the following table: June 30, December 31, (in millions) 2017 2016 Assets of consolidated VIEs: Cash and cash equivalents $ 74 $ 84 Investments 1,194 1,008 Other assets 50 63 Total investments and other assets 1,244 1,071 Liabilities of consolidated VIEs (295 ) (216 ) Noncontrolling interests (255 ) (207 ) BlackRock's net interests in consolidated VIEs $ 768 $ 732
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Schedule of VIE Assets and Liabilities	At June 30, 2017 and December 31, 2016, the Company’s carrying value of assets and liabilities included on the condensed consolidated statements of financial condition pertaining to nonconsolidated VIEs and its maximum risk of loss related to VIEs for which it held a variable interest, but for which it was not the PB, was as follows: (in millions) At June Investments Advisory Fee Receivables Other Net Assets (Liabilities) Maximum Risk (1) Sponsored investment products $ 228 $ 12 $ (7 ) $ 257 At December Sponsored investment products $ 171 $ 9 $ (8 ) $ 197 (1) At both June 30, 2017 and December 31, 2016, BlackRock’s maximum risk of loss associated with these VIEs primarily related to BlackRock’s investments and the collection of advisory fee receivables.

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Investments Measured at Other Assets Not Held at June 30, (in millions) (Level 1) (Level 2) (Level 3) NAV (1) Fair Value (2) 2017 Assets: Investments Available-for-sale $ 8 $ 72 $ 23 $ — $ — $ 103 Held-to-maturity securities — — — — 74 74 Trading: . Deferred compensation plan mutual funds 52 — — — — 52 Equity securities/Multi-asset mutual funds 408 — — — — 408 Debt securities / fixed income mutual funds 1 254 4 — — 259 Total trading 461 254 4 — — 719 Other investments: Equity method: Equity and fixed income mutual funds 305 — — 10 — 315 Other — — — 609 11 620 Total equity method 305 — — 619 11 935 Cost method investments — — — — 92 92 Carried interest — — — — 19 19 Total investments 774 326 27 619 196 1,942 Separate account assets 112,370 33,545 — — 973 146,888 Separate account collateral held under securities lending agreements: Equity securities 20,733 — — — — 20,733 Debt securities — 5,536 — — — 5,536 Total separate account collateral held under securities lending agreements 20,733 5,536 — — — 26,269 Investments of consolidated VIEs: Private / public equity (3) 5 5 113 77 80 280 Equity securities 300 — — — — 300 Debt securities — 316 — — — 316 Other — — — 64 — 64 Carried interest — — — — 234 234 Total investments of consolidated VIEs 305 321 113 141 314 1,194 Total $ 134,182 $ 39,728 $ 140 $ 760 $ 1,483 $ 176,293 Liabilities: Separate account collateral liabilities under securities lending agreements $ 20,733 $ 5,536 $ — $ — $ — $ 26,269 Other liabilities (4) — 7 218 — — 225 Total $ 20,733 $ 5,543 $ 218 $ — $ — $ 26,494 (1) Amounts are comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) 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 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. (3) Level 3 amounts primarily include direct investments in private equity companies held by private equity funds. (4) Amounts primarily include recorded contingent liabilities related to certain acquisitions (see Note 11, Commitments and Contingencies Assets and liabilities measured at fair value on a recurring basis and other assets not held at fair value December 31, 2016 (in millions) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investments Measured at NAV (1) Other Assets Not Held at Fair Value (2) December 31, 2016 Assets: Investments Available-for-sale $ 7 $ 49 $ 24 $ — $ — $ 80 Held-to-maturity securities — — — — 51 51 Trading: Deferred compensation plan mutual funds 59 — — — — 59 Equity/Multi-asset mutual funds 308 — — — — 308 Debt securities / fixed income mutual funds 1 250 7 — — 258 Total trading 368 250 7 — — 625 Other investments: Equity method: Equity and fixed income mutual funds 323 — — 5 — 328 Other — — — 394 8 402 Total equity method 323 — — 399 8 730 Cost method investments — — — — 91 91 Carried interest — — — — 18 18 Total investments 698 299 31 399 168 1,595 Separate account assets 109,663 38,542 — — 884 149,089 Separate account collateral held under securities lending agreements: Equity securities 22,173 — — — — 22,173 Debt securities — 5,619 — — — 5,619 Total separate account collateral held under securities lending agreements 22,173 5,619 — — — 27,792 Investments of consolidated VIEs: Private / public equity (3) 3 2 112 89 79 285 Equity securities 278 — — — — 278 Debt securities — 274 — — — 274 Other — — — 63 — 63 Carried interest — — — — 108 108 Total investments of consolidated VIEs 281 276 112 152 187 1,008 Total $ 132,815 $ 44,736 $ 143 $ 551 $ 1,239 $ 179,484 Liabilities: Separate account collateral liabilities under securities lending agreements $ 22,173 $ 5,619 $ — $ — $ — $ 27,792 Other liabilities (4) — 7 115 — — 122 Total $ 22,173 $ 5,626 $ 115 $ — $ — $ 27,914 (1) Amounts are comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) 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 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. (3) Level 3 amounts include direct investments in private equity companies held by private equity funds. (4) Amounts primarily include recorded contingent liabilities related to certain acquisitions (see Note 11, Commitments and Contingencies
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 June 30, 2017 (in millions) March 31, 2017 Realized and Unrealized Gains (Losses) in Earnings and OCI Purchases Sales and Maturities Issuances and other Settlements (1) Transfers into Level 3 Transfers out of Level 3 June 30, 2017 Total Net Unrealized Gains (Losses) Included in Earnings (2) Assets: Investments: Available-for-sale securities (3) $ — $ — $ 23 $ — $ — $ — $ — $ 23 Trading — — 4 — — — — 4 Total investments — — 27 — — — — 27 Assets of consolidated VIEs - Private equity 113 — — — — — — 113 Total Level 3 assets $ 113 $ — $ 27 $ — $ — $ — $ — $ 140 Liabilities: Other liabilities (4) $ 113 $ 3 $ — $ — $ 108 $ — $ — $ 218 $ 3 (1) ( 2 ) Earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at the reporting date. ( 3 ) Amounts include investments in CLOs. ( 4 ) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Six Months Ended June 30, 2017 (in millions) December 31, 2016 Realized and Unrealized Gains (Losses) in Earnings and OCI Purchases Sales and Maturities Issuances and other Settlements (1) Transfers into Level 3 Transfers out of Level 3 (2) June 30, 2017 Total Net Unrealized Gains (Losses) Included in Earnings (3) Assets: Investments: Available-for-sale securities (4) $ 24 $ — $ 23 $ — $ — $ — $ (24 ) $ 23 Trading 7 — 4 — — — (7 ) 4 Total investments 31 — 27 — — — (31 ) 27 Assets of consolidated VIEs - Private equity 112 1 — — — — 113 $ 1 Total Level 3 assets $ 143 $ 1 $ 27 $ — $ — $ — $ (31 ) $ 140 Liabilities: Other liabilities (5) $ 115 $ 5 $ — $ — $ 108 $ — $ — $ 218 $ 5 (1) (2) (3) (4) Amounts include investments in CLOs. (5) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended June 30, 2016 (in millions) March 31, 2016 Realized and Unrealized Gains (Losses) in Earnings and OCI Purchases Sales and Maturities Issuances and other Settlements (1) Transfers into Level 3 Transfers out of Level 3 June 30, 2016 Total Net Unrealized Gains (Losses) Included in Earnings (2) Assets: Investments: Available-for-sale securities (3) $ 23 $ — $ — $ — $ — $ — $ (23 ) $ — Trading 4 — — — — — (1 ) 3 Total investments 27 — — — — — (24 ) 3 Assets of consolidated VIEs - Private equity 192 — — (3 ) — — — 189 Total Level 3 assets $ 219 $ — $ — $ (3 ) $ — $ — $ (24 ) $ 192 Liabilities: Other liabilities (4) $ 49 $ 3 $ — $ — $ 75 $ — $ — $ 121 $ 3 (1) ® ( 2 ) Earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at the reporting date. ( 3 ) Amounts include investments in CLOs. ( 4 ) Other liabilities amount includes contingent liabilities in connection with certain acquisitions. Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Six Months Ended June 30, 2016 December 31, Realized and Unrealized Gains (Losses) in Earnings Sales and Issuances and other Transfers into Transfers out of June 30, Total Net Unrealized Gains (Losses) Included in (in millions) 2015 and OCI Purchases Maturities Settlements (1) Level 3 Level 3 2016 Earnings (2) Assets: Investments Available-for-sale securities (3) $ 23 $ — $ 23 $ — $ — $ — $ (46 ) $ — Trading 2 — 4 — — — (3 ) 3 Total investments 25 — 27 — — — (49 ) 3 Assets of consolidated VIEs - Private equity 196 2 — (9 ) — — — 189 $ 2 Total Level 3 assets $ 221 $ 2 $ 27 $ (9 ) $ — $ — $ (49 ) $ 192 Liabilities: Other liabilities (4) $ 48 $ 2 $ — $ — $ 75 $ — $ — $ 121 $ 2 (1) (2) Earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at the reporting date. (3) Amounts include investments in CLOs. (4) Other liabilities amount includes contingent liabilities in connection with certain acquisitions.
Fair Value of Financial Assets and Financial Liabilities	Disclosures of Fair Value for Financial Instruments Not Held at Fair Value . At June 30, 2017 and December 31, 2016, the fair value of the Company’s financial instruments not held at fair value are categorized in the table below: June 30, 2017 December 31, 2016 (in millions) Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Fair Value Hierarchy Financial Assets: Cash and cash equivalents $ 5,508 $ 5,508 $ 6,091 $ 6,091 Level 1 (1) (2) Accounts receivable 2,984 2,984 2,350 2,350 Level 1 (3) Cash and cash equivalents of consolidated VIEs 74 74 84 84 Level 1 (1) (2) Other assets 60 60 25 25 Level 1 (1) (4) Financial Liabilities: Accounts payable and accrued liabilities 1,520 1,520 1,094 1,094 Level 1 (3) Long-term borrowings 4,970 5,225 4,915 5,165 Level 2 (5) (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 June 30, 2017 and December 31, 2016, approximately $136 million and $132 million, respectively, of money market funds were recorded within cash and cash equivalents on the condensed consolidated statements of financial condition. In addition, at June 30, 2017 and December 31, 2016, approximately $21 million and $13 million, respectively, of money market funds were recorded within cash and cash equivalents of consolidated VIEs. Money market funds are valued based on quoted market prices, or $1.00 per share, which generally is the NAV of the fund. (3) The carrying amounts of accounts receivable, accounts payable and accrued liabilities approximate fair value due to their short-term nature. (4) Other assets primarily include restricted cash. (5 ) Long-term borrowings are recorded at amortized cost net of debt issuance costs. 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 June 2017 and December 2016, respectively. See Note 10, Borrowings
Investments in Certain Entities that 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 equivalent). June 30, 2017 (in millions) Ref Fair Value Total Unfunded Commitments Redemption Frequency Redemption Notice Period Equity method: (1) Hedge funds/funds of hedge funds (a) $ 253 $ 11 Daily/Monthly (21%) Quarterly (54%) N/R (25%) 1 – 90 days Private equity funds (b) 87 67 N/R N/R Real assets funds (c) 261 113 Quarterly (86%) N/R (14%) 60 days Other 18 22 Daily/Monthly (62%) N/R (38%) 3 – 5 days Consolidated VIEs: Private equity funds of funds (d) 77 20 N/R N/R Hedge fund (a) 22 — Quarterly 90 days Real assets funds (c) 42 54 N/R N/R Total $ 760 $ 287 December 31, 2016 (in millions) Ref Fair Value Total Unfunded Commitments Redemption Frequency Redemption Notice Period Equity method: (1) Hedge funds/funds of hedge funds (a) $ 237 $ 14 Daily/Monthly (21%) Quarterly (51%) N/R (28%) 1 – 90 days Private equity funds (b) 90 62 N/R N/R Real assets funds (c) 60 35 Quarterly (41%) N/R (59%) 60 days Other 12 9 Daily/Monthly (42%) N/R (58%) 3 – 5 days Consolidated VIEs: Private equity funds of funds (d) 89 16 N/R N/R Hedge fund (a) 36 — Quarterly 90 days Real assets funds (c) 27 21 N/R N/R Total $ 551 $ 157 N/R – not redeemable (1) Comprised of equity method investments, which include investments in 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 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 six years at June 30, 2017 and approximately one year at December 31, 2016. (b) 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 five (c) This category includes several real assets funds that invest directly in real estate, real estate related assets and infrastructure. The fair values of the investments have been estimated using capital accounts representing the Company’s ownership interest in the funds. The Company’s investments that are not subject to redemption or are not currently redeemable are normally returned through distributions as a result of the liquidation of the underlying assets of the funds. It is estimated that the investments in these funds not subject to redemptions will be liquidated over a weighted-average period of approximately eight years at June 30, 2017 and six years at December 31, 2016. The total remaining unfunded commitments to other third-party funds were $167 million and $56 million at June 30, 2017 and December 31, 2016, respectively. The Company had contractual obligations to the consolidated funds of $137 million at both June 30, 2017 and $56 million at December 31, 2016. ( d )

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill Activity	Goodwill activity during the six months ended June 30, 2017 was as follows: (in millions) December 31, 2016 $ 13,118 Acquisition (1) 91 Goodwill adjustments related to Quellos (2) (10 ) June 30, 2017 $ 13,199 (1) Amount represents goodwill in connection with the First Reserve Transaction, which expanded the Company’s energy and power infrastructure platform. Total consideration included $120 million of contingent consideration at fair value at time of close. (2) The decrease in goodwill during the six months ended June 30, 2017 primarily 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 $184 million and $200 million at June 30, 2017 and December 31, 2016, respectively

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
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 December 31, 2016 $ 17,178 $ 185 $ 17,363 Amortization expense — (50 ) (50 ) Acquisition (1) — 110 110 June 30, 2017 $ 17,178 $ 245 $ 17,423 (1)

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Carrying Value and Fair Value of Long-Term Borrowings	The carrying value and fair value of long-term borrowings estimated using market prices and foreign exchange rates at June 30, 2017 included the following: (in millions) Maturity Amount Unamortized Discount and Debt Issuance Costs Carrying Value Fair Value 5.00% Notes due 2019 $ 1,000 $ (1 ) $ 999 $ 1,074 4.25% Notes due 2021 750 (4 ) 746 805 3.375% Notes due 2022 750 (4 ) 746 780 3.50% Notes due 2024 1,000 (6 ) 994 1,050 1.25% Notes due 2025 798 (6 ) 792 809 3.20% Notes due 2027 700 (7 ) 693 707 Total Long-term Borrowings $ 4,998 $ (28 ) $ 4,970 $ 5,225

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Commitments of Annual Base Rental Payments under Operating Lease	Future minimum commitments of annual base rental payments under this operating lease are as follows: (in millions) Year Amount 2023 $ 34 2024 51 2025 51 2026 51 2027 51 Thereafter 1,007 Total $ 1,245

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Restricted Stock and RSU Activity	Restricted Stock and RSUs. Restricted stock and restricted stock units (“RSUs”) activity for the six months ended June 30, 2017 is summarized below. Outstanding at Restricted Stock and RSUs Weighted- Average Grant Date Fair Value December 31, 2016 2,987,588 $ 318.04 Granted 1,032,221 $ 375.93 Converted (1,294,073 ) $ 319.78 Forfeited (30,438 ) $ 338.43 June 30, 2017 (1) 2,695,298 $ 339.14 (1) At June 30, 2017, approximately 2.4 million awards are expected to vest and 0.3 million awards have vested but have not been converted.
Performance-Based RSUs [Member]
Restricted Stock and RSU Activity	Performance-based RSU activity for the six months ended June 30, 2017 is summarized below. Outstanding at Performance- Based RSUs Weighted- Average Grant Date Fair Value December 31, 2016 610,371 $ 315.65 Granted 294,584 $ 375.27 Forfeited (1,430 ) $ 296.12 June 30, 2017 903,525 $ 335.12
Market Performance-Based RSUs [Member]
Restricted Stock and RSU Activity	Market Performance-based RSUs. Market performance-based RSUs activity for the six months ended June 30, 2017 is summarized below. Outstanding at Market Performance- Based RSUs Weighted- Average Grant Date Fair Value December 31, 2016 803,474 $ 151.20 Converted (517,138 ) $ 126.76 June 30, 2017 (1) 286,336 $ 195.33 (1)

Accumulated Other Comprehensi39

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss)	The following tables present changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2017 and 2016: (in millions) Foreign currency translation adjustments (1) Other (2) Total For the Three Months Ended June 30, 2017 March 31, 2017 $ (681 ) $ 4 $ (677 ) Net other comprehensive income (loss) for the three months ended June 30, 2017 102 — 102 June 30, 2017 $ (579 ) $ 4 $ (575 ) For the Six Months Ended June 30, 2017 December 31, 2016 $ (721 ) $ 5 $ (716 ) Net other comprehensive income (loss) for the six months ended June 30, 2017 142 (1 ) 141 June 30, 2017 $ (579 ) $ 4 $ (575 ) (1) Amount for the three and six months ended June 30, 2017 includes a loss from a net investment hedge of $31 million (net of a tax benefit of $18 million) and $38 million (net of a tax benefit of $22 million), respectively. (2) (in millions) Foreign currency translation adjustments (1) Other (2) Total For the Three Months Ended June 30, 2016 March 31, 2016 $ (478 ) $ 4 $ (474 ) Net other comprehensive income (loss) for the three months ended June 30, 2016 (87 ) 1 (86 ) June 30, 2016 $ (565 ) $ 5 $ (560 ) For the Six Months Ended June 30, 2016 December 31, 2015 $ (452 ) $ 4 $ (448 ) Net other comprehensive income (loss) for the six months ended June 30, 2016 (113 ) 1 (112 ) June 30, 2016 $ (565 ) $ 5 $ (560 ) ( 1) ( 2 )

Capital Stock (Tables)

Capital Stock (Tables)	6 Months Ended
	Jun. 30, 2017
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: June 30, December 31, 2017 2016 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 (1) 823,188 823,188 Series C Shares authorized, $0.01 par value 6,000,000 6,000,000 Shares issued and outstanding (1) 246,522 763,660 Series D Shares authorized, $0.01 par value 20,000,000 20,000,000 Shares issued and outstanding — — (1) Shares held by PNC.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
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 six months ended June 30, 2017 and 2016 under the treasury stock method: Three Months Ended Six Months Ended June 30, June 30, (in millions, except shares and per share data) 2017 2016 2017 2016 Net income attributable to BlackRock $ 857 $ 789 $ 1,719 $ 1,446 Basic weighted-average shares outstanding 162,502,465 164,758,612 162,758,112 165,073,371 Dilutive effect of nonparticipating RSUs and stock options 1,647,396 1,880,678 1,786,648 1,950,188 Total diluted weighted-average shares outstanding 164,149,861 166,639,290 164,544,760 167,023,559 Basic earnings per share $ 5.27 $ 4.79 $ 10.56 $ 8.76 Diluted earnings per share $ 5.22 $ 4.73 $ 10.45 $ 8.66

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Schedule of Investment Advisory, Administration Fees, Securities Lending Revenue and Performance Fees, Technology and Risk Management Revenue, Distribution Fees, and Advisory and Other Revenue	The following table illustrates investment advisory, administration fees, securities lending revenue and performance fees by product type, technology and risk management revenue, distribution fees, and advisory and other revenue for the three and six months ended June 30, 2017 and 2016. Three Months Ended Six Months Ended June 30, June 30, (in millions) 2017 2016 2017 2016 Equity $ 1,378 $ 1,278 $ 2,677 $ 2,462 Fixed income 713 657 1,404 1,280 Multi-asset 289 293 566 580 Alternatives 206 216 412 412 Cash management 137 119 264 222 Total investment advisory, administration fees, securities lending revenue and performance fees 2,723 2,563 5,323 4,956 Technology and risk management revenue 164 146 322 287 Distribution fees 5 11 12 22 Advisory and other revenue 73 84 132 163 Total revenue $ 2,965 $ 2,804 $ 5,789 $ 5,428
Total Revenue by Geographic Region	The following table illustrates total revenue for the three and six months ended June 30, 2017 and 2016 by geographic region. These amounts are aggregated on a legal entity basis and do not necessarily reflect where the customer resides or affiliated services are provided. Three Months Ended Six Months Ended (in millions) June 30, June 30, Revenue 2017 2016 2017 2016 Americas $ 2,012 $ 1,876 $ 3,951 $ 3,646 Europe 803 792 1,550 1,514 Asia-Pacific 150 136 288 268 Total revenue $ 2,965 $ 2,804 $ 5,789 $ 5,428
Schedule of Long-Lived Assets by Geographic Region	The following table illustrates long-lived assets that consist of goodwill and property and equipment at June 30, 2017 and December 31, 2016 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) June 30, December 31, Long-lived Assets 2017 2016 Americas $ 13,498 $ 13,424 Europe 163 163 Asia-Pacific 87 90 Total long-lived assets $ 13,748 $ 13,677

Business Overview - Additional

Business Overview - Additional Information (Detail) - PNC [Member]	Jun. 30, 2017
Related Party Transaction [Line Items]
Percentage of common stock of parent owned	21.30%
Percentage of capital stock of parent owned	21.80%

Significant Accounting Polici44

Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Reduction of management fees	$ 0		$ 13	$ 6	$ 25
Percentage of Yield Support waivers offset				0.00%	60.00%
Fair value of loaned securities	23,800			$ 23,800		$ 25,700
Fair value of collateral held for loan securities	$ 26,269			$ 26,269		$ 27,792
Minimum [Member]
Significant Accounting Policies [Line Items]
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk	102.00%			102.00%
Maximum [Member]
Significant Accounting Policies [Line Items]
Collateral cash and securities received in exchange of value of securities lent in order to reduce counterparty risk	112.00%			112.00%
Adjustments for New Accounting Pronouncement -ASU 2016-09 [Member]
Significant Accounting Policies [Line Items]
Discrete income tax benefit for vested stock awards		$ 81

Investments - Summary of Carryi

Investments - Summary of Carrying Value of Total Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Available-for-sale investments	$ 103	$ 80
Held-to-maturity investments	74	51
Total trading investments	719	625
Total Other Investments, Carrying Value	1,046	839
Total investments	1,942	1,595
Consolidated Sponsored Investment Funds [Member]
Investment [Line Items]
Total trading investments	503	465
Other Equity and Debt Securities [Member]
Investment [Line Items]
Total trading investments	164	101
Deferred Compensation Plan Fund [Member]
Investment [Line Items]
Total trading investments	52	59
Consolidated Entities [Member] | Carried Interest [Member]
Investment [Line Items]
Total Other Investments, Carrying Value	19	18
Equity Method Investments [Member]
Investment [Line Items]
Total Other Investments, Carrying Value	935	730
Cost Method Investments [Member]
Investment [Line Items]
Total Other Investments, Carrying Value	$ 92	$ 91

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Held-to-maturity investments	$ 74	$ 51
Foreign government debt, after five years through ten years	11
Held-to-maturity investments, after ten years	63
Total trading investments	$ 719	$ 625
PennyMac [Member]
Investment [Line Items]
Ownership percentage	20.00%	20.00%
Shares and units	16	16
Carrying value - equity method investment	$ 317	$ 301
Fair value of equity method investments	260	259
Consolidated Sponsored Investment Funds [Member]
Investment [Line Items]
Total trading investments	503	465
Deferred Compensation Plan Fund [Member]
Investment [Line Items]
Total trading investments	52	59
Equity and Debt Securities Held in Separate Investment Accounts [Member]
Investment [Line Items]
Total trading investments	164	101
Consolidated Entities [Member] | Consolidated Sponsored Investment Funds [Member]
Investment [Line Items]
Trading securities, debt	242	246
Trading securities, equity	$ 261	$ 219

Investments - Summary of Cost a

Investments - Summary of Cost and Carrying Value of Trading Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Trading investments, Cost	$ 661	$ 589
Trading investments, Carrying Value	719	625
Deferred Compensation Plan Fund [Member]
Schedule of Investments [Line Items]
Trading investments, Cost	34	41
Trading investments, Carrying Value	52	59
Equity Securities/Multi-Asset Mutual Funds [Member]
Schedule of Investments [Line Items]
Trading investments, Cost	374	290
Trading investments, Carrying Value	408	308
Corporate Debt [Member]
Schedule of Investments [Line Items]
Trading investments, Cost	174	128
Trading investments, Carrying Value	179	128
Government Debt [Member]
Schedule of Investments [Line Items]
Trading investments, Cost	30	60
Trading investments, Carrying Value	30	60
Asset/Mortgage Backed Debt [Member]
Schedule of Investments [Line Items]
Trading investments, Cost	49	70
Trading investments, Carrying Value	$ 50	$ 70

Consolidated VREs Recorded in C

Consolidated VREs Recorded in Condensed Consolidated Statements of Financial Condition (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Consolidated Sponsored Investment Funds [Line Items]
Cash and cash equivalents	$ 5,508	$ 6,091	$ 5,065	$ 6,083
Trading investments	719	625
Other assets	1,408	1,065
Other liabilities	(1,538)	(1,007)
Noncontrolling interests	(61)	(52)
Consolidated Voting Rights Entities [Member]
Consolidated Sponsored Investment Funds [Line Items]
Cash and cash equivalents	86	53
Trading investments	503	465
Other assets	29	15
Other liabilities	(51)	(50)
Noncontrolling interests	(77)	(39)
BlackRock’s net interests in consolidated VREs	$ 490	$ 444

Variable Interest Entities Refl

Variable Interest Entities Reflects adoption of ASU 2015-12 - Schedule of VIE Assets and Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 5,508	$ 6,091	$ 5,065	$ 6,083
Investments	1,942	1,595
Other assets	1,408	1,065
Liabilities of consolidated VIEs	(187,601)	(190,833)
Noncontrolling interests	(61)	(52)
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	74	84
Investments	1,194	1,008
Other assets	50	63
Total investments and other assets	1,244	1,071
Liabilities of consolidated VIEs	(295)	(216)
Noncontrolling interests	(255)	(207)
BlackRock's net interests in consolidated VIEs	$ 768	$ 732

Variable Interest Entities Re50

Variable Interest Entities Reflects adoption of ASU 2015-12 - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Net income (loss) attributable to noncontrolling interests	$ 10	$ 6	$ 19	$ (4)
Nonoperating net gain (loss)	36	20	87	18
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Net income (loss) attributable to noncontrolling interests	33	13	66	15
Nonoperating net gain (loss)	12	$ 3	18	$ (3)
Variable Interest Entity, Not Primary Beneficiary [Member] | Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Net assets of investments funds	$ 5,000		$ 5,000		$ 4,000

Variable Interest Entities Re51

Variable Interest Entities Reflects adoption of ASU 2015-12 - Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary (Detail) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Investments [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	$ 228,000,000	$ 171,000,000
Advisory Fee Receivables [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	12,000,000	9,000,000
Other Net Assets (Liabilities) [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	(7,000,000)	(8,000,000)
Maximum Risk of Loss [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	$ 257,000,000	$ 197,000,000

Fair Value Disclosures - Assets

Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total available-for-sale	$ 103	$ 80
Total trading investments	719	625
Separate account assets	146,888	149,089
Fair value of collateral held for loan securities	26,269	27,792
Equity Securities/Multi-Asset Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	408	308
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total available-for-sale	103	80
Held-to-maturity securities	74	51
Total trading investments	719	625
Total equity method	935	730
Cost method investments	92	91
Carried interest	19	18
Total investments	1,942	1,595
Separate account assets	146,888	149,089
Fair value of collateral held for loan securities	26,269	27,792
Total investments of consolidated VIEs	1,194	1,008
Total	176,293	179,484
Separate account collateral liabilities under securities lending agreements	26,269	27,792
Other liabilities	225	122
Total liabilities measured at fair value	26,494	27,914
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-asset Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	408	308
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 investments	259	258
Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	280	285
Fair Value, Measurements, Recurring [Member] | Equity And Fixed Income Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	315	328
Fair Value, Measurements, Recurring [Member] | Other Types Of Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	620	402
Total investments of consolidated VIEs	64	63
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 investments	52	59
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total available-for-sale	8	7
Total trading investments	461	368
Total equity method	305	323
Total investments	774	698
Separate account assets	112,370	109,663
Fair value of collateral held for loan securities	20,733	22,173
Total investments of consolidated VIEs	305	281
Total	134,182	132,815
Separate account collateral liabilities under securities lending agreements	20,733	22,173
Total liabilities measured at fair value	20,733	22,173
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities/Multi-asset Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	408	308
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	1	1
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Private/ Public Equity [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	5	3
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity And Fixed Income Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	305	323
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Deferred Compensation Plan Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	52	59
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total available-for-sale	72	49
Total trading investments	254	250
Total investments	326	299
Separate account assets	33,545	38,542
Fair value of collateral held for loan securities	5,536	5,619
Total investments of consolidated VIEs	321	276
Total	39,728	44,736
Separate account collateral liabilities under securities lending agreements	5,536	5,619
Other liabilities	7	7
Total liabilities measured at fair value	5,543	5,626
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	254	250
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private/ Public Equity [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	5	2
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total available-for-sale	23	24
Total trading investments	4	7
Total investments	27	31
Total investments of consolidated VIEs	113	112
Total	140	143
Other liabilities	218	115
Total liabilities measured at fair value	218	115
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total trading investments	4	7
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private/ Public Equity [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	113	112
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of collateral held for loan securities	20,733	22,173
Total investments of consolidated VIEs	300	278
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of collateral held for loan securities	20,733	22,173
Total investments of consolidated VIEs	300	278
Fair Value, Measurements, Recurring [Member] | Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of collateral held for loan securities	5,536	5,619
Total investments of consolidated VIEs	316	274
Fair Value, Measurements, Recurring [Member] | Debt Securities | Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of collateral held for loan securities	5,536	5,619
Total investments of consolidated VIEs	316	274
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	234	108
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	619	399
Total investments	619	399
Total investments of consolidated VIEs	141	152
Total	760	551
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member] | Private/ Public Equity [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	77	89
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member] | Equity And Fixed Income Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	10	5
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member] | Other Types Of Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	609	394
Total investments of consolidated VIEs	64	63
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]
Held-to-maturity securities	74	51
Total equity method	11	8
Cost method investments	92	91
Carried interest	19	18
Total investments	196	168
Separate account assets	973	884
Total investments of consolidated VIEs	314	187
Total	1,483	1,239
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 investments of consolidated VIEs	80	79
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Other Types Of Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total equity method	11	8
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Carried Interest [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments of consolidated VIEs	$ 234	$ 108

Fair Value Disclosures - Additi

Fair Value Disclosures - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Significant Unobservable Inputs (Level 3) [Member] | Private/ Public Equity [Member] | Consolidated Variable Interest Entities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total investments	$ 113	$ 112

Fair Value Disclosures - Change

Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value, beginning balance	$ 113	$ 219	$ 143	$ 221
Realized and Unrealized Gains (Losses) in Earnings and OCI, Assets			1	2
Purchases, Assets	27		27	27
Sales and Maturities, Assets		(3)		(9)
Transfers out of Level 3, Assets		(24)	(31)	(49)
Assets measured at fair value, ending balance	140	192	140	192
Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value, beginning balance		23	24	23
Purchases, Assets	23		23	23
Transfers out of Level 3, Assets		(23)	(24)	(46)
Assets measured at fair value, ending balance	23		23
Consolidated Variable Interest Entities [Member] | Other Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities measured at fair value, beginning balance	113	49	115	48
Realized and Unrealized Gains (Losses) in Earnings and OCI, Liabilities	3	3	5	2
Issuances and other Settlements, Liabilities	108	75	108	75
Liabilities measured at fair value, ending balance	218	121	218	121
Total Net Unrealized Gains (Losses) Included in Earnings	3	3	5	2
Consolidated Variable Interest Entities [Member] | Private/ Public Equity [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value, beginning balance	113	192	112	196
Realized and Unrealized Gains (Losses) in Earnings and OCI, Assets			1	2
Sales and Maturities, Assets		(3)		(9)
Assets measured at fair value, ending balance	113	189	113	189
Total Net Unrealized Gains (Losses) Included in Earnings			1	2
Trading [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value, beginning balance		4	7	2
Purchases, Assets	4		4	4
Transfers out of Level 3, Assets		(1)	(7)	(3)
Assets measured at fair value, ending balance	4	3	4	3
Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets measured at fair value, beginning balance		27	31	25
Purchases, Assets	27		27	27
Transfers out of Level 3, Assets		(24)	(31)	(49)
Assets measured at fair value, ending balance	$ 27	$ 3	$ 27	$ 3

Fair Value Disclosures - Fair V

Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 5,508	$ 6,091	$ 5,065	$ 6,083
Long-term borrowings	4,970	4,915
Consolidated Variable Interest Entities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	74	84
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	5,508	6,091
Accounts receivable	2,984	2,350
Other assets	60	25
Accounts payable and accrued liabilities	1,520	1,094
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings	4,970	4,915
Carrying Amount [Member] | Consolidated Variable Interest Entities [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	74	84
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	5,508	6,091
Accounts receivable	2,984	2,350
Other assets	60	25
Accounts payable and accrued liabilities	1,520	1,094
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term borrowings	5,225	5,165
Estimated Fair Value [Member] | Consolidated Variable Interest Entities [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	$ 74	$ 84

Fair Value Disclosures - Fair56

Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 5,508	$ 6,091	$ 5,065	$ 6,083
Money market valuation per share floor	$ 1
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 136	132
Consolidated Variable Interest Entities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	74	84
Consolidated Variable Interest Entities [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 21	$ 13

Fair Value Disclosures - Invest

Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 760	$ 551
Total Unfunded Commitments	287	157
Hedge Funds/Funds of Hedge Funds [Member] | Consolidated Variable Interest Entities [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 22	$ 36
Hedge Funds/Funds of Hedge Funds [Member] | Maximum [Member] | Consolidated Variable Interest Entities [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period, days	90 days	90 days
Real Assets Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Commitments	$ 167	$ 56
Real Assets Funds [Member] | Consolidated Variable Interest Entities [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	42	27
Total Unfunded Commitments	54	21
Private Equity Funds Of Funds [Member] | Consolidated Variable Interest Entities [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	77	89
Total Unfunded Commitments	20	16
Equity Method Investments [Member] | Hedge Funds/Funds of Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	253	237
Total Unfunded Commitments	$ 11	$ 14
Redemption Frequency (Daily)	21.00%	21.00%
Redemption Frequency (Monthly)	21.00%	21.00%
Redemption Frequency (Quarterly)	54.00%	51.00%
Redemption Frequency (Not Redeemable)	25.00%	28.00%
Equity Method Investments [Member] | 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	1 day	1 day
Equity Method Investments [Member] | 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 Investments [Member] | Private Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 87	$ 90
Total Unfunded Commitments	67	62
Equity Method Investments [Member] | Real Assets Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	261	60
Total Unfunded Commitments	$ 113	$ 35
Redemption Frequency (Quarterly)	86.00%	41.00%
Redemption Frequency (Not Redeemable)	14.00%	59.00%
Redemption Notice Period, Not Redeemable	60 days	60 days
Equity Method Investments [Member] | Other Types Of Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 18	$ 12
Total Unfunded Commitments	$ 22	$ 9
Redemption Frequency (Daily)	62.00%	42.00%
Redemption Frequency (Monthly)	62.00%	42.00%
Redemption Frequency (Not Redeemable)	38.00%	58.00%
Equity Method Investments [Member] | Other Types Of Investments [Member] | Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period, days	3 days	3 days
Equity Method Investments [Member] | Other Types Of Investments [Member] | Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period, days	5 days	5 days

Fair Value Disclosures - Inve58

Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Commitments	$ 287	$ 157
Hedge Funds/Funds of Hedge Funds [Member] | Equity Method Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Liquidation period, years	6 years	1 year
Total Unfunded Commitments	$ 11	$ 14
Private Equity Funds [Member] | Equity Method Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Liquidation period, years	5 years	5 years
Total Unfunded Commitments	$ 67	$ 62
Real Assets Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Commitments	167	56
Amount of unfunded commitments contractually obligated to fund	137	56
Real Assets Funds [Member] | Consolidated Variable Interest Entities [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total Unfunded Commitments	$ 54	$ 21
Real Assets Funds [Member] | Equity Method Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption period	8 years	6 years
Total Unfunded Commitments	$ 113	$ 35
Private Equity Funds Of Funds [Member] | Consolidated Variable Interest Entities [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Liquidation period, years	5 years	5 years
Total Unfunded Commitments	$ 20	$ 16
Amount of unfunded commitments contractually obligated to fund	$ 24	$ 24

Derivatives and Hedging - Addit

Derivatives and Hedging - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative maximum risk of loss for credit protection	$ 17	$ 17
Other General and Administration Expense [Member]
Derivative [Line Items]
Foreign currency translation gains (losses)	25	29
Total Return Swaps [Member]
Derivative [Line Items]
Notional value	588	588	$ 572
Total Return Swaps [Member] | Nonoperating Income (Expense) [Member]
Derivative [Line Items]
Amount of gains (losses) recognized in income on derivative instruments	(30)	(64)
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional value			42
Forward Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Notional value	$ 1,200	$ 1,200	$ 107

Goodwill - Goodwill Activity (D

Goodwill - Goodwill Activity (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Goodwill Roll Forward
Beginning balance	$ 13,118
Acquisition	91
Goodwill adjustment related to Quellos	(10)
Ending balance	$ 13,199

Goodwill - Goodwill Activity (P

Goodwill - Goodwill Activity (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Excess of tax goodwill over book goodwill	$ 184	$ 200
First Reserve Transaction [Member]
Goodwill [Line Items]
Contingent consideration at fair value	$ 120

Intangible Assets - Carrying Am

Intangible Assets - Carrying Amounts of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule Of Intangible Assets [Line Items]
Indefinite-lived intangible assets, Beginning balance			$ 17,178
Indefinite-lived intangible assets, Ending balance	$ 17,178		17,178
Finite-lived intangible assets, Beginning balance			185
Finite-lived intangible assets, amortization expense	(25)	$ (25)	(50)	$ (50)
Finite-lived intangible assets, Ending balance	245		245
Intangible assets, Beginning balance			17,363
Intangible assets, Ending balance	$ 17,423		17,423
First Reserve Transaction [Member]
Schedule Of Intangible Assets [Line Items]
Finite-lived intangible assets, acquisition			110
Intangible assets, acquisition			$ 110

Intangible Assets - Carrying 63

Intangible Assets - Carrying Amounts of Identifiable Intangible Assets (Parenthetical) (Detail) - First Reserve Transaction [Member] $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Schedule Of Intangible Assets [Line Items]
Finite-lived intangible assets, acquisition	$ 110
Acquired finite-lived intangible assets weighted-average useful life	9 years

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Borrowings			$ 4,970,000,000		$ 4,970,000,000	$ 4,915,000,000
Fair Value			5,225,000,000		5,225,000,000	$ 5,200,000,000
Amount of debt issued			$ 4,998,000,000		4,998,000,000
Repayment of notes					700,000,000
Unsecured Debt 2027 Notes [Member]
Debt Instrument [Line Items]
Amount of debt issued		$ 700,000,000		$ 700,000,000
Interest rate		3.20%		3.20%
Senior unsecured notes maturity date				Mar. 15, 2027
Approximate annual interest expense		$ 22,000,000
Debt instrument, payment terms			Interest is payable semi-annually on March 15 and September 15 of each year, commencing September 15, 2017
Commercial Paper [Member]
Debt Instrument [Line Items]
Maximum amount available under facility			$ 4,000,000,000		4,000,000,000
Amount outstanding under credit facility			0		0
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unsecured revolving credit facility			4,000,000,000		4,000,000,000
Additional amount available, subject to lender credit approval					1,000,000,000
Maximum amount available under facility			5,000,000,000		5,000,000,000
Amount outstanding under credit facility			$ 0		$ 0
Extended debt instrument maturity date					2022-04
Line of credit facility, covenant terms					The 2017 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
6.25% Notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate			6.25%		6.25%
Repayment of notes	$ 700,000,000
Long-term debt, maturity date	2017-09

Borrowings - Carrying Value and

Borrowings - Carrying Value and Fair Value of Long-Term Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Maturity Amount	$ 4,998
Unamortized Discount and Debt Issuance Costs	(28)
Carrying Value	4,970	$ 4,915
Fair Value	5,225	$ 5,200
5.00% Notes due 2019 [Member]
Debt Instrument [Line Items]
Maturity Amount	1,000
Unamortized Discount and Debt Issuance Costs	(1)
Carrying Value	999
Fair Value	1,074
4.25% Notes due 2021 [Member]
Debt Instrument [Line Items]
Maturity Amount	750
Unamortized Discount and Debt Issuance Costs	(4)
Carrying Value	746
Fair Value	805
3.375% Notes due 2022 [Member]
Debt Instrument [Line Items]
Maturity Amount	750
Unamortized Discount and Debt Issuance Costs	(4)
Carrying Value	746
Fair Value	780
3.50% Notes due 2024 [Member]
Debt Instrument [Line Items]
Maturity Amount	1,000
Unamortized Discount and Debt Issuance Costs	(6)
Carrying Value	994
Fair Value	1,050
1.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Maturity Amount	798
Unamortized Discount and Debt Issuance Costs	(6)
Carrying Value	792
Fair Value	809
3.20% Notes due 2027 [Member]
Debt Instrument [Line Items]
Maturity Amount	700
Unamortized Discount and Debt Issuance Costs	(7)
Carrying Value	693
Fair Value	$ 707

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Apr. 05, 2017USD ($)	Mar. 16, 2016Person	May 31, 2017ft²	Jun. 30, 2017USD ($)
Loss Contingencies [Line Items]
Various capital commitments to fund sponsored investment funds, including funds of private equity funds, real assets funds, opportunistic funds and distressed credit funds				$ 298
Contingent commitments				3
Derivative maximum risk of loss for credit protection				17
Number of former tenants suing BlackRock Parties | Person		3
Securities lending loan balances indemnified				184,800
Collateral for indemnified securities				$ 198,100
Employee 401(k) Plan [Member]
Loss Contingencies [Line Items]
Description of claim sought by former employee under lawsuit complaint				While the complaint does not contain any specific amount in alleged damages, it claims that the purported underperformance and hidden fees cost Plan participants more than $60 million.
Employee 401(k) Plan [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Purported underperformance and hidden fees cost	$ 60
Other Liabilities [Member]
Loss Contingencies [Line Items]
Contingent consideration at fair value				$ 218
First Reserve Transaction [Member]
Loss Contingencies [Line Items]
Contingent consideration at fair value				$ 120
Operating Lease [Member]
Loss Contingencies [Line Items]
Area of office space | ft²			847,000
Operating leases, term of contract			20 years
Expected lease commencement date				May 31, 2023

Commitments and Contingencies67

Commitments and Contingencies - Future Minimum Commitments of Annual Base Rental Payments under Operating Lease (Detail) $ in Millions	Jun. 30, 2017USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,023	$ 34
2,024	51
2,025	51
2,026	51
2,027	51
Thereafter	1,007
Total operating lease minimum commitments	$ 1,245

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock and RSU Activity (Detail) - $ / shares	1 Months Ended	6 Months Ended
	Jan. 31, 2017	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock and RSUs, beginning of period	2,987,588	2,987,588
Restricted Stock and RSUs, Granted		1,032,221
Restricted Stock and RSUs, Converted		(1,294,073)
Restricted Stock and RSUs, Forfeited		(30,438)
Restricted Stock and RSUs, end of period		2,695,298
Weighted-Average Grant Date Fair Value, beginning of period	$ 318.04	$ 318.04
Weighted-Average Grant Date Fair Value, Granted		375.93
Weighted-Average Grant Date Fair Value, Converted		319.78
Weighted-Average Grant Date Fair Value, Forfeited		338.43
Weighted-Average Grant Date Fair Value, end of period		$ 339.14
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock and RSUs, beginning of period	610,371	610,371
Restricted Stock and RSUs, Granted	293,385	294,584
Restricted Stock and RSUs, Forfeited		(1,430)
Restricted Stock and RSUs, end of period		903,525
Weighted-Average Grant Date Fair Value, beginning of period	$ 315.65	$ 315.65
Weighted-Average Grant Date Fair Value, Granted		375.27
Weighted-Average Grant Date Fair Value, Forfeited		296.12
Weighted-Average Grant Date Fair Value, end of period		$ 335.12
Market Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock and RSUs, beginning of period	803,474	803,474
Restricted Stock and RSUs, Converted		(517,138)
Restricted Stock and RSUs, end of period		286,336
Weighted-Average Grant Date Fair Value, beginning of period	$ 151.20	$ 151.20
Weighted-Average Grant Date Fair Value, Converted		126.76
Weighted-Average Grant Date Fair Value, end of period		$ 195.33

Stock-Based Compensation - Re69

Stock-Based Compensation - Restricted Stock and RSU Activity (Parenthetical) (Detail) shares in Millions	6 Months Ended
	Jun. 30, 2017Trancheshares	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards expected to vest	2.4
Awards vested, not converted	0.3
Market Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards expected to vest	0.2
Share price appreciation targets	15.00%	25.00%	35.00%
Restricted stock units vesting period, years	6 years	6 years	6 years
Number of tranches | Tranche	3

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock and RSUs, Granted			1,032,221
Fair value of RSUs/restricted stock granted to employees			$ 388
RSUs/Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock and RSUs, Granted	699,991
Restricted stock units vesting period, years	3 years
Awards to employees cliff vesting	277,313
RSUs to employees that cliff vest, percentage	100.00%
RSUs to employees that cliff vest, date	Jan. 31, 2020
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of outstanding RSUs			$ 1,100
Stock price			$ 422.41
Unrecognized stock-based compensation expense			$ 434
Remaining weighted-average period			1 year 4 months 24 days
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock and RSUs, Granted	293,385		294,584
Restricted stock units vesting period, years	3 years
Awards to employees cliff vesting	293,385
RSUs to employees that cliff vest, percentage	100.00%
RSUs to employees that cliff vest, date	Jan. 31, 2020
Intrinsic value of outstanding RSUs			$ 382
Stock price			$ 422.41
Unrecognized stock-based compensation expense			$ 157
Remaining weighted-average period			1 year 8 months 12 days
Fair value of RSUs/restricted stock granted to employees			$ 111
Market Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vesting period, years			6 years	6 years	6 years
Intrinsic value of outstanding RSUs			$ 121
Stock price			$ 422.41
Unrecognized stock-based compensation expense			$ 7
Market Performance-Based RSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period			1 year
Long-Term Incentive Plans Funded by PNC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares surrendered			3,800,000
Number of additional shares surrendered		517,138
Remaining shares committed by PNC for long-term incentive awards			200,000
Long-Term Incentive Plans Funded by PNC [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares committed to fund long-term incentive plans			4,000,000

Net Capital Requirements - Addi

Net Capital Requirements - Additional Information (Detail) $ in Billions	Jun. 30, 2017USD ($)
Regulatory Capital Requirements [Abstract]
Net capital requirement in certain regulated subsidiaries	$ 1.6

Accumulated Other Comprehensi72

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 29,150	$ 28,580
Other comprehensive income (loss)	$ 102	$ (86)	141	(112)
Balance	29,616	28,635	29,616	28,635
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(681)	(478)	(721)	(452)
Other comprehensive income (loss)	102	(87)	142	(113)
Balance	(579)	(565)	(579)	(565)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	4	4	5	4
Other comprehensive income (loss)		1	(1)	1
Balance	4	5	4	5
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(677)	(474)	(716)	(448)
Other comprehensive income (loss)	102	(86)	141	(112)
Balance	$ (575)	$ (560)	$ (575)	$ (560)

Accumulated Other Comprehensi73

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]
Gain (loss) from net investment hedging, net of tax	$ (31)	$ 12	$ (38)	$ (11)
Gain (loss) from net investment hedging, tax	$ (18)	$ 8	$ (22)	$ (6)

Capital Stock - Preferred Share

Capital Stock - Preferred Shares Authorized, Issued and Outstanding (Detail) - shares	Jun. 30, 2017	Dec. 31, 2016
Series A Nonvoting Participating Preferred Stock [Member]
Class of Stock [Line Items]
Shares authorized, $0.01 par value	20,000,000	20,000,000
Shares issued	0	0
Shares outstanding	0	0
Series B Nonvoting Participating Preferred Stock [Member]
Class of Stock [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]
Class of Stock [Line Items]
Shares authorized, $0.01 par value	6,000,000	6,000,000
Shares issued	246,522	763,660
Shares outstanding	246,522	763,660
Series D Nonvoting Participating Preferred Stock [Member]
Class of Stock [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 Sha75

Capital Stock - Preferred Shares Authorized, Issued and Outstanding (Parenthetical) (Detail) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Series A Nonvoting Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	$ 0.01	$ 0.01
Series B Nonvoting Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	0.01	0.01
Series C Non-voting Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	0.01	0.01
Series D Nonvoting Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	$ 0.01	$ 0.01

Capital Stock - Additional Info

Capital Stock - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Schedule of Capitalization, Equity [Line Items]
Common shares repurchased		1,400,000
Common shares repurchased, value		$ 550	$ 575
Shares authorized to be repurchased		7,600,000
Series C Non-voting Participating Preferred Stock [Member] | PNC [Member]
Schedule of Capitalization, Equity [Line Items]
Surrender of share of series non- voting preferred stock	517,138

Restructuring Charge - Addition

Restructuring Charge - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charge	$ 76	$ 76
After-tax restructuring charge	53
Restructuring liability			$ 2	$ 4
Employee Severance [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charge	44
Accelerated Amortization of Deferred Cash and Equity Compensation Awards [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charge	$ 32

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted EPS under Treasury Stock Method (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to BlackRock	$ 857	$ 789	$ 1,719	$ 1,446
Basic weighted-average shares outstanding	162,502,465	164,758,612	162,758,112	165,073,371
Dilutive effect of nonparticipating RSUs and stock options	1,647,396	1,880,678	1,786,648	1,950,188
Total diluted weighted-average shares outstanding	164,149,861	166,639,290	164,544,760	167,023,559
Basic earnings per share	$ 5.27	$ 4.79	$ 10.56	$ 8.76
Diluted earnings per share	$ 5.22	$ 4.73	$ 10.45	$ 8.66

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017Segment
Segment Reporting [Abstract]
Number of business segments	1

Segment Information - Schedule

Segment Information - Schedule of Investment Advisory, Administration Fees, Securities Lending Revenue and Performance Fees, Technology and Risk Management Revenue, Distribution Fees, and Advisory and Other Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total investment advisory, administration fees, securities lending revenue and performance fees	$ 2,723	$ 2,563	$ 5,323	$ 4,956
Technology and risk management revenue	164	146	322	287
Distribution fees	5	11	12	22
Advisory and other revenue	73	84	132	163
Total revenue	2,965	2,804	5,789	5,428
Equity [Member]
Segment Reporting Information [Line Items]
Total investment advisory, administration fees, securities lending revenue and performance fees	1,378	1,278	2,677	2,462
Fixed Income [Member]
Segment Reporting Information [Line Items]
Total investment advisory, administration fees, securities lending revenue and performance fees	713	657	1,404	1,280
Multi-asset [Member]
Segment Reporting Information [Line Items]
Total investment advisory, administration fees, securities lending revenue and performance fees	289	293	566	580
Alternatives [Member]
Segment Reporting Information [Line Items]
Total investment advisory, administration fees, securities lending revenue and performance fees	206	216	412	412
Cash Management [Member]
Segment Reporting Information [Line Items]
Total investment advisory, administration fees, securities lending revenue and performance fees	$ 137	$ 119	$ 264	$ 222

Segment Information - Total Rev

Segment Information - Total Revenue by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 2,965	$ 2,804	$ 5,789	$ 5,428
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	2,012	1,876	3,951	3,646
Europe [Member]
Segment Reporting Information [Line Items]
Revenue	803	792	1,550	1,514
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	$ 150	$ 136	$ 288	$ 268

Segment Information - Schedul82

Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Long-lived assets	$ 13,748	$ 13,677
Americas [Member]
Segment Reporting Information [Line Items]
Long-lived assets	13,498	13,424
Europe [Member]
Segment Reporting Information [Line Items]
Long-lived assets	163	163
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 87	$ 90