Cognizant Technology Solutions (CTSH) 10-Q 30 Oct 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 23, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	CTSH
Entity Registrant Name	COGNIZANT TECHNOLOGY SOLUTIONS CORP
Entity Central Index Key	1,058,290
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		579,028,009

Consolidated Statements Of Fina

Consolidated Statements Of Financial Position (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,339	$ 1,925
Short-term investments	3,424	3,131
Trade accounts receivable, net of allowances of $68 and $65, respectively	3,187	2,865
Unbilled accounts receivable	0	357
Other current assets	777	833
Total current assets	8,727	9,111
Property and equipment, net	1,362	1,324
Goodwill	3,037	2,704
Intangible assets, net	1,021	981
Deferred income tax assets, net	391	418
Long-term investments	93	235
Other noncurrent assets	643	448
Total assets	15,274	15,221
Current liabilities:
Accounts payable	223	210
Deferred revenue	244	383
Short-term debt	100	175
Accrued expenses and other current liabilities	2,126	2,071
Total current liabilities	2,693	2,839
Deferred revenue, noncurrent	72	104
Deferred income tax liabilities, net	157	146
Long-term debt	624	698
Long-term income taxes payable	490	584
Other noncurrent liabilities	260	181
Total liabilities	4,296	4,552
Commitments and contingencies (See Note 13)
Stockholders’ equity:
Preferred stock, $0.10 par value, 15.0 shares authorized, none issued	0	0
Class A common stock, $0.01 par value, 1,000 shares authorized, 580 and 588 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	6	6
Additional paid-in capital	119	49
Retained earnings	11,041	10,544
Accumulated other comprehensive income (loss)	(188)	70
Total stockholders’ equity	10,978	10,669
Total liabilities and stockholders’ equity	$ 15,274	$ 15,221

Consolidated Statements Of Fi_2

Consolidated Statements Of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances	$ 68	$ 65
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized	15,000,000	15,000,000
Preferred stock, issued	0	0
Class A common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Class A common stock, shares authorized	1,000,000,000	1,000,000,000
Class A common stock, shares issued	580,000,000	588,000,000
Class A common stock, shares outstanding	580,000,000	588,000,000

Consolidated Statements Of Oper

Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 4,078	$ 3,766	$ 11,996	$ 10,982
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	2,480	2,337	7,298	6,792
Selling, general and administrative expenses	734	674	2,250	2,069
Depreciation and amortization expense	119	107	340	297
Income from operations	745	648	2,108	1,824
Other income (expense), net:
Interest income	47	34	128	97
Interest expense	(6)	(6)	(19)	(18)
Foreign currency exchange gains (losses), net	(122)	(16)	(233)	41
Other, net	(2)	(2)	(2)	(2)
Total other income (expense), net	(83)	10	(126)	118
Income before provision for income taxes	662	658	1,982	1,942
Provision for income taxes	(185)	(164)	(530)	(421)
Income from equity method investments	0	1	1	1
Net income	$ 477	$ 495	$ 1,453	$ 1,522
Basic earnings per share (usd per share)	$ 0.82	$ 0.84	$ 2.49	$ 2.56
Diluted earnings per share (usd per share)	$ 0.82	$ 0.84	$ 2.48	$ 2.55
Weighted average number of common shares outstanding - Basic (shares)	579	590	584	594
Dilutive effect of shares issuable under stock-based compensation plans (shares)	1	2	1	2
Weighted average number of common shares outstanding - Diluted (shares)	580	592	585	596
Dividends declared per common share	$ 0.20	$ 0.15	$ 0.60	$ 0.30

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 477	$ 495	$ 1,453	$ 1,522
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(12)	33	(46)	100
Change in unrealized gains and losses on cash flow hedges	(82)	(22)	(205)	56
Change in unrealized gains and losses on available-for-sale securities	0	0	(6)	2
Other comprehensive income (loss)	(94)	11	(257)	158
Comprehensive income	$ 383	$ 506	$ 1,196	$ 1,680

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated other comprehensive income (loss):
AOCI, beginning balance at Dec. 31, 2016	$ 10,728	$ 6	$ 358	$ 10,478	$ (114)
Beginning balance, shares at Dec. 31, 2016		608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,522			1,522
Other comprehensive income (loss)	158				158
Common stock issued, stock-based compensation plans - value	146		146
Common stock issued, stock-based compensation plans - shares		6
Stock-based compensation expense	161		161
Repurchases of common stock, Value	(1,557)		(457)	(1,100)
Repurchases of common stock, Shares		(24)
Dividends	(179)			(179)
AOCI, ending balance at Sep. 30, 2017	10,979	$ 6	208	10,721	44
Ending balance, shares at Sep. 30, 2017		590
AOCI, beginning balance at Dec. 31, 2016	10,728	$ 6	358	10,478	(114)
Beginning balance, shares at Dec. 31, 2016		608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends	(268)
AOCI, ending balance at Dec. 31, 2017	$ 10,669	$ 6	49	10,544	70
Ending balance, shares at Dec. 31, 2017	588	588
AOCI, beginning balance at Jun. 30, 2017					33
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 495
Dividends	(90)
AOCI, ending balance at Sep. 30, 2017	10,979	$ 6	208	10,721	44
Ending balance, shares at Sep. 30, 2017		590
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends	(89)
AOCI, ending balance at Dec. 31, 2017	$ 10,669	$ 6	49	10,544	70
Ending balance, shares at Dec. 31, 2017	588	588
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,453
Other comprehensive income (loss)	(257)				(257)
Common stock issued, stock-based compensation plans - value	142		142
Common stock issued, stock-based compensation plans - shares		5
Stock-based compensation expense	199		199
Repurchases of common stock, Value	(994)		(271)	(723)
Repurchases of common stock, Shares		(13)
Dividends	(355)			(355)
AOCI, ending balance at Sep. 30, 2018	$ 10,978	$ 6	119	11,041	(188)
Ending balance, shares at Sep. 30, 2018	580	580
AOCI, beginning balance at Jun. 30, 2018					(94)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 477
Dividends	(117)
AOCI, ending balance at Sep. 30, 2018	$ 10,978	$ 6	$ 119	11,041	(188)
Ending balance, shares at Sep. 30, 2018	580	580
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of changes in accounting principle	$ 121			$ 122	$ (1)

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 1,453	$ 1,522
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	367	321
Provision for doubtful accounts	5	12
Deferred income taxes	46	(46)
Stock-based compensation expense	199	161
Other	196	(49)
Changes in assets and liabilities:
Trade accounts receivable	(313)	(284)
Other current assets	338	21
Other noncurrent assets	(194)	(65)
Accounts payable	(5)	(5)
Deferred revenues, current and noncurrent	(116)	(21)
Other current and noncurrent liabilities	(86)	4
Net cash provided by operating activities	1,890	1,571
Cash flows from investing activities:
Purchases of property and equipment	(281)	(204)
Purchases of available-for-sale investment securities	(1,356)	(2,163)
Proceeds from maturity or sale of available-for-sale investment securities	1,516	2,352
Purchases of held-to-maturity investment securities	(1,093)	(1,015)
Proceeds from maturity of held-to-maturity investment securities	750	208
Purchases of other investments	(479)	(363)
Proceeds from maturity or sale of other investments	345	835
Payments for business combinations, net of cash acquired	(479)	(72)
Net cash (used in) investing activities	(1,077)	(422)
Cash flows from financing activities:
Issuance of common stock under stock-based compensation plans	142	146
Repurchases of common stock	(994)	(1,557)
Repayment of term loan borrowings and capital lease obligations	(89)	(62)
Net change in notes outstanding under the revolving credit facility	(75)	0
Dividends paid	(352)	(179)
Net cash (used in) financing activities	(1,368)	(1,652)
Effect of exchange rate changes on cash and cash equivalents	(31)	46
(Decrease) in cash and cash equivalents	(586)	(457)
Cash and cash equivalents, beginning of year	1,925	2,034
Cash and cash equivalents, end of period	$ 1,339	$ 1,577

Interim Consolidated Financial

Interim Consolidated Financial Statements	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Consolidated Financial Statements	The terms “Cognizant,” “we,” “our,” “us” and “the Company” refer to Cognizant Technology Solutions Corporation and its subsidiaries unless the context indicates otherwise. We have prepared the accompanying unaudited consolidated financial statements included herein in accordance with generally accepted accounting principles in the United States of America, or U.S. GAAP, and Regulation S-X under the Securities Exchange Act of 1934, as amended, or the Exchange Act. The accompanying unaudited consolidated financial statements should be read in conjunction with our audited consolidated financial statements (and notes thereto) included in our Annual Report on Form 10-K for the year ended December 31, 2017 . In our opinion, all adjustments considered necessary for a fair statement of the accompanying unaudited consolidated financial statements have been included and all adjustments are of a normal and recurring nature. Operating results for the interim periods are not necessarily indicative of results that may be expected to occur for the entire year. Recently Adopted Accounting Pronouncements Date Issued and Topic Date Adopted and Method Description Impact May 2014 January 1, 2018 Modified Retrospective The new standard, as amended, sets forth a single comprehensive model for recognizing and reporting revenues. The standard also requires additional financial statement disclosures that enable users to understand the nature, amount, timing and uncertainty of revenues and cash flows relating to customer contracts. The standard allows for two methods of adoption: the full retrospective adoption, which requires the standard to be applied to each prior period presented, or the modified retrospective adoption, which requires the cumulative effect of adoption to be recognized as an adjustment to opening retained earnings in the period of adoption. See Note 3 for the impact of adoption of this standard. November 2016 Statement of Cash Flows January 1, 2018 Retrospective This update requires restricted cash to be included with cash and cash equivalents when reconciling the beginning and ending amounts on the statement of cash flows. It also requires a reconciliation of such totals to the amounts on the statement of financial position and disclosure as to the nature of the restrictions. There were no restricted cash balances as of September 30, 2018. The adoption of this update had no impact on our financial statements for the three and nine months ended September 30, 2018. February 2018 January 1, 2018 In the period of adoption This update provides an option for entities to reclassify stranded tax effects caused by the recently-enacted Tax Cuts and Jobs Act, or Tax Reform Act, from accumulated other comprehensive income to retained earnings. We have early adopted this update as of January 1, 2018. The adoption resulted in a decrease of $1 million in accumulated other comprehensive income and a corresponding increase of $1 million to opening retained earnings. New Accounting Pronouncements Date Issued and Topic Effective Date Description Impact February 2016 January 1, 2019 The new standard replaces the existing guidance on leases and requires the lessee to recognize a right-of-use asset and a lease liability for all leases with lease terms equal to or greater than twelve months. For finance leases, the lessee would recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee would recognize total lease expense on a straight-line basis. The standard offers several practical expedients for transition and certain expedients specific to lessees or lessors. The standard allows for two methods of adoption: retrospective to each prior reporting period presented with the cumulative effect of adoption recognized at the beginning of the earliest period presented or retrospective to the beginning of the period of adoption through a cumulative-effect adjustment. While we are continuing to evaluate the provisions of this standard, the primary effect will be to require recording of right-of-use assets and corresponding lease obligations for current operating leases. We expect the adoption of this standard to have a material impact on our consolidated statement of financial position, but not on the consolidated statements of operations or cash flows. As of December 31, 2017, our undiscounted operating lease commitments were $943 million. We are currently planning to elect the package of practical expedients which permits us to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs. We intend to adopt the standard retrospectively to the beginning of the period of adoption through a cumulative-effect adjustment. March 2017 January 1, 2019 This update shortens the amortization period for certain callable debt securities held at a premium to the earliest call date. The amendments do not require an accounting change for securities held at a discount. Upon adoption, entities will be required to use a modified retrospective transition with the cumulative effect adjustment recognized to retained earnings as of the beginning of the period of adoption. We do not expect the adoption of this update to have a material impact on our financial statements. August 2018 Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement (CCA) that is a Service Contract January 1, 2020 This update aligns the accounting for costs incurred to implement a CCA that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. The update clarifies that a customer should capitalize certain implementation costs and subsequently amortize such costs over the term of the hosting arrangement as operating expenses. We are currently evaluating the effect this update will have on our consolidated financial statements and related disclosures.

Internal Investigation and Rela

Internal Investigation and Related Matters	9 Months Ended
	Sep. 30, 2018
Internal Investigation and Related Matters [Abstract]
Internal Investigation and Related Matters	We have substantially completed our internal investigation focused on whether certain payments relating to Company-owned facilities in India were made improperly and in possible violation of the U.S. Foreign Corrupt Practices Act, or FCPA, and other applicable laws. The investigation, which began in 2016, has also examined various other payments made in small amounts in India that may not have complied with Company policy or applicable law. In September 2016, we voluntarily notified the U.S. Department of Justice, or DOJ, and Securities and Exchange Commission, or SEC, and are cooperating fully with both agencies. The investigation has been conducted under the oversight of the Audit Committee, with the assistance of outside counsel. In connection with the investigation, during the year ended December 31, 2016, we recorded out-of-period corrections related to $4 million of potentially improper payments between 2009 and 2016 that had been previously capitalized when they should have been expensed. These out-of-period corrections were not material to any previously issued financial statements. There were no adjustments recorded during 2018 and 2017 related to the amounts under investigation. The Company’s discussions with the DOJ and SEC have progressed to a point where the Company can now reasonably estimate a probable loss and has recorded an accrual of $28 million , or FCPA Accrual, in the caption “Accrued expenses and other current liabilities” in our consolidated statements of financial position. There can be no assurance as to the timing of a final resolution of these matters with the DOJ and SEC.

Revenues

Revenues	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Adoption of ASC Topic 606, “Revenue from Contracts with Customers” On January 1, 2018, we adopted ASC Topic 606, “Revenue from Contracts with Customers,” or the New Revenue Standard, using the modified retrospective method applied to contracts that were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under the New Revenue Standard, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting policies. For contracts that were modified before the effective date, the Company aggregated the effect of all contract modifications prior to identifying performance obligations and allocating transaction price in accordance with the practical expedient ASC 606-10-65-1-(f)-4. Upon adoption of the New Revenue Standard on January 1, 2018, we recorded a net increase to opening retained earnings of approximately $121 million , after a tax impact of $37 million . The impact of adoption primarily relates to (1) changes in the method used to measure progress on our fixed-price application maintenance, consulting and business process services contracts, (2) the longer period of amortization for costs to fulfill a contract, (3) the timing of revenue recognition and allocation of purchase price on our software license contracts, (4) the reclassification of balances representing receivables, as defined by the New Revenue Standard, from Unbilled accounts receivable to Trade accounts receivable, net, (5) the reclassification of balances representing contract assets, as defined by the New Revenue Standard, from Unbilled accounts receivable to Other current assets, as well as (6) the income tax impact of the above items, as applicable. The following tables compare the financial statement line items materially affected by the adoption of the New Revenue Standard as of and for the three and nine months ended September 30, 2018 to the pro-forma amounts had the previous guidance been in effect, or Pro-forma Amounts: September 30, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) Assets: Trade accounts receivable, net (1), (2) $ 3,187 $ 3,073 $ 114 Unbilled accounts receivable (1), (3) — 432 (432 ) Other current assets (2), (3) 777 457 320 Total current assets 2 Other noncurrent assets (4) 643 589 54 Total assets $ 56 Liabilities: Deferred revenue (2) $ 244 $ 417 $ (173 ) Total current liabilities (173 ) Deferred revenue, noncurrent (2) 72 106 (34 ) Deferred income tax liabilities, net (5) 157 100 57 Total liabilities (150 ) Stockholders’ equity: Retained earnings 11,041 10,835 206 Total stockholders’ equity 206 Total liabilities and stockholders’ equity $ 56 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) (in millions) Revenues (2) $ 4,078 $ 4,045 $ 33 $ 11,996 $ 11,911 $ 85 Cost of revenues (4) 2,480 2,484 (4 ) 7,298 7,317 (19 ) Selling, general and administrative expenses 734 734 — 2,250 2,250 — Depreciation and amortization expense 119 119 — 340 340 — Income from operations 745 708 37 2,108 2,004 104 Other income (expense), net (83 ) (84 ) 1 (126 ) (127 ) 1 Income before provision for income taxes (5) 662 624 38 1,982 1,877 105 Provision for income taxes (185 ) (178 ) (7 ) (530 ) (510 ) (20 ) Income (loss) from equity method investment — — — 1 1 — Net income $ 477 $ 446 $ 31 $ 1,453 $ 1,368 $ 85 Basic earnings per share $ 0.82 $ 0.77 $ 0.05 $ 2.49 $ 2.34 $ 0.15 Diluted earnings per share $ 0.82 $ 0.77 $ 0.05 $ 2.48 $ 2.34 $ 0.14 (1) Reflects the reclassification of balances representing receivables, as defined by the New Revenue Standard, from Unbilled accounts receivable to Trade accounts receivable, net. (2) Reflects the impact of changes in the method used to measure progress on our fixed-price application maintenance, consulting and business process services contracts and the timing of revenue recognition and allocation of purchase price on our software license contracts. (3) Reflects the reclassification of balances representing contract assets, as defined by the New Revenue Standard, from Unbilled accounts receivable to Other current assets. (4) Reflects the impact of a longer period of amortization for costs to fulfill a contract. (5) Reflects the income tax impact of the above items. Revenue Recognition We recognize revenues as we transfer control of deliverables (products, solutions and services) to our customers in an amount reflecting the consideration to which we expect to be entitled. To recognize revenues, we apply the following five step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenues when a performance obligation is satisfied. We account for a contract when it has approval and commitment from all parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company applies judgment in determining the customer’s ability and intention to pay, which is based on a variety of factors including the customer’s historical payment experience. We may enter into arrangements that consist of multiple performance obligations. Such arrangements may include any combination of our deliverables. To the extent a contract includes multiple promised deliverables, we apply judgment to determine whether promised deliverables are capable of being distinct and are distinct in the context of the contract. If these criteria are not met, the promised deliverables are accounted for as a combined performance obligation. For arrangements with multiple distinct performance obligations, we allocate consideration among the performance obligations based on their relative standalone selling price. Standalone selling price is the price at which we would sell a promised good or service separately to the customer. When not directly observable, we typically estimate standalone selling price by using the expected cost plus a margin approach. We typically establish a standalone selling price range for our deliverables, which is reassessed on a periodic basis or when facts and circumstances change. For performance obligations where control is transferred over time, revenues are recognized based on the extent of progress towards completion of the performance obligation. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the deliverables to be provided. Revenues related to fixed-price contracts for application development and systems integration services, consulting or other technology services are recognized as the service is performed using the cost to cost method, under which the total value of revenues is recognized on the basis of the percentage that each contract’s total labor cost to date bears to the total expected labor costs. Revenues related to fixed-price application maintenance, testing and business process services are recognized based on our right to invoice for services performed for contracts in which the invoicing is representative of the value being delivered, in accordance with the practical expedient in ASC 606-10-55-18. If our invoicing is not consistent with value delivered, revenues are recognized as the service is performed based on the cost to cost method described above. The cost to cost method requires estimation of future costs, which is updated as the project progresses to reflect the latest available information; such estimates and changes in estimates involve the use of judgment. The cumulative impact of any revision in estimates is reflected in the financial reporting period in which the change in estimate becomes known and any anticipated losses on contracts are recognized immediately. Revenues related to fixed-price hosting and infrastructure services are recognized based on our right to invoice for services performed for contracts in which the invoicing is representative of the value being delivered, in accordance with the practical expedient in ASC 606-10-55-18. If our invoicing is not consistent with value delivered, revenues are recognized on a straight-line basis unless revenues are earned and obligations are fulfilled in a different pattern. The revenue recognition method applied to the types of contracts described above provides the most faithful depiction of performance towards satisfaction of our performance obligations; for example, the cost to cost method is used when the value of services provided to the customer is best represented by the costs expended to deliver those services. Revenues related to our non-hosted software license arrangements that do not require significant modification or customization of the underlying software are recognized when the software is delivered as control is transferred at a point in time. For software license arrangements that require significant functionality enhancements or modification of the software, revenues for the software license and related services are recognized as the services are performed in accordance with the methods described above. In software hosting arrangements, the rights provided to the customer, such as ownership of a license, contract termination provisions and the feasibility of the client to operate the software, are considered in determining whether the arrangement includes a license or a service. Sales and usage-based fees promised in exchange for licenses of intellectual property are not recognized as revenue until the uncertainty related to the variable amounts is resolved. Revenues related to software maintenance and support are generally recognized on a straight-line basis over the contract period. Revenues related to our time-and-materials, transaction-based or volume-based contracts are recognized over the period the services are provided in a manner that corresponds with the value transferred to the customer to-date relative to the remaining services to be provided. Revenues also include the reimbursement of out-of-pocket expenses. Our warranties generally provide a customer with assurance that the related deliverable will function as the parties intended because it complies with agreed-upon specifications and is therefore not considered an additional performance obligation in the contract. From time to time, we may enter into arrangements with third party suppliers to resell products or services. In such cases, we evaluate whether we are the principal (i.e. report revenues on a gross basis) or agent (i.e. report revenues on a net basis). In doing so, we first evaluate whether we control the good or service before it is transferred to the customer. If we control the good or service before it is transferred to the customer, we are the principal; if not, we are the agent. Determining whether we control the good or service before it is transferred to the customer may require judgment. Our contracts may be modified to add, remove or change existing performance obligations. The accounting for modifications to our contracts involves assessing whether the services added to an existing contract are distinct and whether the pricing is at the standalone selling price. Services added that are not distinct are accounted for on a cumulative catch up basis, while those that are distinct are accounted for prospectively, either as a separate contract if the additional services are priced at the standalone selling price, or as a termination of the existing contract and creation of a new contract if not priced at the standalone selling price. Services added to our application development and systems integration service contracts are typically not distinct, while services added to our other contracts, including application maintenance, testing and business process services contracts, are typically distinct. Incentive revenues, volume discounts, or any other form of variable consideration is estimated using either the sum of probability weighted amounts in a range of possible consideration amounts (expected value), or the single most likely amount in a range of possible consideration amounts (most likely amount), depending on which method better predicts the amount of consideration to which we may be entitled. We include in the transaction price variable consideration only to the extent it is probable that a significant reversal of revenues recognized will not occur when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in the transaction price may involve judgment and are based largely on an assessment of our anticipated performance and all information that is reasonably available to us. We assess the timing of the transfer of goods or services to the customer as compared to the timing of payments to determine whether a significant financing component exists. As a practical expedient, we do not assess the existence of a significant financing component when the difference between payment and transfer of deliverables is a year or less. If the difference in timing arises for reasons other than the provision of finance to either the customer or us, no financing component is deemed to exist. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our services, not to receive or provide financing from or to customers. We do not consider set up or transition fees paid upfront by our customers to represent a financing component, as such fees are required to encourage customer commitment to the project and protect us from early termination of the contract. Costs to Fulfill Recurring operating costs for contracts with customers are recognized as incurred. Certain eligible, nonrecurring costs incurred in the initial phases of our application maintenance, business process outsourcing and infrastructure services contracts (i.e. set-up or transition costs) are capitalized when such costs (1) relate directly to the contract, (2) generate or enhance resources of the Company that will be used in satisfying the performance obligation in the future, and (3) are expected to be recovered. These costs are expensed ratably over the estimated life of the customer relationship, including expected renewals. In determining the estimated life of the customer relationship, we evaluate the average contract term, on a portfolio basis by nature of the services to be provided, and apply judgment to evaluate the rate of technological and industry change. Capitalized amounts are monitored regularly for impairment. Impairment losses are recorded when projected remaining undiscounted operating cash flows are not sufficient to recover the carrying amount of the capitalized costs to fulfill. The following table presents information related to the capitalized costs to fulfill, such as set-up or transition activities, for the nine months ended September 30, 2018 . Costs to fulfill are recorded in "Other noncurrent assets" in our consolidated statements of financial position. Costs to obtain contracts were immaterial for the periods disclosed. Costs to Fulfill (in millions) Balance - January 1, 2018 $ 303 Amortization expense (50 ) Costs capitalized 132 Other (2 ) Balance - September 30, 2018 $ 383 Trade Accounts Receivable and Contract Balances We classify our right to consideration in exchange for deliverables as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional (i.e. only the passage of time is required before payment is due). For example, we recognize a receivable for revenues related to our time and materials and transaction or volume-based contracts when earned regardless of whether amounts have been billed. We present such receivables in Trade accounts receivable, net in our consolidated statements of financial position at their net estimated realizable value. We maintain an allowance for doubtful accounts to provide for the estimated amount of receivables that may not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables and other applicable factors. A contract asset is a right to consideration that is conditional upon factors other than the passage of time. Contract assets are presented in Other current assets in our consolidated statements of financial position and primarily relate to unbilled amounts on fixed-price contracts utilizing the cost to cost method of revenue recognition. The table below shows significant movements in contract assets: Contract Assets (in millions) Balance - January 1, 2018 $ 306 Revenues recognized during the period but not billed 290 Amounts reclassified to accounts receivable (273 ) Other (3 ) Balance - September 30, 2018 $ 320 Our contract liabilities, or deferred revenue, consist of advance payments and billings in excess of revenues recognized. We classify deferred revenue as current or noncurrent based on the timing of when we expect to recognize the revenues. The noncurrent portion of deferred revenue is included in other noncurrent liabilities in our consolidated statements of financial position. The table below shows significant movements in the deferred revenue balances (current and noncurrent) for the period disclosed: Deferred Revenue (in millions) Balance - January 1, 2018 $ 431 Amounts billed but not recognized as revenues 116 Revenues recognized related to the opening balance of deferred revenue (230 ) Other (1 ) Balance - September 30, 2018 $ 316 Our contract assets and liabilities are reported in a net position on a contract by contract basis at the end of each reporting period. The difference between the opening and closing balances of our contract assets and deferred revenues primarily results from the timing difference between our performance obligations and the customer’s payment. We receive payments from customers based on the terms established in our contracts, which vary by contract type. Revenues recognized during the nine months ended September 30, 2018 for performance obligations satisfied or partially satisfied in previous periods were immaterial. Remaining Performance Obligations ASC 606 requires that we disclose the aggregate amount of transaction price that is allocated to performance obligations that have not yet been satisfied as of September 30, 2018. This disclosure is not required for: (1) contracts with a duration of one year or less as determined under ASC 606, (2) contracts for which we recognize revenues based on the right to invoice for services performed, (3) variable consideration allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied promise to transfer a distinct good or service that forms part of a single performance obligation in accordance with ASC 606-10-25-14(b), for which the criteria in ASC 606-10-32-40 have been met, or (4) variable consideration in the form of a sales-based or usage based royalty promised in exchange for a license of intellectual property. Many of our performance obligations meet one or more of these exemptions. As of September 30, 2018, the aggregate amount of transaction price allocated to remaining performance obligations, other than those meeting the exclusion criteria above, was $2,014 million , of which approximately 70% is expected to be recognized as revenues within 2 years. Disaggregation of Revenues The table below presents disaggregated revenues from contracts with customers by customer location, service line and contract-type for each of our business segments. We believe this disaggregation best depicts how the nature, amount, timing and uncertainty of our revenues and cash flows are affected by industry, market and other economic factors. Three Months Ended September 30, 2018 Financial Services Healthcare Products and Resources Communications, Media and Technology Total (in millions) Revenues Geography: North America $ 1,033 $ 1,084 $ 609 $ 381 $ 3,107 United Kingdom 127 23 90 85 325 Rest of Europe 170 69 109 50 398 Europe - Total 297 92 199 135 723 Rest of World 134 13 55 46 248 Total $ 1,464 $ 1,189 $ 863 $ 562 $ 4,078 Service line: Consulting and technology services $ 902 $ 645 $ 512 $ 292 $ 2,351 Outsourcing services 562 544 351 270 1,727 Total $ 1,464 $ 1,189 $ 863 $ 562 $ 4,078 Type of contract: Time and materials $ 954 $ 464 $ 374 $ 354 $ 2,146 Fixed-price 453 452 392 187 1,484 Transaction or volume-based 57 273 97 21 448 Total $ 1,464 $ 1,189 $ 863 $ 562 $ 4,078 Nine Months Ended September 30, 2018 Financial Services Healthcare Products and Resources Communications, Media and Technology Total (in millions) Revenues Geography: North America $ 3,133 $ 3,167 $ 1,766 $ 1,083 $ 9,149 United Kingdom 357 68 266 253 944 Rest of Europe 497 191 327 138 1,153 Europe - Total 854 259 593 391 2,097 Rest of World 407 40 165 138 750 Total $ 4,394 $ 3,466 $ 2,524 $ 1,612 $ 11,996 Service line: Consulting and technology services $ 2,658 $ 1,896 $ 1,492 $ 859 $ 6,905 Outsourcing services 1,736 1,570 1,032 753 5,091 Total $ 4,394 $ 3,466 $ 2,524 $ 1,612 $ 11,996 Type of contract: Time and materials $ 2,842 $ 1,364 $ 1,122 $ 995 $ 6,323 Fixed-price 1,384 1,406 1,120 545 4,455 Transaction or volume-based 168 696 282 72 1,218 Total $ 4,394 $ 3,466 $ 2,524 $ 1,612 $ 11,996

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Business Combinations	During the nine months ended September 30, 2018, we completed two business combinations for total consideration of approximately $492 million , inclusive of contingent consideration. The acquisition of Bolder Healthcare Solutions, a privately-held U.S. provider of revenue cycle management solutions to the healthcare industry expands our healthcare consulting, technology and business process services portfolio and strengthens our position in digital healthcare technology and operations. The acquisition of Hedera Consulting, a privately-held company specializing in business advisory and data analytics services across a number of industries expands our consulting, business insight and digital transformation capabilities in Belgium and the Netherlands. These acquisitions were not material, either individually or in the aggregate, to our operations, financial position or operating cash flow. Accordingly, pro forma results have not been presented. These acquisitions were included in our unaudited consolidated financial statements as of the date on which the businesses were acquired. We have allocated the purchase price related to these transactions to tangible and intangible assets and liabilities, including non-deductible goodwill, based on their estimated fair values. We will finalize the purchase price allocation as soon as practicable within the measurement period, but in no event later than one year following the date of acquisition. The allocations of preliminary purchase price to the fair value of the aggregate assets acquired and liabilities assumed were as follows: Fair Value Weighted Average Useful Life (in millions) Cash $ 9 Current assets 37 Property, plant and equipment and other noncurrent assets 7 Non-deductible goodwill (1) 344 Customer relationship intangible assets 122 9.7 years Other intangible assets 26 2.4 years Current liabilities (14 ) Noncurrent liabilities (39 ) Purchase price $ 492 (1) The primary items that generated goodwill are the value of the acquired assembled workforces and synergies between the acquired companies and us, neither of which qualify as an amortizable intangible asset.

Realignment Charges

Realignment Charges	9 Months Ended
	Sep. 30, 2018
Realignment Charges [Abstract]
Realignment Charges	In 2017, we began a realignment of our business to accelerate the shift to digital services and solutions while improving the overall efficiency of our operations. As part of this realignment, for the three and nine months ended September 30, 2017, we incurred $19 million and $69 million , respectively, in pre-tax charges. These charges included severance costs primarily related to our voluntary separation program announced in May 2017, lease termination costs and advisory fees related to non-routine shareholder matters and charges related to the development of our realignment and return of capital programs. Further, during the three months ended September 30, 2018, we incurred $11 million in pre-tax severance costs as part of an involuntary separation program. Our realignment initiatives are intended to further improve our cost structure primarily by optimizing our resource pyramid. The total costs related to the realignment are reported in "Selling, general and administrative expenses" in our consolidated statements of operations. Realignment charges were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Employee separations $ 11 $ 14 $ 11 $ 53 Advisory fees — 5 — 15 Lease termination costs — — 1 1 Total realignment costs $ 11 $ 19 $ 12 $ 69

Investments

Investments	9 Months Ended
	Sep. 30, 2018
Investments [Abstract]
Investments	Our investments were as follows: September 30, 2018 December 31, 2017 (in millions) Short-term investments: Equity investment securities $ 25 $ 25 Available-for-sale investment securities 1,801 1,972 Held-to-maturity investment securities 1,133 745 Time deposits 465 (1) 389 Total short-term investments $ 3,424 $ 3,131 Long-term investments: Equity and cost method investments $ 75 $ 74 Held-to-maturity investment securities 18 161 Total long-term investments $ 93 $ 235 (1) Includes $405 million in restricted time deposits as of September 30, 2018. See Note 9 . Equity Investment Securities Our equity investment securities consist of a U.S. dollar denominated investment in a fixed income mutual fund. Unrealized losses for the three and nine months ended September 30, 2018 and 2017 were immaterial. The value of the fixed income mutual fund is based on the net asset value, or NAV, of the fund, with appropriate consideration of the liquidity and any restrictions on disposition of our investment in the fund. There were no realized gains or losses on equity securities during the three and nine months ended September 30, 2018 and 2017. Available-for-Sale Investment Securities Our available-for-sale investment securities consist of U.S. dollar denominated investments primarily in U.S. Treasury notes, U.S. government agency debt securities, municipal debt securities, non-U.S. government debt securities, U.S. and international corporate bonds, certificates of deposit, commercial paper, debt securities issued by supranational institutions, and asset-backed securities, including securities backed by auto loans, credit card receivables, and other receivables. Our investment guidelines are to purchase securities which are investment grade at the time of acquisition. We monitor the credit ratings of the securities in our portfolio on an ongoing basis. The amortized cost, gross unrealized gains and losses and fair value of available-for-sale investment securities at September 30, 2018 were as follows: Amortized Cost Unrealized Gains Unrealized Losses Fair (in millions) U.S. Treasury and agency debt securities $ 647 $ — $ (10 ) $ 637 Corporate and other debt securities 431 — (5 ) 426 Certificates of deposit and commercial paper 317 — — 317 Asset-backed securities 321 — (3 ) 318 Municipal debt securities 104 — (1 ) 103 Total available-for-sale investment securities $ 1,820 $ — $ (19 ) $ 1,801 The amortized cost, gross unrealized gains and losses and fair value of available-for-sale investment securities at December 31, 2017 were as follows: Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in millions) U.S. Treasury and agency debt securities $ 667 $ — $ (6 ) $ 661 Corporate and other debt securities 439 — (2 ) 437 Certificates of deposit and commercial paper 450 — — 450 Asset-backed securities 297 — (2 ) 295 Municipal debt securities 130 — (1 ) 129 Total available-for-sale investment securities $ 1,983 $ — $ (11 ) $ 1,972 The fair value and related unrealized losses of available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of September 30, 2018 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) U.S. Treasury and agency debt securities $ 296 $ (4 ) $ 336 $ (6 ) $ 632 $ (10 ) Corporate and other debt securities 258 (3 ) 134 (2 ) 392 (5 ) Certificates of deposit and commercial paper 198 — — — 198 — Asset-backed securities 168 (1 ) 137 (2 ) 305 (3 ) Municipal debt securities 62 (1 ) 40 — 102 (1 ) Total $ 982 $ (9 ) $ 647 $ (10 ) $ 1,629 $ (19 ) The fair value and related unrealized losses of available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31, 2017 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) U.S. Treasury and agency debt securities $ 519 $ (4 ) $ 124 $ (2 ) $ 643 $ (6 ) Corporate and other debt securities 297 (1 ) 126 (1 ) 423 (2 ) Certificates of deposit and commercial paper 49 — — — 49 — Asset-backed securities 193 (1 ) 94 (1 ) 287 (2 ) Municipal debt securities 107 (1 ) 18 — 125 (1 ) Total $ 1,165 $ (7 ) $ 362 $ (4 ) $ 1,527 $ (11 ) The unrealized losses for the above securities as of September 30, 2018 and December 31, 2017 were primarily attributable to changes in interest rates. At each reporting date, we perform an evaluation of impaired available-for-sale securities to determine if the unrealized losses are other-than-temporary. We do not consider any of the investments to be other-than-temporarily impaired as of September 30, 2018 . The gross unrealized gains and losses in the above tables were recorded, net of tax, in "Accumulated other comprehensive income (loss)" in our consolidated statements of financial position. The contractual maturities of our fixed income available-for-sale investment securities as of September 30, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 579 $ 578 Due after one year up to two years 474 466 Due after two years up to three years 407 400 Due after three years 39 39 Asset-backed securities 321 318 Total available-for-sale investment securities $ 1,820 $ 1,801 Asset-backed securities were excluded from the maturity categories because the actual maturities may differ from the contractual maturities since the underlying receivables may be prepaid without penalties. Further, actual maturities of debt securities may differ from those presented above since certain obligations provide the issuer the right to call or prepay the obligation prior to scheduled maturity without penalty. Proceeds from sales of available-for-sale investment securities and the gross gains and losses that have been included in earnings as a result of those sales were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Proceeds from sales of available-for-sale investment securities $ 490 $ 375 $ 1,049 $ 2,020 Gross gains $ — $ — $ — $ 1 Gross losses (1 ) (1 ) (3 ) (2 ) Net realized (losses) on sales of available-for-sale investment securities $ (1 ) $ (1 ) $ (3 ) $ (1 ) Held-to-Maturity Investment Securities Our held-to-maturity investment securities consist of Indian rupee denominated investments primarily in commercial paper, corporate bonds and government debt securities. Our investment guidelines are to purchase securities that are investment grade at the time of acquisition. We monitor the credit ratings of the securities in our portfolio on an ongoing basis. The amortized cost, gross unrealized gains and losses and fair value of held-to-maturity investment securities at September 30, 2018 were as follows: Amortized Unrealized Unrealized Fair (in millions) Short-term investments: Corporate and other debt securities $ 677 $ — $ (3 ) $ 674 Commercial paper 456 — (2 ) 454 Total short-term held-to-maturity investments 1,133 — (5 ) 1,128 Long-term investments: Corporate and other debt securities 6 — — 6 Commercial paper 12 — — 12 Total held-to-maturity investment securities $ 1,151 $ — $ (5 ) $ 1,146 The amortized cost, gross unrealized gains and losses and fair value of held-to-maturity investment securities at December 31, 2017 were as follows: Amortized Unrealized Unrealized Fair (in millions) Short-term investments: Corporate and other debt securities $ 346 $ — $ (1 ) $ 345 Commercial paper 399 — (2 ) 397 Total short-term held-to-maturity investments 745 — (3 ) 742 Long-term investments: Corporate and other debt securities 161 — (1 ) 160 Total held-to-maturity investment securities $ 906 $ — $ (4 ) $ 902 The fair value and related unrealized losses of held-to-maturity investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of September 30, 2018 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) Corporate and other debt securities $ 469 $ (2 ) $ 168 $ (1 ) $ 637 $ (3 ) Commercial paper 454 (2 ) — — 454 (2 ) Total $ 923 $ (4 ) $ 168 $ (1 ) $ 1,091 $ (5 ) The fair value and related unrealized losses of held-to-maturity investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31, 2017 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) Corporate and other debt securities $ 473 $ (2 ) $ — $ — $ 473 $ (2 ) Commercial paper 394 (2 ) — — 394 (2 ) Total $ 867 $ (4 ) $ — $ — $ 867 $ (4 ) At each reporting date, the Company performs an evaluation of held-to-maturity securities to determine if the unrealized losses are other-than-temporary. We do not consider any of the investments to be other-than-temporarily impaired as of September 30, 2018 . The contractual maturities of our fixed income held-to-maturity investment securities as of September 30, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 1,133 $ 1,128 Due after one year up to two years 12 12 Due after two years 6 6 Total held-to-maturity investment securities $ 1,151 $ 1,146 During the nine months ended September 30, 2018 and the year ended December 31, 2017, there were no transfers of investments between our available-for-sale and held-to-maturity investment portfolios.

Accrued Expenses And Other Curr

Accrued Expenses And Other Current Liabilities	9 Months Ended
	Sep. 30, 2018
Payables and Accruals [Abstract]
Accrued Expenses And Other Current Liabilities	Accrued expenses and other current liabilities were as follows: September 30, 2018 December 31, 2017 (in millions) Compensation and benefits $ 1,053 $ 1,272 Customer volume and other incentives 320 289 Derivative financial instruments 67 5 FCPA Accrual 28 — Income taxes 158 48 Professional fees 114 100 Travel and entertainment 57 32 Other 329 325 Total accrued expenses and other current liabilities $ 2,126 $ 2,071

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	In 2014, we entered into a credit agreement with a commercial bank syndicate, or, as amended, the Credit Agreement, providing for a $1,000 million unsecured term loan and a $750 million unsecured revolving credit facility. All notes drawn to date under the revolving credit facility have been less than 90 days in duration. The term loan and the revolving credit facility both mature in November 2019. We are required under the Credit Agreement to make scheduled quarterly principal payments on the term loan, with a final payment of $625 million due on the term loan due in November 2019. We are currently evaluating alternative financing arrangements. We were in compliance with all debt covenants and representations as of September 30, 2018 . Short-term Debt The following summarizes our short-term debt balances as of: September 30, 2018 December 31, 2017 (in millions) Notes outstanding under revolving credit facility $ — $ 75 Term loan - current maturities 100 100 Total short-term debt $ 100 $ 175 Long-term Debt The following summarizes our long-term debt balances as of: September 30, 2018 December 31, 2017 (in millions) Term loan, due November 2019 $ 725 $ 800 Less: Current maturities (100 ) (100 ) Deferred financing costs (1 ) (2 ) Long-term debt, net of current maturities $ 624 $ 698

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	On December 22, 2017, the United States enacted the Tax Reform Act, which significantly revised the U.S. corporate income tax law for tax years beginning after December 31, 2017 by (among other provisions): • reducing the U.S. federal statutory corporate income tax rate from 35% to 21% for tax years beginning after December 31, 2017; • implementing a modified territorial tax system that includes a one-time transition tax on all accumulated undistributed earnings of foreign subsidiaries; • providing for a full deduction on future dividends received from foreign affiliates; and • imposing a U.S. income tax on global intangible low-taxed income, or GILTI. During the fourth quarter of 2017, in accordance with the SEC Staff Accounting Bulletin ("SAB") No. 118 - Income Tax Accounting Implications of the Tax Cuts and Jobs Act, we recorded a one-time provisional net income tax expense of $617 million , which was comprised of: (i) the one-time transition tax expense on accumulated undistributed earnings of foreign subsidiaries of $635 million , (ii) foreign and U.S. state income tax expense that will be applicable upon repatriation of the accumulated undistributed earnings of our foreign subsidiaries, other than our Indian subsidiaries, of $53 million , partially offset by (iii) an income tax benefit of $71 million resulting from the revaluation of U.S. net deferred income tax liabilities to the new lower U.S. income tax rate. During the three months ended September 30, 2018 , we recognized a $5 million reduction to the provision for income taxes as we finalized our calculation of the one-time net income tax expense related to the enactment of the Tax Reform Act, bringing the final one-time cost to $612 million . The Company has elected to pay the transition tax on undistributed earnings in installments through the year 2024. Our effective income tax rates were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Effective income tax rate 27.9 % 24.9 % 26.7 % 21.7 % The effective tax rate for the nine months ended September 30, 2017 was impacted by the recognition of income tax benefits previously unrecognized in our consolidated financial statements related to several uncertain tax positions totaling $72 million . The recognition of these benefits in the first quarter of 2017 was based on management’s reassessment regarding whether certain unrecognized tax benefits met the more-likely-than-not threshold in light of the lapse in the statute of limitations as to a portion of such benefits. The estimate of our 2018 annual effective income tax rate reflects the current interpretation of the Tax Reform Act, including the GILTI provision and may change as we receive additional clarification and guidance and as the interpretation of the Tax Reform Act evolves over time. We are involved in an ongoing dispute with the Indian Income Tax Department, or ITD, in connection with which we received a notice in March 2018 asserting that the ITD is owed additional taxes on our previously disclosed 2016 India Cash Remittance, the transaction undertaken by our principal operating subsidiary in India, or CTS India, to repurchase shares from its shareholders, which are non-Indian Cognizant entities, valued at $2.8 billion . As a result of that transaction, undertaken pursuant to a plan approved by the Madras High Court in Chennai, India, we previously paid $135 million in Indian income taxes, which we believe are all the applicable taxes owed for this transaction under Indian law. The ITD is asserting that we owe an additional 33 billion Indian rupees ( $455 million at the September 30, 2018 exchange rate) related to the 2016 India Cash Remittance. In addition to the dispute on the 2016 India Cash Remittance, we are involved in another ongoing dispute with the ITD relating to a 2013 transaction undertaken by CTS India to repurchase shares from its shareholders valued at $523 million (the two disputes collectively referred to as the ITD Dispute), for which we also believe we have paid all the applicable taxes owed. Accordingly, we have not recorded any reserves for these matters as of September 30, 2018 . The ITD Dispute is ongoing, and no final decision has been reached. In March 2018, the ITD placed an attachment on certain of our India bank accounts, relating to the 2016 India Cash Remittance. In April 2018, the Madras High Court granted our application for a stay of the actions of the ITD and lifted the ITD’s attachment of our bank accounts. As part of the interim stay order, we have deposited 5 billion Indian rupees ( $68 million at the September 30, 2018 exchange rate) representing 15% of the disputed tax amount related to the 2016 India Cash Remittance, to be kept in a segregated account by the ITD. This amount is presented in "Other current assets" on our consolidated statement of financial position. In addition, in April 2018 the court placed a lien on certain time deposits of CTS India in the amount of 28 billion Indian rupees ( $387 million at the September 30, 2018 exchange rate), which is the remainder of the disputed tax amount related to the 2016 India Cash Remittance. The affected time deposits are considered restricted assets and we have reported them in “Short-term investments” on our consolidated statement of financial position. As of September 30, 2018 , the restricted time deposits balance was $405 million , including accumulated interest. There were no restricted time deposits as of December 31, 2017.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	In the normal course of business, we use foreign exchange forward contracts to manage foreign currency exchange rate risk. The estimated fair value of the foreign exchange forward contracts considers the following items: discount rate, timing and amount of cash flow and counterparty credit risk. Derivatives may give rise to credit risks from the possible non-performance by counterparties. Credit risk is generally limited to the fair value of those contracts that are favorable to us. We have limited our credit risk by entering into derivative transactions only with highly-rated financial institutions, limiting the amount of credit exposure with any one financial institution and conducting an ongoing evaluation of the creditworthiness of the financial institutions with which we do business. In addition, all the assets and liabilities related to our foreign exchange forward contracts set forth in the below table are subject to International Swaps and Derivatives Association, or ISDA, master netting arrangements or other similar agreements with each individual counterparty. These master netting arrangements generally provide for net settlement of all outstanding contracts with the counterparty in the case of an event of default or a termination event. We have presented all the assets and liabilities related to our foreign exchange forward contracts on a gross basis, with no offsets, in our accompanying unaudited consolidated statements of financial position. There is no financial collateral (including cash collateral) posted or received by us related to our foreign exchange forward contracts. The following table provides information on the location and fair values of derivative financial instruments included in our unaudited consolidated statements of financial position as of: September 30, 2018 December 31, 2017 Designation of Derivatives Location on Statements of Financial Position Assets Liabilities Assets Liabilities (in millions) Foreign exchange forward contracts – Designated as cash flow hedging instruments Other current assets $ 4 $ — $ 134 $ — Other noncurrent assets — — 20 — Accrued expenses and other current liabilities — 66 — — Other noncurrent liabilities — 48 — — Total 4 114 154 — Foreign exchange forward contracts – Not designated as hedging instruments Other current assets 3 — — — Accrued expenses and other current liabilities — 1 — 5 Total 3 1 — 5 Total $ 7 $ 115 $ 154 $ 5 Cash Flow Hedges We have entered into a series of foreign exchange forward contracts that are designated as cash flow hedges of Indian rupee denominated payments in India. These contracts are intended to partially offset the impact of movement of exchange rates on future operating costs and are scheduled to mature each month during 2018 , 2019 and the first nine months of 2020. Under these contracts, we purchase Indian rupees and sell U.S. dollars. The changes in fair value of these contracts are initially reported in the caption “Accumulated other comprehensive income (loss)” in our consolidated statements of financial position and are subsequently reclassified to earnings in the same period the forecasted Indian rupee denominated payments are recorded in earnings. As of September 30, 2018 , we estimate that $50 million , net of tax, of net losses related to derivatives designated as cash flow hedges recorded in accumulated other comprehensive income (loss) is expected to be reclassified into earnings within the next 12 months. The notional value of our outstanding contracts by year of maturity and the net unrealized gains included in accumulated other comprehensive income (loss) for such contracts were as follows as of: September 30, 2018 December 31, 2017 (in millions) 2018 $ 360 $ 1,185 2019 1,215 720 2020 555 — Total notional value of contracts outstanding $ 2,130 $ 1,905 Net unrealized (losses) gains included in accumulated other comprehensive income (loss), net of taxes $ (90 ) $ 115 Upon settlement or maturity of the cash flow hedge contracts, we record the gains or losses, based on our designation at the commencement of the contract, with the related hedged Indian rupee denominated expense reported within cost of revenues and selling, general and administrative expenses. Hedge ineffectiveness was immaterial for all periods presented. The following table provides information on the location and amounts of pre-tax gains and losses on our cash flow hedges for the three months ended September 30 : Change in Derivative Gains/Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion) Location of Net Derivative Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) 2018 2017 2018 2017 (in millions) Foreign exchange forward contracts – Designated as cash flow hedging instruments $ (96 ) $ 6 Cost of revenues $ 6 $ 29 Selling, general and administrative expenses 1 5 Total $ 7 $ 34 The following table provides information on the location and amounts of pre-tax gains and losses on our cash flow hedges for the nine months ended September 30 : Change in Derivative Gains/Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion) Location of Net Derivative Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) 2018 2017 2018 2017 (in millions) Foreign exchange forward contracts – Designated as cash flow hedging instruments $ (201 ) $ 165 Cost of revenues $ 54 $ 75 Selling, general and administrative expenses 9 14 Total $ 63 $ 89 The activity related to the change in net unrealized gains and losses on our cash flow hedges included in accumulated other comprehensive income (loss) is presented in Note 12 . Other Derivatives We use foreign exchange forward contracts to provide an economic hedge against balance sheet exposures to certain monetary assets and liabilities denominated in currencies, primarily the Indian rupee, British pound and Euro, other than the functional currency of our foreign subsidiaries. We entered into a series of foreign exchange forward contracts that are scheduled to mature in 2018. Realized gains or losses and changes in the estimated fair value of these derivative financial instruments are recorded in the caption "Foreign currency exchange gains (losses), net" in our consolidated statements of operations. Additional information related to our outstanding foreign exchange forward contracts not designated as hedging instruments is as follows: September 30, 2018 December 31, 2017 Notional Fair Value Notional Fair Value (in millions) Contracts outstanding $ 460 $ 2 $ 255 $ (5 ) The following table provides information on the location and amounts of realized and unrealized pre-tax gains and losses on our other derivative financial instruments for the three and nine months ended September 30 : Location of Net Gains (Losses) on Derivative Instruments Amount of Net Gains (Losses) on Derivative Instruments Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Foreign exchange forward contracts – Not designated as hedging instruments Foreign currency exchange gains (losses), net $ 3 $ (3 ) $ 23 $ (16 ) The related cash flow impacts of all of our derivative activities are reflected as cash flows from operating activities.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	We measure our cash equivalents, investments and foreign exchange forward contracts at fair value. The authoritative guidance defines fair value as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The authoritative guidance also establishes a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon their own market assumptions. The fair value hierarchy consists of the following three levels: • Level 1 – Inputs are quoted prices in active markets for identical assets or liabilities. • Level 2 – Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data. • Level 3 – Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable. The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of September 30, 2018 : Level 1 Level 2 Level 3 Total (in millions) Cash equivalents: Money market funds $ 401 $ — $ — $ 401 Commercial paper and bank deposits — 6 — 6 Total cash equivalents 401 6 — 407 Short-term investments: Time deposits (1) — 465 — 465 Available-for-sale investment securities: U.S. Treasury and agency debt securities 572 65 — 637 Corporate and other debt securities — 426 — 426 Certificates of deposit and commercial paper — 317 — 317 Asset-backed securities — 318 — 318 Municipal debt securities — 103 — 103 Total available-for-sale investment securities 572 1,229 — 1,801 Held-to-maturity investment securities: Corporate and other debt securities — 674 — 674 Commercial paper — 454 — 454 Total short-term held-to-maturity investment securities — 1,128 — 1,128 Total short-term investments (2) 572 2,822 — 3,394 Long-term investments: Held-to-maturity investment securities: Corporate and other debt securities — 6 — 6 Commercial paper — 12 — 12 Total long-term held-to-maturity investment securities — 18 — 18 Total long-term investments (3) — 18 — 18 Derivative financial instruments - foreign exchange forward contracts: Other current assets — 7 — 7 Accrued expenses and other current liabilities — (67 ) — (67 ) Other noncurrent liabilities — (48 ) — (48 ) Total $ 973 $ 2,738 $ — $ 3,711 (1) Includes $405 million in restricted time deposits. See Note 9 . (2) Excludes an equity security invested in a mutual fund valued at $25 million based on the NAV of the fund. (3) Excludes equity and cost method investments of $75 million , which are accounted for using the equity method of accounting and at cost, respectively. The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of December 31, 2017 : Level 1 Level 2 Level 3 Total (in millions) Cash equivalents: Money market funds $ 334 $ — $ — $ 334 Bank deposits — 80 — 80 Commercial paper — 386 — 386 Total cash equivalents 334 466 — 800 Short-term investments: Time deposits — 389 — 389 Available-for-sale investment securities: U.S. Treasury and agency debt securities 585 76 — 661 Corporate and other debt securities — 437 — 437 Certificates of deposit and commercial paper — 450 — 450 Asset-backed securities — 295 — 295 Municipal debt securities — 129 — 129 Total available-for-sale investment securities 585 1,387 — 1,972 Held-to-maturity investment securities: Corporate and other debt securities — 345 — 345 Commercial paper — 397 — 397 Total held-to-maturity investment securities — 742 — 742 Total short-term investments (1) 585 2,518 — 3,103 Long-term investments: Held-to-maturity investment securities: Corporate and other debt securities — 160 — 160 Total held-to-maturity investment securities — 160 — 160 Total long-term investments (2) — 160 — 160 Derivative financial instruments - foreign exchange forward contracts: Other current assets — 134 — 134 Accrued expenses and other current liabilities — (5 ) — (5 ) Other noncurrent assets — 20 — 20 Total $ 919 $ 3,293 $ — $ 4,212 (1) Excludes an equity security invested in a mutual fund valued at $25 million based on the NAV of the fund. (2) Excludes equity and cost method investments of $74 million , which are accounted for using the equity method of accounting and at cost, respectively. We measure the fair value of money market funds and U.S. Treasury securities based on quoted prices in active markets for identical assets and therefore classify these assets as Level 1. The fair value of commercial paper, certificates of deposit, U.S. government agency securities, municipal debt securities, debt securities issued by supranational institutions, U.S. and international corporate bonds and foreign government debt securities is measured based on relevant trade data, dealer quotes, or model-driven valuations using significant inputs derived from or corroborated by observable market data, such as yield curves and credit spreads. We measure the fair value of our asset-backed securities using model-driven valuations based on significant inputs derived from or corroborated by observable market data such as dealer quotes, available trade information, spread data, current market assumptions on prepayment speeds and defaults and historical data on deal collateral performance. The carrying value of deposits approximated fair value as of September 30, 2018 and December 31, 2017 . We estimate the fair value of each foreign exchange forward contract by using a present value of expected cash flows model. This model calculates the difference between the current market forward price and the contracted forward price for each foreign exchange contract and applies the difference in the rates to each outstanding contract. The market forward rates include a discount and credit risk factor. The amounts are aggregated by type of contract and maturity. During the nine months ended September 30, 2018 and the year ended December 31, 2017 , there were no transfers among Level 1, Level 2, or Level 3 financial assets and liabilities.

Stockholder's Equity

Stockholder's Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	Stock Repurchase Program We have entered into multiple accelerated stock repurchase agreements, or ASRs, under our stock repurchase program authorized by our Board of Directors. The ASR activity and related information during the nine months ended September 30, 2018 and the year ended December 31, 2017 were as follows: Purchase Period End Date Number of Shares Average Repurchase Price per Share ASR Amount (in millions) (in millions) June 2018 ASR August 2018 7.6 (1) $ 79.42 $ 600 March 2018 ASR May 2018 3.7 (2) $ 79.95 $ 300 December 2017 ASR March 2018 4.0 (3) $ 75.75 $ 300 March 2017 ASR August 2017 23.7 $ 63.19 $ 1,500 ___________________ (1) Includes 6.5 million shares initially delivered in June 2018 and 1.1 million shares delivered in August 2018 upon the final settlement of the ASR. (2) Includes 3.0 million shares initially delivered in March 2018 and 0.7 million shares delivered in May 2018 upon the final settlement of the ASR. (3) Includes 3.6 million shares initially delivered in December 2017 and 0.4 million shares delivered in March 2018 upon the final settlement of the ASR. In addition to the ASR activity above, during the nine months ended September 30, 2018, we repurchased 0.3 million shares of our Class A common stock for $25 million under our existing stock repurchase program approved by our Board of Directors. Our stock repurchase program allows for the repurchase of $3,500 million of our outstanding shares of Class A common stock, excluding fees and expenses, through December 31, 2019. As of September 30, 2018, the remaining available balance under our stock repurchase program was $775 million . Stock repurchases were also made in connection with our stock-based compensation plans, whereby Company shares were tendered by employees for payment of applicable statutory tax withholdings. In 2017, we also repurchased a limited number of shares from employees at the repurchase date market price. For the nine months ended September 30, 2018 and 2017, such repurchases totaled 0.9 million shares at an aggregate cost of $69 million , and 0.9 million shares at an aggregate cost of $57 million , respectively. Dividends Dividends on our Class A common stock, including dividend equivalents, during the periods presented were as follows: Dividends per Share Amount (in millions) 2018: Three months ended March 31, 2018 $ 0.20 $ 119 Three months ended June 30, 2018 0.20 119 Three months ended September 30, 2018 0.20 117 Nine months ended September 30, 2018 $ 355 2017: Three months ended June 30, 2017 $ 0.15 $ 89 Three months ended September 30, 2017 0.15 90 Three months ended December 31, 2017 0.15 89 Year ended December 31, 2017 $ 268 Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) by component were as follows for the three and nine months ended September 30, 2018 : Three Months Nine Months Before Tax Amount Tax Effect Net of Tax Amount Before Tax Tax Net of Tax (in millions) Foreign currency translation adjustments: Beginning balance $ (79 ) $ 7 $ (72 ) $ (38 ) $ — $ (38 ) Change in foreign currency translation adjustments (14 ) 2 (12 ) (55 ) 9 (46 ) Ending balance $ (93 ) $ 9 $ (84 ) $ (93 ) $ 9 $ (84 ) Unrealized (losses) on available-for-sale investment securities: Beginning balance $ (19 ) $ 5 $ (14 ) $ (11 ) $ 4 $ (7 ) Cumulative effect of change in accounting principle (1) — — — — (1 ) (1 ) Net unrealized (losses) arising during the period (1 ) — (1 ) (11 ) 2 (9 ) Reclassification of net losses to Other, net 1 — 1 3 — 3 Net change — — — (8 ) 1 (7 ) Ending balance $ (19 ) $ 5 $ (14 ) $ (19 ) $ 5 $ (14 ) Unrealized gains on cash flow hedges: Beginning balance $ (7 ) $ (1 ) $ (8 ) $ 154 $ (39 ) $ 115 Unrealized (losses) arising during the period (96 ) 20 (76 ) (201 ) 44 (157 ) Reclassifications of net (gains) to: Cost of revenues (6 ) 1 (5 ) (54 ) 13 (41 ) Selling, general and administrative expenses (1 ) — (1 ) (9 ) 2 (7 ) Net change (103 ) 21 (82 ) (264 ) 59 (205 ) Ending balance $ (110 ) $ 20 $ (90 ) $ (110 ) $ 20 $ (90 ) Accumulated other comprehensive income (loss): Beginning balance $ (105 ) $ 11 $ (94 ) $ 105 $ (35 ) $ 70 Other comprehensive income (loss) (117 ) 23 (94 ) (327 ) 69 (258 ) Ending balance $ (222 ) $ 34 $ (188 ) $ (222 ) $ 34 $ (188 ) (1) Reflects the adoption of accounting standards as described in Note 1 . Changes in accumulated other comprehensive income (loss) by component were as follows for the three and nine months ended September 30, 2017 : Three Months Nine Months Before Tax Amount Tax Effect Net of Tax Amount Before Tax Tax Net of Tax (in millions) Foreign currency translation adjustments: Beginning balance $ (82 ) $ — $ (82 ) $ (149 ) $ — $ (149 ) Change in foreign currency translation adjustments 33 — 33 100 — 100 Ending balance $ (49 ) $ — $ (49 ) $ (49 ) $ — $ (49 ) Unrealized gains (losses) on available-for-sale investment securities: Beginning balance $ (3 ) $ 1 $ (2 ) $ (6 ) $ 2 $ (4 ) Net unrealized (losses) gains arising during the period (1 ) — (1 ) 2 (1 ) 1 Reclassification of net losses to Other, net 1 — 1 1 — 1 Net change — — — 3 (1 ) 2 Ending balance $ (3 ) $ 1 $ (2 ) $ (3 ) $ 1 $ (2 ) Unrealized gains on cash flow hedges: Beginning balance $ 155 $ (38 ) $ 117 $ 51 $ (12 ) $ 39 Unrealized gains arising during the period 6 (2 ) 4 165 (41 ) 124 Reclassifications of net (gains) to: Cost of revenues (29 ) 7 (22 ) (75 ) 18 (57 ) Selling, general and administrative expenses (5 ) 1 (4 ) (14 ) 3 (11 ) Net change (28 ) 6 (22 ) 76 (20 ) 56 Ending balance $ 127 $ (32 ) $ 95 $ 127 $ (32 ) $ 95 Accumulated other comprehensive income (loss): Beginning balance $ 70 $ (37 ) $ 33 $ (104 ) $ (10 ) $ (114 ) Other comprehensive income (loss) 5 6 11 179 (21 ) 158 Ending balance $ 75 $ (31 ) $ 44 $ 75 $ (31 ) $ 44

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	We are involved in various claims and legal actions arising in the ordinary course of business. We accrue a liability when a loss is considered probable and the amount can be reasonably estimated. When a material loss contingency is reasonably possible but not probable, we do not record a liability, but instead disclose the nature and the amount of the claim, and an estimate of the loss or range of loss, if such an estimate can be made. Legal fees are expensed as incurred. In the opinion of management, the outcome of any existing claims and legal or regulatory proceedings, other than the specific matters described below, if decided adversely, is not expected to have a material adverse effect on our business, financial condition, results of operations and cash flows. We have substantially completed our internal investigation focused on whether certain payments relating to Company-owned facilities in India were made improperly and in possible violation of the FCPA and other applicable laws. The investigation, which began in 2016, has also examined various other payments made in small amounts in India that may not have complied with Company policy or applicable law. In September 2016, we voluntarily notified the DOJ and SEC and are cooperating fully with both agencies. The investigation has been conducted under the oversight of the Audit Committee, with the assistance of outside counsel. In connection with the investigation, during the year ended December 31, 2016, we recorded out-of-period corrections related to $4 million of potentially improper payments between 2009 and 2016 that had been previously capitalized when they should have been expensed. These out-of-period corrections were not material to any previously issued financial statements. There were no adjustments recorded during 2018 and 2017 related to the amounts under investigation. The Company’s discussions with the DOJ and SEC have progressed to a point where the Company can now reasonably estimate a probable loss and has recorded the FCPA Accrual of $28 million in the caption “Accrued expenses and other current liabilities” in our consolidated statements of financial position. There can be no assurance as to the timing of a final resolution of these matters with the DOJ and SEC. The DOJ and the SEC have a broad range of civil and criminal sanctions under the FCPA and other laws and regulations including injunctive relief, disgorgement, fines, penalties, modifications to business practices, including the termination or modification of existing business relationships, the imposition of compliance programs and the retention of a monitor to oversee compliance with the FCPA. The Company will continue to evaluate the amount of its liability pending final resolution of the discussions with the DOJ and SEC. In addition, the DOJ and the SEC could bring enforcement actions against the Company or individuals, including former members of senior management. Such actions, if brought, could result in dispositions, judgments, settlements, fines, injunctions, cease and desist orders, debarment or other civil or criminal penalties against the Company or such individuals. The Company cannot currently assess the potential liability that might be incurred if a settlement is not reached and the government were to litigate the matter. As such, based on the information available at this time any additional liability related to this matter is not reasonably estimable. We expect to incur additional expenses related to remedial measures, and may incur additional expenses related to fines. The imposition of any sanctions or the implementation of remedial measures could have a material adverse effect on our business, annual and interim results of operations, cash flows and financial condition. On October 5, 2016, October 27, 2016, and November 18, 2016, three putative securities class action complaints were filed in the United States District Court for the District of New Jersey, naming us and certain of our current and former officers as defendants. In an order dated February 3, 2017, the United States District Court for the District of New Jersey consolidated the three putative securities class actions into a single action and appointed lead plaintiffs and lead counsel. On April 7, 2017, the lead plaintiffs filed a consolidated amended complaint on behalf of a putative class of stockholders who purchased our common stock during the period between February 27, 2015 and September 29, 2016, naming us and certain of our current and former officers as defendants and alleging violations of the Exchange Act, based on allegedly false or misleading statements related to potential violations of the FCPA, our business, prospects and operations, and the effectiveness of our internal controls over financial reporting and our disclosure controls and procedures. The lead plaintiffs seek an award of compensatory damages, among other relief, and their reasonable costs and expenses, including attorneys’ fees. Defendants filed a motion to dismiss the consolidated amended complaint on June 6, 2017, and the motion to dismiss was fully briefed as of September 5, 2017. On August 8, 2018, the Court issued an order which granted the motion to dismiss in part, including dismissal of all claims against current officers of the Company, and denied them in part. On September 7, 2018, we filed a motion in the United States District Court for the District of New Jersey to certify the August 8, 2018 order for immediate appeal to the United States Court of Appeals for the Third Circuit pursuant to 28 U.S.C. § 1292(b). Plaintiffs filed a response to the motion on September 28, 2018, and we filed a reply on October 9, 2018. On October 31, 2016, November 15, 2016, and November 18, 2016, three putative shareholder derivative complaints were filed in New Jersey Superior Court, Bergen County, naming us, all of our then current directors and certain of our current and former officers as defendants. On January 24, 2017, the New Jersey Superior Court, Bergen County, consolidated the three putative shareholder derivative actions filed in that court into a single action and appointed lead plaintiff and lead counsel. The complaints assert claims for breach of fiduciary duty, corporate waste, unjust enrichment, abuse of control, mismanagement, and/or insider selling by defendants. On March 16, 2017, the parties filed a stipulation deferring all further proceedings pending a final, non-appealable ruling on the then anticipated motion to dismiss the consolidated putative securities class action. On April 26, 2017, in lieu of ordering the stipulation filed by the parties, the New Jersey Superior Court deferred further proceedings by dismissing the consolidated putative shareholder derivative litigation without prejudice but permitting the parties to file a motion to vacate the dismissal in the future. On February 22, 2017, a fourth putative shareholder derivative complaint asserting similar claims was filed in the United States District Court for the District of New Jersey, naming us and certain of our then current directors as defendants. On April 5, 2017, the United States District Court for the District of New Jersey entered an order staying all proceedings pending a final, non-appealable ruling on the then anticipated motion to dismiss the consolidated putative securities class action. On April 7, 2017, a fifth putative shareholder derivative complaint was filed in the United States District Court for the District of New Jersey, naming us, certain of our then current directors, and certain of our current and former officers as defendants. The complaint in that action asserts claims similar to those in the previously-filed putative shareholder derivative actions, but also adds a claim for violations of Section 10(b) of the Exchange Act against the individual defendants. On May 10, 2017, a sixth putative shareholder derivative complaint was filed in the United States District Court for the District of New Jersey, naming us, certain of our then current directors, and certain of our current and former officers as defendants. The complaint in that action asserts claims similar to those in the previously-filed putative shareholder derivative actions, but also adds a claim for violations of Section 14(a) of the Exchange Act against the individual defendants. In an order dated June 20, 2017, the United States District Court for the District of New Jersey consolidated the three putative shareholder derivative actions filed in that court into a single action, appointed lead plaintiff and lead counsel, and stayed all further proceedings pending a final, non-appealable ruling on the motions to dismiss the consolidated putative securities class action. All of the putative shareholder derivative complaints allege among other things that certain of our public disclosures were false and misleading by failing to disclose that payments allegedly in violation of the FCPA had been made and by asserting that management had determined that our internal controls were effective. The plaintiffs seek awards of compensatory damages and restitution to the Company as a result of the alleged violations and their costs and attorneys’ fees, experts’ fees, and other litigation expenses, among other relief. We are presently unable to predict the duration, scope or result of the consolidated putative securities class action, the putative shareholder derivative actions or any other lawsuits. As such, we are presently unable to develop a reasonable estimate of a possible loss or range of losses, if any, and thus have not recorded any accruals related to these matters. While the Company intends to defend the lawsuits vigorously, these lawsuits and any other related lawsuits are subject to inherent uncertainties, the actual cost of such litigation will depend upon many unknown factors and the outcome of the litigation is necessarily uncertain. We have indemnification and expense advancement obligations pursuant to our Bylaws and indemnification agreements with respect to certain current and former members of senior management and the Company’s directors. In connection with the internal investigation, we have received requests under such indemnification agreements and our Bylaws to provide funds for legal fees and other expenses, and expect additional requests in connection with the investigation and related litigation. We have not recorded any liability for these matters as of September 30, 2018 as we cannot estimate the ultimate outcome at this time but have expensed payments made through September 30, 2018. We have maintained directors and officers insurance, from which a portion of the indemnification expenses and costs related to the putative securities class action complaints may be recoverable, and have recorded an insurance receivable of less than $1 million as of September 30, 2018. See Note 9 for information relating to the ITD Dispute. Many of our engagements involve projects that are critical to the operations of our customers’ business and provide benefits that are difficult to quantify. Any failure in a customer’s systems or our failure to meet our contractual obligations to our customers, including any breach involving a customer’s confidential information or sensitive data, or our obligations under applicable laws or regulations could result in a claim for substantial damages against us, regardless of our responsibility for such failure. Although we attempt to contractually limit our liability for damages arising from negligent acts, errors, mistakes, or omissions in rendering our services, there can be no assurance that the limitations of liability set forth in our contracts will be enforceable in all instances or will otherwise protect us from liability for damages. Although we have general liability insurance coverage, including coverage for errors or omissions, there can be no assurance that such coverage will cover all types of claims, continue to be available on reasonable terms or will be available in sufficient amounts to cover one or more large claims, or that the insurer will not disclaim coverage as to any future claim. The successful assertion of one or more large claims against us that exceed or are not covered by our insurance coverage or changes in our insurance policies, including premium increases or the imposition of large deductible or co-insurance requirements, could have a material adverse effect on our business, results of operations, financial condition and cash flows. In the normal course of business and in conjunction with certain customer engagements, we have entered into contractual arrangements through which we may be obligated to indemnify customers or other parties with whom we conduct business with respect to certain matters. These arrangements can include provisions whereby we agree to hold the indemnified party and certain of their affiliated entities harmless with respect to third-party claims related to such matters as our breach of certain representations or covenants, our intellectual property infringement, our gross negligence or willful misconduct or certain other claims made against certain parties. Payments by us under any of these arrangements are generally conditioned on the customer making a claim and providing us with full control over the defense and settlement of such claim. It is not possible to determine the maximum potential liability under these indemnification agreements due to the unique facts and circumstances involved in each particular agreement. Historically, we have not made payments under these indemnification agreements and therefore they have not had any impact on our operating results, financial position, or cash flows. However, if events arise requiring us to make payment for indemnification claims under our indemnification obligations in contracts we have entered, such payments could have material impact on our business, results of operations, financial condition and cash flows.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Brackett B. Denniston, III was the Interim General Counsel and an executive officer of the Company from December 2016 until May 15, 2017, during which period Mr. Denniston was also a Senior Counsel at the law firm of Goodwin Procter LLP, or Goodwin. During the three and nine months ended September 30, 2017, Goodwin performed legal services for the Company for which it earned approximately $1 million and $4 million , respectively. For such period and other periods when Goodwin was a related party of the Company, the provision of legal services from Goodwin was reviewed and approved by our Audit Committee. During the nine months ended September 30, 2018, Goodwin was not a related party of the Company.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Information	Our reportable segments are: • Financial Services, which consists of our banking and insurance operating segments; • Healthcare, which consists of our healthcare and life sciences operating segments; • Products and Resources, which consists of our retail and consumer goods, manufacturing and logistics, travel and hospitality, and energy and utilities operating segments; and • Communications, Media and Technology, which includes our communications and media operating segment and our technology operating segment. Our sales managers, account executives, account managers and project teams are aligned in accordance with the specific industries they serve. Our chief operating decision maker evaluates the Company’s performance and allocates resources based on segment revenues and operating profit. Segment operating profit is defined as income from operations before unallocated costs. Generally, operating expenses for each operating segment have similar characteristics and are subject to the same factors, pressures and challenges. However, the economic environment and its effects on industries served by our operating segments may affect revenues and operating expenses to differing degrees. In 2018, we made changes to the internal measurement of segment operating profits for the purpose of evaluating segment performance and resource allocation. The primary reason for the changes is to charge to our business segments costs that are directly managed and controlled by them. Specifically, segment operating profit now includes the stock-based compensation expense of sales managers, account executives, account managers and project teams, which was previously included in "unallocated costs." In addition, we have changed the methodology of charging our business segments for the use of our global delivery centers and infrastructure from a fixed per employee charge to a variable per employee charge that differs depending on location and assets deployed. We have reported our segment operating profits using the new measurement methodology and have restated the prior period results to conform to the new methodology. Expenses included in segment operating profit consist principally of direct selling and delivery costs (including stock-based compensation expense) as well as a per employee charge for use of our global delivery centers and infrastructure. Certain selling, general and administrative expenses, excess or shortfall of incentive compensation for delivery personnel as compared to target, costs related to our realignment program, a portion of depreciation and amortization and the impact of the settlements of our cash flow hedges are not allocated to individual segments in internal management reports used by the chief operating decision maker. Accordingly, such expenses are excluded from segment operating profit and are separately disclosed as “unallocated costs” and adjusted against our total income from operations. Additionally, management has determined that it is not practical to allocate identifiable assets by segment, since such assets are used interchangeably among the segments. As described in Note 3 to our unaudited consolidated financial statements, on January 1, 2018, we adopted the New Revenue Standard, using the modified retrospective method. Results for reporting periods beginning after January 1, 2018 are presented under the New Revenue Standard, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting policies. Revenues from external customers and segment operating profits, before unallocated expenses, by reportable segment were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Revenues: Financial Services $ 1,464 $ 1,427 $ 4,394 $ 4,209 Healthcare 1,189 1,085 3,466 3,138 Products and Resources 863 774 2,524 2,258 Communications, Media and Technology 562 480 1,612 1,377 Total revenues $ 4,078 $ 3,766 $ 11,996 $ 10,982 Segment Operating Profit: Financial Services $ 446 $ 476 $ 1,355 $ 1,348 Healthcare 382 352 1,077 971 Products and Resources 267 248 781 695 Communications, Media and Technology 184 159 522 450 Total segment operating profit 1,279 1,235 3,735 3,464 Less: unallocated costs 534 587 1,627 1,640 Income from operations $ 745 $ 648 $ 2,108 $ 1,824 Geographic Area Information Revenue and long-lived assets, by geographic area, are as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Revenues: (1) North America (2) $ 3,107 $ 2,891 $ 9,149 $ 8,503 United Kingdom 325 301 944 863 Rest of Europe 398 327 1,153 903 Europe - Total 723 628 2,097 1,766 Rest of World (3) 248 247 750 713 Total revenues $ 4,078 $ 3,766 $ 11,996 $ 10,982 As of September 30, 2018 December 31, 2017 (in millions) Long-lived Assets: (4) North America (2) $ 420 $ 360 Europe 90 63 Rest of World (3)(5) 852 901 Total $ 1,362 $ 1,324 ________________ (1) Revenues are attributed to regions based upon customer location. (2) Substantially all relates to operations in the United States. (3) Includes our operations in Asia Pacific, the Middle East and Latin America. (4) Long-lived assets include property and equipment, net of accumulated depreciation and amortization. (5) Substantially all of these long-lived assets relate to our operations in India.

Subsequent Events (Notes)

Subsequent Events (Notes)	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Acquisitions In the fourth quarter of 2018, we entered into an agreement to acquire Softvision and completed the acquisitions of Advanced Technology Group, or ATG, and SaaSfocus. The combined preliminary purchase price for these three transactions is approximately $635 million . Softvision is a privately held digital engineering and consulting company that focuses on agile development of custom cloud-based software and platforms. The acquisition of Softvision will expand our digital engineering practice and is expected to close during the fourth quarter of 2018. ATG is a privately held consulting firm that helps companies plan, implement, and optimize automated cloud-based Quote-to-Cash business processes and technologies. SaaSfocus is a privately held consulting firm specializing in digital transformation, leveraging the Salesforce platform. The SaaSfocus and ATG acquisitions are expected to strengthen and expand our Salesforce practice. Dividend On October 29, 2018, our Board of Directors approved the Company's declaration of a $0.20 per share dividend with a record date of November 20, 2018 and a payment date of November 30, 2018.

Interim Consolidated Financia_2

Interim Consolidated Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Recently Adopted/New Accounting Pronouncements	Recently Adopted Accounting Pronouncements Date Issued and Topic Date Adopted and Method Description Impact May 2014 January 1, 2018 Modified Retrospective The new standard, as amended, sets forth a single comprehensive model for recognizing and reporting revenues. The standard also requires additional financial statement disclosures that enable users to understand the nature, amount, timing and uncertainty of revenues and cash flows relating to customer contracts. The standard allows for two methods of adoption: the full retrospective adoption, which requires the standard to be applied to each prior period presented, or the modified retrospective adoption, which requires the cumulative effect of adoption to be recognized as an adjustment to opening retained earnings in the period of adoption. See Note 3 for the impact of adoption of this standard. November 2016 Statement of Cash Flows January 1, 2018 Retrospective This update requires restricted cash to be included with cash and cash equivalents when reconciling the beginning and ending amounts on the statement of cash flows. It also requires a reconciliation of such totals to the amounts on the statement of financial position and disclosure as to the nature of the restrictions. There were no restricted cash balances as of September 30, 2018. The adoption of this update had no impact on our financial statements for the three and nine months ended September 30, 2018. February 2018 January 1, 2018 In the period of adoption This update provides an option for entities to reclassify stranded tax effects caused by the recently-enacted Tax Cuts and Jobs Act, or Tax Reform Act, from accumulated other comprehensive income to retained earnings. We have early adopted this update as of January 1, 2018. The adoption resulted in a decrease of $1 million in accumulated other comprehensive income and a corresponding increase of $1 million to opening retained earnings. New Accounting Pronouncements Date Issued and Topic Effective Date Description Impact February 2016 January 1, 2019 The new standard replaces the existing guidance on leases and requires the lessee to recognize a right-of-use asset and a lease liability for all leases with lease terms equal to or greater than twelve months. For finance leases, the lessee would recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee would recognize total lease expense on a straight-line basis. The standard offers several practical expedients for transition and certain expedients specific to lessees or lessors. The standard allows for two methods of adoption: retrospective to each prior reporting period presented with the cumulative effect of adoption recognized at the beginning of the earliest period presented or retrospective to the beginning of the period of adoption through a cumulative-effect adjustment. While we are continuing to evaluate the provisions of this standard, the primary effect will be to require recording of right-of-use assets and corresponding lease obligations for current operating leases. We expect the adoption of this standard to have a material impact on our consolidated statement of financial position, but not on the consolidated statements of operations or cash flows. As of December 31, 2017, our undiscounted operating lease commitments were $943 million. We are currently planning to elect the package of practical expedients which permits us to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs. We intend to adopt the standard retrospectively to the beginning of the period of adoption through a cumulative-effect adjustment. March 2017 January 1, 2019 This update shortens the amortization period for certain callable debt securities held at a premium to the earliest call date. The amendments do not require an accounting change for securities held at a discount. Upon adoption, entities will be required to use a modified retrospective transition with the cumulative effect adjustment recognized to retained earnings as of the beginning of the period of adoption. We do not expect the adoption of this update to have a material impact on our financial statements. August 2018 Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement (CCA) that is a Service Contract January 1, 2020 This update aligns the accounting for costs incurred to implement a CCA that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. The update clarifies that a customer should capitalize certain implementation costs and subsequently amortize such costs over the term of the hosting arrangement as operating expenses. We are currently evaluating the effect this update will have on our consolidated financial statements and related disclosures.
Revenue from Contract with Customer	Our contract liabilities, or deferred revenue, consist of advance payments and billings in excess of revenues recognized. We classify deferred revenue as current or noncurrent based on the timing of when we expect to recognize the revenues. The noncurrent portion of deferred revenue is included in other noncurrent liabilities in our consolidated statements of financial position. Our contract assets and liabilities are reported in a net position on a contract by contract basis at the end of each reporting period. The difference between the opening and closing balances of our contract assets and deferred revenues primarily results from the timing difference between our performance obligations and the customer’s payment. We receive payments from customers based on the terms established in our contracts, which vary by contract type. Revenues recognized during the nine months ended September 30, 2018 for performance obligations satisfied or partially satisfied in previous periods were immaterial. Revenue Recognition We recognize revenues as we transfer control of deliverables (products, solutions and services) to our customers in an amount reflecting the consideration to which we expect to be entitled. To recognize revenues, we apply the following five step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenues when a performance obligation is satisfied. We account for a contract when it has approval and commitment from all parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company applies judgment in determining the customer’s ability and intention to pay, which is based on a variety of factors including the customer’s historical payment experience. We may enter into arrangements that consist of multiple performance obligations. Such arrangements may include any combination of our deliverables. To the extent a contract includes multiple promised deliverables, we apply judgment to determine whether promised deliverables are capable of being distinct and are distinct in the context of the contract. If these criteria are not met, the promised deliverables are accounted for as a combined performance obligation. For arrangements with multiple distinct performance obligations, we allocate consideration among the performance obligations based on their relative standalone selling price. Standalone selling price is the price at which we would sell a promised good or service separately to the customer. When not directly observable, we typically estimate standalone selling price by using the expected cost plus a margin approach. We typically establish a standalone selling price range for our deliverables, which is reassessed on a periodic basis or when facts and circumstances change. For performance obligations where control is transferred over time, revenues are recognized based on the extent of progress towards completion of the performance obligation. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the deliverables to be provided. Revenues related to fixed-price contracts for application development and systems integration services, consulting or other technology services are recognized as the service is performed using the cost to cost method, under which the total value of revenues is recognized on the basis of the percentage that each contract’s total labor cost to date bears to the total expected labor costs. Revenues related to fixed-price application maintenance, testing and business process services are recognized based on our right to invoice for services performed for contracts in which the invoicing is representative of the value being delivered, in accordance with the practical expedient in ASC 606-10-55-18. If our invoicing is not consistent with value delivered, revenues are recognized as the service is performed based on the cost to cost method described above. The cost to cost method requires estimation of future costs, which is updated as the project progresses to reflect the latest available information; such estimates and changes in estimates involve the use of judgment. The cumulative impact of any revision in estimates is reflected in the financial reporting period in which the change in estimate becomes known and any anticipated losses on contracts are recognized immediately. Revenues related to fixed-price hosting and infrastructure services are recognized based on our right to invoice for services performed for contracts in which the invoicing is representative of the value being delivered, in accordance with the practical expedient in ASC 606-10-55-18. If our invoicing is not consistent with value delivered, revenues are recognized on a straight-line basis unless revenues are earned and obligations are fulfilled in a different pattern. The revenue recognition method applied to the types of contracts described above provides the most faithful depiction of performance towards satisfaction of our performance obligations; for example, the cost to cost method is used when the value of services provided to the customer is best represented by the costs expended to deliver those services. Revenues related to our non-hosted software license arrangements that do not require significant modification or customization of the underlying software are recognized when the software is delivered as control is transferred at a point in time. For software license arrangements that require significant functionality enhancements or modification of the software, revenues for the software license and related services are recognized as the services are performed in accordance with the methods described above. In software hosting arrangements, the rights provided to the customer, such as ownership of a license, contract termination provisions and the feasibility of the client to operate the software, are considered in determining whether the arrangement includes a license or a service. Sales and usage-based fees promised in exchange for licenses of intellectual property are not recognized as revenue until the uncertainty related to the variable amounts is resolved. Revenues related to software maintenance and support are generally recognized on a straight-line basis over the contract period. Revenues related to our time-and-materials, transaction-based or volume-based contracts are recognized over the period the services are provided in a manner that corresponds with the value transferred to the customer to-date relative to the remaining services to be provided. Revenues also include the reimbursement of out-of-pocket expenses. Our warranties generally provide a customer with assurance that the related deliverable will function as the parties intended because it complies with agreed-upon specifications and is therefore not considered an additional performance obligation in the contract. From time to time, we may enter into arrangements with third party suppliers to resell products or services. In such cases, we evaluate whether we are the principal (i.e. report revenues on a gross basis) or agent (i.e. report revenues on a net basis). In doing so, we first evaluate whether we control the good or service before it is transferred to the customer. If we control the good or service before it is transferred to the customer, we are the principal; if not, we are the agent. Determining whether we control the good or service before it is transferred to the customer may require judgment. Our contracts may be modified to add, remove or change existing performance obligations. The accounting for modifications to our contracts involves assessing whether the services added to an existing contract are distinct and whether the pricing is at the standalone selling price. Services added that are not distinct are accounted for on a cumulative catch up basis, while those that are distinct are accounted for prospectively, either as a separate contract if the additional services are priced at the standalone selling price, or as a termination of the existing contract and creation of a new contract if not priced at the standalone selling price. Services added to our application development and systems integration service contracts are typically not distinct, while services added to our other contracts, including application maintenance, testing and business process services contracts, are typically distinct. Incentive revenues, volume discounts, or any other form of variable consideration is estimated using either the sum of probability weighted amounts in a range of possible consideration amounts (expected value), or the single most likely amount in a range of possible consideration amounts (most likely amount), depending on which method better predicts the amount of consideration to which we may be entitled. We include in the transaction price variable consideration only to the extent it is probable that a significant reversal of revenues recognized will not occur when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in the transaction price may involve judgment and are based largely on an assessment of our anticipated performance and all information that is reasonably available to us. We assess the timing of the transfer of goods or services to the customer as compared to the timing of payments to determine whether a significant financing component exists. As a practical expedient, we do not assess the existence of a significant financing component when the difference between payment and transfer of deliverables is a year or less. If the difference in timing arises for reasons other than the provision of finance to either the customer or us, no financing component is deemed to exist. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our services, not to receive or provide financing from or to customers. We do not consider set up or transition fees paid upfront by our customers to represent a financing component, as such fees are required to encourage customer commitment to the project and protect us from early termination of the contract. Costs to Fulfill Recurring operating costs for contracts with customers are recognized as incurred. Certain eligible, nonrecurring costs incurred in the initial phases of our application maintenance, business process outsourcing and infrastructure services contracts (i.e. set-up or transition costs) are capitalized when such costs (1) relate directly to the contract, (2) generate or enhance resources of the Company that will be used in satisfying the performance obligation in the future, and (3) are expected to be recovered. These costs are expensed ratably over the estimated life of the customer relationship, including expected renewals. In determining the estimated life of the customer relationship, we evaluate the average contract term, on a portfolio basis by nature of the services to be provided, and apply judgment to evaluate the rate of technological and industry change. Capitalized amounts are monitored regularly for impairment. Impairment losses are recorded when projected remaining undiscounted operating cash flows are not sufficient to recover the carrying amount of the capitalized costs to fulfill. Trade Accounts Receivable and Contract Balances We classify our right to consideration in exchange for deliverables as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional (i.e. only the passage of time is required before payment is due). For example, we recognize a receivable for revenues related to our time and materials and transaction or volume-based contracts when earned regardless of whether amounts have been billed. We present such receivables in Trade accounts receivable, net in our consolidated statements of financial position at their net estimated realizable value. We maintain an allowance for doubtful accounts to provide for the estimated amount of receivables that may not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience, the age of outstanding receivables and other applicable factors. A contract asset is a right to consideration that is conditional upon factors other than the passage of time. Contract assets are presented in Other current assets in our consolidated statements of financial position and primarily relate to unbilled amounts on fixed-price contracts utilizing the cost to cost method of revenue recognition.

Revenues (Tables)

Revenues (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Effect of New Accounting Pronouncements	The following tables compare the financial statement line items materially affected by the adoption of the New Revenue Standard as of and for the three and nine months ended September 30, 2018 to the pro-forma amounts had the previous guidance been in effect, or Pro-forma Amounts: September 30, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) Assets: Trade accounts receivable, net (1), (2) $ 3,187 $ 3,073 $ 114 Unbilled accounts receivable (1), (3) — 432 (432 ) Other current assets (2), (3) 777 457 320 Total current assets 2 Other noncurrent assets (4) 643 589 54 Total assets $ 56 Liabilities: Deferred revenue (2) $ 244 $ 417 $ (173 ) Total current liabilities (173 ) Deferred revenue, noncurrent (2) 72 106 (34 ) Deferred income tax liabilities, net (5) 157 100 57 Total liabilities (150 ) Stockholders’ equity: Retained earnings 11,041 10,835 206 Total stockholders’ equity 206 Total liabilities and stockholders’ equity $ 56 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) (in millions) Revenues (2) $ 4,078 $ 4,045 $ 33 $ 11,996 $ 11,911 $ 85 Cost of revenues (4) 2,480 2,484 (4 ) 7,298 7,317 (19 ) Selling, general and administrative expenses 734 734 — 2,250 2,250 — Depreciation and amortization expense 119 119 — 340 340 — Income from operations 745 708 37 2,108 2,004 104 Other income (expense), net (83 ) (84 ) 1 (126 ) (127 ) 1 Income before provision for income taxes (5) 662 624 38 1,982 1,877 105 Provision for income taxes (185 ) (178 ) (7 ) (530 ) (510 ) (20 ) Income (loss) from equity method investment — — — 1 1 — Net income $ 477 $ 446 $ 31 $ 1,453 $ 1,368 $ 85 Basic earnings per share $ 0.82 $ 0.77 $ 0.05 $ 2.49 $ 2.34 $ 0.15 Diluted earnings per share $ 0.82 $ 0.77 $ 0.05 $ 2.48 $ 2.34 $ 0.14 (1) Reflects the reclassification of balances representing receivables, as defined by the New Revenue Standard, from Unbilled accounts receivable to Trade accounts receivable, net. (2) Reflects the impact of changes in the method used to measure progress on our fixed-price application maintenance, consulting and business process services contracts and the timing of revenue recognition and allocation of purchase price on our software license contracts. (3) Reflects the reclassification of balances representing contract assets, as defined by the New Revenue Standard, from Unbilled accounts receivable to Other current assets. (4) Reflects the impact of a longer period of amortization for costs to fulfill a contract. (5) Reflects the income tax impact of the above items.
Capitalized Costs to Fulfill Contract with Customer	The following table presents information related to the capitalized costs to fulfill, such as set-up or transition activities, for the nine months ended September 30, 2018 . Costs to fulfill are recorded in "Other noncurrent assets" in our consolidated statements of financial position. Costs to obtain contracts were immaterial for the periods disclosed. Costs to Fulfill (in millions) Balance - January 1, 2018 $ 303 Amortization expense (50 ) Costs capitalized 132 Other (2 ) Balance - September 30, 2018 $ 383
Contract with Customer, Asset and Liability	The table below shows significant movements in contract assets: Contract Assets (in millions) Balance - January 1, 2018 $ 306 Revenues recognized during the period but not billed 290 Amounts reclassified to accounts receivable (273 ) Other (3 ) Balance - September 30, 2018 $ 320 The table below shows significant movements in the deferred revenue balances (current and noncurrent) for the period disclosed: Deferred Revenue (in millions) Balance - January 1, 2018 $ 431 Amounts billed but not recognized as revenues 116 Revenues recognized related to the opening balance of deferred revenue (230 ) Other (1 ) Balance - September 30, 2018 $ 316
Disaggregation of Revenue	The table below presents disaggregated revenues from contracts with customers by customer location, service line and contract-type for each of our business segments. We believe this disaggregation best depicts how the nature, amount, timing and uncertainty of our revenues and cash flows are affected by industry, market and other economic factors. Three Months Ended September 30, 2018 Financial Services Healthcare Products and Resources Communications, Media and Technology Total (in millions) Revenues Geography: North America $ 1,033 $ 1,084 $ 609 $ 381 $ 3,107 United Kingdom 127 23 90 85 325 Rest of Europe 170 69 109 50 398 Europe - Total 297 92 199 135 723 Rest of World 134 13 55 46 248 Total $ 1,464 $ 1,189 $ 863 $ 562 $ 4,078 Service line: Consulting and technology services $ 902 $ 645 $ 512 $ 292 $ 2,351 Outsourcing services 562 544 351 270 1,727 Total $ 1,464 $ 1,189 $ 863 $ 562 $ 4,078 Type of contract: Time and materials $ 954 $ 464 $ 374 $ 354 $ 2,146 Fixed-price 453 452 392 187 1,484 Transaction or volume-based 57 273 97 21 448 Total $ 1,464 $ 1,189 $ 863 $ 562 $ 4,078 Nine Months Ended September 30, 2018 Financial Services Healthcare Products and Resources Communications, Media and Technology Total (in millions) Revenues Geography: North America $ 3,133 $ 3,167 $ 1,766 $ 1,083 $ 9,149 United Kingdom 357 68 266 253 944 Rest of Europe 497 191 327 138 1,153 Europe - Total 854 259 593 391 2,097 Rest of World 407 40 165 138 750 Total $ 4,394 $ 3,466 $ 2,524 $ 1,612 $ 11,996 Service line: Consulting and technology services $ 2,658 $ 1,896 $ 1,492 $ 859 $ 6,905 Outsourcing services 1,736 1,570 1,032 753 5,091 Total $ 4,394 $ 3,466 $ 2,524 $ 1,612 $ 11,996 Type of contract: Time and materials $ 2,842 $ 1,364 $ 1,122 $ 995 $ 6,323 Fixed-price 1,384 1,406 1,120 545 4,455 Transaction or volume-based 168 696 282 72 1,218 Total $ 4,394 $ 3,466 $ 2,524 $ 1,612 $ 11,996

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The allocations of preliminary purchase price to the fair value of the aggregate assets acquired and liabilities assumed were as follows: Fair Value Weighted Average Useful Life (in millions) Cash $ 9 Current assets 37 Property, plant and equipment and other noncurrent assets 7 Non-deductible goodwill (1) 344 Customer relationship intangible assets 122 9.7 years Other intangible assets 26 2.4 years Current liabilities (14 ) Noncurrent liabilities (39 ) Purchase price $ 492 (1) The primary items that generated goodwill are the value of the acquired assembled workforces and synergies between the acquired companies and us, neither of which qualify as an amortizable intangible asset.

Realignment Charges (Tables)

Realignment Charges (Tables)	9 Months Ended
	Sep. 30, 2018
Realignment Charges [Abstract]
Realignment Charges	Realignment charges were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Employee separations $ 11 $ 14 $ 11 $ 53 Advisory fees — 5 — 15 Lease termination costs — — 1 1 Total realignment costs $ 11 $ 19 $ 12 $ 69

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2018
Schedule of Investments [Line Items]
Investments	Our investments were as follows: September 30, 2018 December 31, 2017 (in millions) Short-term investments: Equity investment securities $ 25 $ 25 Available-for-sale investment securities 1,801 1,972 Held-to-maturity investment securities 1,133 745 Time deposits 465 (1) 389 Total short-term investments $ 3,424 $ 3,131 Long-term investments: Equity and cost method investments $ 75 $ 74 Held-to-maturity investment securities 18 161 Total long-term investments $ 93 $ 235 (1) Includes $405 million in restricted time deposits as of September 30, 2018. See Note 9 .
Available-for-sale Securities [Member]
Schedule of Investments [Line Items]
Unrealized Gain (Loss) on Investments	The amortized cost, gross unrealized gains and losses and fair value of available-for-sale investment securities at September 30, 2018 were as follows: Amortized Cost Unrealized Gains Unrealized Losses Fair (in millions) U.S. Treasury and agency debt securities $ 647 $ — $ (10 ) $ 637 Corporate and other debt securities 431 — (5 ) 426 Certificates of deposit and commercial paper 317 — — 317 Asset-backed securities 321 — (3 ) 318 Municipal debt securities 104 — (1 ) 103 Total available-for-sale investment securities $ 1,820 $ — $ (19 ) $ 1,801 The amortized cost, gross unrealized gains and losses and fair value of available-for-sale investment securities at December 31, 2017 were as follows: Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in millions) U.S. Treasury and agency debt securities $ 667 $ — $ (6 ) $ 661 Corporate and other debt securities 439 — (2 ) 437 Certificates of deposit and commercial paper 450 — — 450 Asset-backed securities 297 — (2 ) 295 Municipal debt securities 130 — (1 ) 129 Total available-for-sale investment securities $ 1,983 $ — $ (11 ) $ 1,972
Securities in Continuous Unrealized Loss Positions	The fair value and related unrealized losses of available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of September 30, 2018 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) U.S. Treasury and agency debt securities $ 296 $ (4 ) $ 336 $ (6 ) $ 632 $ (10 ) Corporate and other debt securities 258 (3 ) 134 (2 ) 392 (5 ) Certificates of deposit and commercial paper 198 — — — 198 — Asset-backed securities 168 (1 ) 137 (2 ) 305 (3 ) Municipal debt securities 62 (1 ) 40 — 102 (1 ) Total $ 982 $ (9 ) $ 647 $ (10 ) $ 1,629 $ (19 ) The fair value and related unrealized losses of available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31, 2017 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) U.S. Treasury and agency debt securities $ 519 $ (4 ) $ 124 $ (2 ) $ 643 $ (6 ) Corporate and other debt securities 297 (1 ) 126 (1 ) 423 (2 ) Certificates of deposit and commercial paper 49 — — — 49 — Asset-backed securities 193 (1 ) 94 (1 ) 287 (2 ) Municipal debt securities 107 (1 ) 18 — 125 (1 ) Total $ 1,165 $ (7 ) $ 362 $ (4 ) $ 1,527 $ (11 )
Contractual Maturities	The contractual maturities of our fixed income available-for-sale investment securities as of September 30, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 579 $ 578 Due after one year up to two years 474 466 Due after two years up to three years 407 400 Due after three years 39 39 Asset-backed securities 321 318 Total available-for-sale investment securities $ 1,820 $ 1,801
Schedule of Realized Gain (Loss)	Proceeds from sales of available-for-sale investment securities and the gross gains and losses that have been included in earnings as a result of those sales were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Proceeds from sales of available-for-sale investment securities $ 490 $ 375 $ 1,049 $ 2,020 Gross gains $ — $ — $ — $ 1 Gross losses (1 ) (1 ) (3 ) (2 ) Net realized (losses) on sales of available-for-sale investment securities $ (1 ) $ (1 ) $ (3 ) $ (1 )
Held-to-maturity Securities [Member]
Schedule of Investments [Line Items]
Unrealized Gain (Loss) on Investments	The amortized cost, gross unrealized gains and losses and fair value of held-to-maturity investment securities at September 30, 2018 were as follows: Amortized Unrealized Unrealized Fair (in millions) Short-term investments: Corporate and other debt securities $ 677 $ — $ (3 ) $ 674 Commercial paper 456 — (2 ) 454 Total short-term held-to-maturity investments 1,133 — (5 ) 1,128 Long-term investments: Corporate and other debt securities 6 — — 6 Commercial paper 12 — — 12 Total held-to-maturity investment securities $ 1,151 $ — $ (5 ) $ 1,146 The amortized cost, gross unrealized gains and losses and fair value of held-to-maturity investment securities at December 31, 2017 were as follows: Amortized Unrealized Unrealized Fair (in millions) Short-term investments: Corporate and other debt securities $ 346 $ — $ (1 ) $ 345 Commercial paper 399 — (2 ) 397 Total short-term held-to-maturity investments 745 — (3 ) 742 Long-term investments: Corporate and other debt securities 161 — (1 ) 160 Total held-to-maturity investment securities $ 906 $ — $ (4 ) $ 902
Securities in Continuous Unrealized Loss Positions	The fair value and related unrealized losses of held-to-maturity investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of September 30, 2018 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) Corporate and other debt securities $ 469 $ (2 ) $ 168 $ (1 ) $ 637 $ (3 ) Commercial paper 454 (2 ) — — 454 (2 ) Total $ 923 $ (4 ) $ 168 $ (1 ) $ 1,091 $ (5 ) The fair value and related unrealized losses of held-to-maturity investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31, 2017 : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses (in millions) Corporate and other debt securities $ 473 $ (2 ) $ — $ — $ 473 $ (2 ) Commercial paper 394 (2 ) — — 394 (2 ) Total $ 867 $ (4 ) $ — $ — $ 867 $ (4 )
Contractual Maturities	The contractual maturities of our fixed income held-to-maturity investment securities as of September 30, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 1,133 $ 1,128 Due after one year up to two years 12 12 Due after two years 6 6 Total held-to-maturity investment securities $ 1,151 $ 1,146

Accrued Expenses And Other Cu_2

Accrued Expenses And Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Payables and Accruals [Abstract]
Accrued Expenses And Other Current Liabilities	Accrued expenses and other current liabilities were as follows: September 30, 2018 December 31, 2017 (in millions) Compensation and benefits $ 1,053 $ 1,272 Customer volume and other incentives 320 289 Derivative financial instruments 67 5 FCPA Accrual 28 — Income taxes 158 48 Professional fees 114 100 Travel and entertainment 57 32 Other 329 325 Total accrued expenses and other current liabilities $ 2,126 $ 2,071

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Summary of Short-term Debt	The following summarizes our short-term debt balances as of: September 30, 2018 December 31, 2017 (in millions) Notes outstanding under revolving credit facility $ — $ 75 Term loan - current maturities 100 100 Total short-term debt $ 100 $ 175
Summary of Long-term Debt	The following summarizes our long-term debt balances as of: September 30, 2018 December 31, 2017 (in millions) Term loan, due November 2019 $ 725 $ 800 Less: Current maturities (100 ) (100 ) Deferred financing costs (1 ) (2 ) Long-term debt, net of current maturities $ 624 $ 698

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Schedule Of Effective Income Tax Rates	Our effective income tax rates were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Effective income tax rate 27.9 % 24.9 % 26.7 % 21.7 %

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Location And Fair Values Of Derivative Financial Instruments In Our Condensed Consolidated Statements Of Financial Position	The following table provides information on the location and fair values of derivative financial instruments included in our unaudited consolidated statements of financial position as of: September 30, 2018 December 31, 2017 Designation of Derivatives Location on Statements of Financial Position Assets Liabilities Assets Liabilities (in millions) Foreign exchange forward contracts – Designated as cash flow hedging instruments Other current assets $ 4 $ — $ 134 $ — Other noncurrent assets — — 20 — Accrued expenses and other current liabilities — 66 — — Other noncurrent liabilities — 48 — — Total 4 114 154 — Foreign exchange forward contracts – Not designated as hedging instruments Other current assets 3 — — — Accrued expenses and other current liabilities — 1 — 5 Total 3 1 — 5 Total $ 7 $ 115 $ 154 $ 5
Notional value of outstanding contracts by year of maturity	The notional value of our outstanding contracts by year of maturity and the net unrealized gains included in accumulated other comprehensive income (loss) for such contracts were as follows as of: September 30, 2018 December 31, 2017 (in millions) 2018 $ 360 $ 1,185 2019 1,215 720 2020 555 — Total notional value of contracts outstanding $ 2,130 $ 1,905 Net unrealized (losses) gains included in accumulated other comprehensive income (loss), net of taxes $ (90 ) $ 115
Location And Amounts Of Pre-Tax Gains (Losses) on Cash Flow Hedges	The following table provides information on the location and amounts of pre-tax gains and losses on our cash flow hedges for the three months ended September 30 : Change in Derivative Gains/Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion) Location of Net Derivative Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) 2018 2017 2018 2017 (in millions) Foreign exchange forward contracts – Designated as cash flow hedging instruments $ (96 ) $ 6 Cost of revenues $ 6 $ 29 Selling, general and administrative expenses 1 5 Total $ 7 $ 34 The following table provides information on the location and amounts of pre-tax gains and losses on our cash flow hedges for the nine months ended September 30 : Change in Derivative Gains/Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion) Location of Net Derivative Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion) 2018 2017 2018 2017 (in millions) Foreign exchange forward contracts – Designated as cash flow hedging instruments $ (201 ) $ 165 Cost of revenues $ 54 $ 75 Selling, general and administrative expenses 9 14 Total $ 63 $ 89
Additional Information Related To Outstanding Contracts Not Designated As Hedging Instruments	Additional information related to our outstanding foreign exchange forward contracts not designated as hedging instruments is as follows: September 30, 2018 December 31, 2017 Notional Fair Value Notional Fair Value (in millions) Contracts outstanding $ 460 $ 2 $ 255 $ (5 )
Location And Amounts Of Pre-Tax Gains (Losses) On Derivative Financial Instruments Not Designated As Hedges	The following table provides information on the location and amounts of realized and unrealized pre-tax gains and losses on our other derivative financial instruments for the three and nine months ended September 30 : Location of Net Gains (Losses) on Derivative Instruments Amount of Net Gains (Losses) on Derivative Instruments Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Foreign exchange forward contracts – Not designated as hedging instruments Foreign currency exchange gains (losses), net $ 3 $ (3 ) $ 23 $ (16 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis	The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of September 30, 2018 : Level 1 Level 2 Level 3 Total (in millions) Cash equivalents: Money market funds $ 401 $ — $ — $ 401 Commercial paper and bank deposits — 6 — 6 Total cash equivalents 401 6 — 407 Short-term investments: Time deposits (1) — 465 — 465 Available-for-sale investment securities: U.S. Treasury and agency debt securities 572 65 — 637 Corporate and other debt securities — 426 — 426 Certificates of deposit and commercial paper — 317 — 317 Asset-backed securities — 318 — 318 Municipal debt securities — 103 — 103 Total available-for-sale investment securities 572 1,229 — 1,801 Held-to-maturity investment securities: Corporate and other debt securities — 674 — 674 Commercial paper — 454 — 454 Total short-term held-to-maturity investment securities — 1,128 — 1,128 Total short-term investments (2) 572 2,822 — 3,394 Long-term investments: Held-to-maturity investment securities: Corporate and other debt securities — 6 — 6 Commercial paper — 12 — 12 Total long-term held-to-maturity investment securities — 18 — 18 Total long-term investments (3) — 18 — 18 Derivative financial instruments - foreign exchange forward contracts: Other current assets — 7 — 7 Accrued expenses and other current liabilities — (67 ) — (67 ) Other noncurrent liabilities — (48 ) — (48 ) Total $ 973 $ 2,738 $ — $ 3,711 (1) Includes $405 million in restricted time deposits. See Note 9 . (2) Excludes an equity security invested in a mutual fund valued at $25 million based on the NAV of the fund. (3) Excludes equity and cost method investments of $75 million , which are accounted for using the equity method of accounting and at cost, respectively. The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of December 31, 2017 : Level 1 Level 2 Level 3 Total (in millions) Cash equivalents: Money market funds $ 334 $ — $ — $ 334 Bank deposits — 80 — 80 Commercial paper — 386 — 386 Total cash equivalents 334 466 — 800 Short-term investments: Time deposits — 389 — 389 Available-for-sale investment securities: U.S. Treasury and agency debt securities 585 76 — 661 Corporate and other debt securities — 437 — 437 Certificates of deposit and commercial paper — 450 — 450 Asset-backed securities — 295 — 295 Municipal debt securities — 129 — 129 Total available-for-sale investment securities 585 1,387 — 1,972 Held-to-maturity investment securities: Corporate and other debt securities — 345 — 345 Commercial paper — 397 — 397 Total held-to-maturity investment securities — 742 — 742 Total short-term investments (1) 585 2,518 — 3,103 Long-term investments: Held-to-maturity investment securities: Corporate and other debt securities — 160 — 160 Total held-to-maturity investment securities — 160 — 160 Total long-term investments (2) — 160 — 160 Derivative financial instruments - foreign exchange forward contracts: Other current assets — 134 — 134 Accrued expenses and other current liabilities — (5 ) — (5 ) Other noncurrent assets — 20 — 20 Total $ 919 $ 3,293 $ — $ 4,212 (1) Excludes an equity security invested in a mutual fund valued at $25 million based on the NAV of the fund. (2) Excludes equity and cost method investments of $74 million , which are accounted for using the equity method of accounting and at cost, respectively.

Stockholder's Equity (Tables)

Stockholder's Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Accelerated Share Repurchases	The ASR activity and related information during the nine months ended September 30, 2018 and the year ended December 31, 2017 were as follows: Purchase Period End Date Number of Shares Average Repurchase Price per Share ASR Amount (in millions) (in millions) June 2018 ASR August 2018 7.6 (1) $ 79.42 $ 600 March 2018 ASR May 2018 3.7 (2) $ 79.95 $ 300 December 2017 ASR March 2018 4.0 (3) $ 75.75 $ 300 March 2017 ASR August 2017 23.7 $ 63.19 $ 1,500 ___________________ (1) Includes 6.5 million shares initially delivered in June 2018 and 1.1 million shares delivered in August 2018 upon the final settlement of the ASR. (2) Includes 3.0 million shares initially delivered in March 2018 and 0.7 million shares delivered in May 2018 upon the final settlement of the ASR. (3) Includes 3.6 million shares initially delivered in December 2017 and 0.4 million shares delivered in March 2018 upon the final settlement of the ASR.
Dividends Declared	Dividends on our Class A common stock, including dividend equivalents, during the periods presented were as follows: Dividends per Share Amount (in millions) 2018: Three months ended March 31, 2018 $ 0.20 $ 119 Three months ended June 30, 2018 0.20 119 Three months ended September 30, 2018 0.20 117 Nine months ended September 30, 2018 $ 355 2017: Three months ended June 30, 2017 $ 0.15 $ 89 Three months ended September 30, 2017 0.15 90 Three months ended December 31, 2017 0.15 89 Year ended December 31, 2017 $ 268
Schedule of Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) by component were as follows for the three and nine months ended September 30, 2018 : Three Months Nine Months Before Tax Amount Tax Effect Net of Tax Amount Before Tax Tax Net of Tax (in millions) Foreign currency translation adjustments: Beginning balance $ (79 ) $ 7 $ (72 ) $ (38 ) $ — $ (38 ) Change in foreign currency translation adjustments (14 ) 2 (12 ) (55 ) 9 (46 ) Ending balance $ (93 ) $ 9 $ (84 ) $ (93 ) $ 9 $ (84 ) Unrealized (losses) on available-for-sale investment securities: Beginning balance $ (19 ) $ 5 $ (14 ) $ (11 ) $ 4 $ (7 ) Cumulative effect of change in accounting principle (1) — — — — (1 ) (1 ) Net unrealized (losses) arising during the period (1 ) — (1 ) (11 ) 2 (9 ) Reclassification of net losses to Other, net 1 — 1 3 — 3 Net change — — — (8 ) 1 (7 ) Ending balance $ (19 ) $ 5 $ (14 ) $ (19 ) $ 5 $ (14 ) Unrealized gains on cash flow hedges: Beginning balance $ (7 ) $ (1 ) $ (8 ) $ 154 $ (39 ) $ 115 Unrealized (losses) arising during the period (96 ) 20 (76 ) (201 ) 44 (157 ) Reclassifications of net (gains) to: Cost of revenues (6 ) 1 (5 ) (54 ) 13 (41 ) Selling, general and administrative expenses (1 ) — (1 ) (9 ) 2 (7 ) Net change (103 ) 21 (82 ) (264 ) 59 (205 ) Ending balance $ (110 ) $ 20 $ (90 ) $ (110 ) $ 20 $ (90 ) Accumulated other comprehensive income (loss): Beginning balance $ (105 ) $ 11 $ (94 ) $ 105 $ (35 ) $ 70 Other comprehensive income (loss) (117 ) 23 (94 ) (327 ) 69 (258 ) Ending balance $ (222 ) $ 34 $ (188 ) $ (222 ) $ 34 $ (188 ) (1) Reflects the adoption of accounting standards as described in Note 1 . Changes in accumulated other comprehensive income (loss) by component were as follows for the three and nine months ended September 30, 2017 : Three Months Nine Months Before Tax Amount Tax Effect Net of Tax Amount Before Tax Tax Net of Tax (in millions) Foreign currency translation adjustments: Beginning balance $ (82 ) $ — $ (82 ) $ (149 ) $ — $ (149 ) Change in foreign currency translation adjustments 33 — 33 100 — 100 Ending balance $ (49 ) $ — $ (49 ) $ (49 ) $ — $ (49 ) Unrealized gains (losses) on available-for-sale investment securities: Beginning balance $ (3 ) $ 1 $ (2 ) $ (6 ) $ 2 $ (4 ) Net unrealized (losses) gains arising during the period (1 ) — (1 ) 2 (1 ) 1 Reclassification of net losses to Other, net 1 — 1 1 — 1 Net change — — — 3 (1 ) 2 Ending balance $ (3 ) $ 1 $ (2 ) $ (3 ) $ 1 $ (2 ) Unrealized gains on cash flow hedges: Beginning balance $ 155 $ (38 ) $ 117 $ 51 $ (12 ) $ 39 Unrealized gains arising during the period 6 (2 ) 4 165 (41 ) 124 Reclassifications of net (gains) to: Cost of revenues (29 ) 7 (22 ) (75 ) 18 (57 ) Selling, general and administrative expenses (5 ) 1 (4 ) (14 ) 3 (11 ) Net change (28 ) 6 (22 ) 76 (20 ) 56 Ending balance $ 127 $ (32 ) $ 95 $ 127 $ (32 ) $ 95 Accumulated other comprehensive income (loss): Beginning balance $ 70 $ (37 ) $ 33 $ (104 ) $ (10 ) $ (114 ) Other comprehensive income (loss) 5 6 11 179 (21 ) 158 Ending balance $ 75 $ (31 ) $ 44 $ 75 $ (31 ) $ 44

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Revenues From External Customers And Segment Operating Profit	Revenues from external customers and segment operating profits, before unallocated expenses, by reportable segment were as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Revenues: Financial Services $ 1,464 $ 1,427 $ 4,394 $ 4,209 Healthcare 1,189 1,085 3,466 3,138 Products and Resources 863 774 2,524 2,258 Communications, Media and Technology 562 480 1,612 1,377 Total revenues $ 4,078 $ 3,766 $ 11,996 $ 10,982 Segment Operating Profit: Financial Services $ 446 $ 476 $ 1,355 $ 1,348 Healthcare 382 352 1,077 971 Products and Resources 267 248 781 695 Communications, Media and Technology 184 159 522 450 Total segment operating profit 1,279 1,235 3,735 3,464 Less: unallocated costs 534 587 1,627 1,640 Income from operations $ 745 $ 648 $ 2,108 $ 1,824
Revenues And Long-Lived Assets By Geographic Area	Revenue and long-lived assets, by geographic area, are as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 (in millions) Revenues: (1) North America (2) $ 3,107 $ 2,891 $ 9,149 $ 8,503 United Kingdom 325 301 944 863 Rest of Europe 398 327 1,153 903 Europe - Total 723 628 2,097 1,766 Rest of World (3) 248 247 750 713 Total revenues $ 4,078 $ 3,766 $ 11,996 $ 10,982 As of September 30, 2018 December 31, 2017 (in millions) Long-lived Assets: (4) North America (2) $ 420 $ 360 Europe 90 63 Rest of World (3)(5) 852 901 Total $ 1,362 $ 1,324 ________________ (1) Revenues are attributed to regions based upon customer location. (2) Substantially all relates to operations in the United States. (3) Includes our operations in Asia Pacific, the Middle East and Latin America. (4) Long-lived assets include property and equipment, net of accumulated depreciation and amortization. (5) Substantially all of these long-lived assets relate to our operations in India.

Interim Consolidated Financia_3

Interim Consolidated Financial Statements (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (121)
Operating Leases, Future Minimum Payments Due		$ 943
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	(122)
Retained Earnings [Member] | Adjustments for New Accounting Principle, Early Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	(1)
Accumulated other comprehensive income (loss):
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	1
Accumulated other comprehensive income (loss): | Adjustments for New Accounting Principle, Early Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 1

Internal Investigation and Re_2

Internal Investigation and Related Matters (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2017
Loss Contingencies [Line Items]
Selling, general and administrative expenses	$ 734	$ 674	$ 2,250	$ 2,069
Loss contingency accrual						$ 0
Out of period adjustment [Member] | Internal Investigation and Related Matters [Member]
Loss Contingencies [Line Items]
Selling, general and administrative expenses					$ 4
FCPA Accrual [Member]
Loss Contingencies [Line Items]
Loss contingency accrual	$ 28		$ 28

Revenues - Narrative (Details)

Revenues - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect	$ 121
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect	122
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax impact	37
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect	$ 121

Revenues - Schedule of Effect o

Revenues - Schedule of Effect of New Accounting Pronouncements on Affected Financial Position Line Items (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Assets:
Trade accounts receivable, net	$ 3,187	$ 2,865
Unbilled accounts receivable	0	357
Other current assets	777	833
Total current assets	8,727	9,111
Other noncurrent assets	643	448
Total assets	15,274	15,221
Liabilities:
Deferred revenue	244	383
Total current liabilities	2,693	2,839
Deferred revenue, noncurrent	72	104
Deferred income tax liabilities, net	157	146
Total liabilities	4,296	4,552
Stockholders’ equity:
Retained earnings	11,041	10,544
Total stockholders’ equity	10,978	10,669	$ 10,979	$ 10,728
Total liabilities and stockholders’ equity	15,274	$ 15,221
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets:
Trade accounts receivable, net	3,073
Unbilled accounts receivable	432
Other current assets	457
Other noncurrent assets	589
Liabilities:
Deferred revenue	417
Deferred revenue, noncurrent	106
Deferred income tax liabilities, net	100
Stockholders’ equity:
Retained earnings	10,835
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets:
Trade accounts receivable, net	114
Unbilled accounts receivable	(432)
Other current assets	320
Total current assets	2
Other noncurrent assets	54
Total assets	56
Liabilities:
Deferred revenue	(173)
Total current liabilities	(173)
Deferred revenue, noncurrent	(34)
Deferred income tax liabilities, net	57
Total liabilities	(150)
Stockholders’ equity:
Retained earnings	206
Total stockholders’ equity	206
Total liabilities and stockholders’ equity	$ 56

Revenues - Schedule of Effect_2

Revenues - Schedule of Effect of New Accounting Pronouncements on Affected Statement of Operations Line Items (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 4,078	$ 3,766	$ 11,996	$ 10,982
Cost of revenues	2,480	2,337	7,298	6,792
Selling, general and administrative expenses	734	674	2,250	2,069
Depreciation and amortization expense	119	107	340	297
Income from operations	745	648	2,108	1,824
Other income (expense), net	(83)	10	(126)	118
Income before provision for income taxes	662	658	1,982	1,942
Provision for income taxes	(185)	(164)	(530)	(421)
Income from equity method investments	0	1	1	1
Net income	$ 477	$ 495	$ 1,453	$ 1,522
Basic earnings per share (usd per share)	$ 0.82	$ 0.84	$ 2.49	$ 2.56
Diluted earnings per share (usd per share)	$ 0.82	$ 0.84	$ 2.48	$ 2.55
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 4,045		$ 11,911
Cost of revenues	2,484		7,317
Selling, general and administrative expenses	734		2,250
Depreciation and amortization expense	119		340
Income from operations	708		2,004
Other income (expense), net	(84)		(127)
Income before provision for income taxes	624		1,877
Provision for income taxes	(178)		(510)
Income from equity method investments	0		1
Net income	$ 446		$ 1,368
Basic earnings per share (usd per share)	$ 0.77		$ 2.34
Diluted earnings per share (usd per share)	$ 0.77		$ 2.34
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 33		$ 85
Cost of revenues	(4)		(19)
Selling, general and administrative expenses	0		0
Depreciation and amortization expense	0		0
Income from operations	37		104
Other income (expense), net	1		1
Income before provision for income taxes	38		105
Provision for income taxes	(7)		(20)
Income from equity method investments	0		0
Net income	$ 31		$ 85
Basic earnings per share (usd per share)	$ 0.05		$ 0.15
Diluted earnings per share (usd per share)	$ 0.05		$ 0.14

Revenues - Capitalized Costs to

Revenues - Capitalized Costs to Fulfill Contract with Customer (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Balance - January 1, 2018	$ 303
Amortization expense	(50)
Costs capitalized	132
Other	(2)
Balance - September 30, 2018	$ 383

Revenues - Significant Movement

Revenues - Significant Movements in Contract Assets (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Balance - January 1, 2018	$ 306
Revenues recognized during the period but not billed	290
Amounts reclassified to accounts receivable	(273)
Other	(3)
Balance - September 30, 2018	$ 320

Revenues - Significant Moveme_2

Revenues - Significant Movements in Deferred Revenue Balances (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Balance - January 1, 2018	$ 431
Amounts billed but not recognized as revenues	116
Revenues recognized related to the opening balance of deferred revenue	(230)
Other	(1)
Balance - September 30, 2018	$ 316

Revenues - Remaining Performanc

Revenues - Remaining Performance Obligations Narrative (Details) $ in Millions	3 Months Ended
	Sep. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 2,014
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	70.00%
Revenue, remaining performance obligation, period	2 years

Revenues - Disaggregation of Re

Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 4,078	$ 11,996
Time-and-materials [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,146	6,323
Fixed-price [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,484	4,455
Transaction or volume-based [Member]
Disaggregation of Revenue [Line Items]
Revenue	448	1,218
North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,107	9,149
United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	325	944
Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	398	1,153
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	723	2,097
Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	248	750
Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,351	6,905
Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,727	5,091
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,464	4,394
Financial Services [Member] | Time-and-materials [Member]
Disaggregation of Revenue [Line Items]
Revenue	954	2,842
Financial Services [Member] | Fixed-price [Member]
Disaggregation of Revenue [Line Items]
Revenue	453	1,384
Financial Services [Member] | Transaction or volume-based [Member]
Disaggregation of Revenue [Line Items]
Revenue	57	168
Financial Services [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,033	3,133
Financial Services [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	127	357
Financial Services [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	170	497
Financial Services [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	297	854
Financial Services [Member] | Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	134	407
Financial Services [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	902	2,658
Financial Services [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	562	1,736
Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,189	3,466
Healthcare [Member] | Time-and-materials [Member]
Disaggregation of Revenue [Line Items]
Revenue	464	1,364
Healthcare [Member] | Fixed-price [Member]
Disaggregation of Revenue [Line Items]
Revenue	452	1,406
Healthcare [Member] | Transaction or volume-based [Member]
Disaggregation of Revenue [Line Items]
Revenue	273	696
Healthcare [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,084	3,167
Healthcare [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	23	68
Healthcare [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	69	191
Healthcare [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	92	259
Healthcare [Member] | Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	13	40
Healthcare [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	645	1,896
Healthcare [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	544	1,570
Products and Resources [Member]
Disaggregation of Revenue [Line Items]
Revenue	863	2,524
Products and Resources [Member] | Time-and-materials [Member]
Disaggregation of Revenue [Line Items]
Revenue	374	1,122
Products and Resources [Member] | Fixed-price [Member]
Disaggregation of Revenue [Line Items]
Revenue	392	1,120
Products and Resources [Member] | Transaction or volume-based [Member]
Disaggregation of Revenue [Line Items]
Revenue	97	282
Products and Resources [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	609	1,766
Products and Resources [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	90	266
Products and Resources [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	109	327
Products and Resources [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	199	593
Products and Resources [Member] | Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	55	165
Products and Resources [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	512	1,492
Products and Resources [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	351	1,032
Communication, Media and Technology [Member]
Disaggregation of Revenue [Line Items]
Revenue	562	1,612
Communication, Media and Technology [Member] | Time-and-materials [Member]
Disaggregation of Revenue [Line Items]
Revenue	354	995
Communication, Media and Technology [Member] | Fixed-price [Member]
Disaggregation of Revenue [Line Items]
Revenue	187	545
Communication, Media and Technology [Member] | Transaction or volume-based [Member]
Disaggregation of Revenue [Line Items]
Revenue	21	72
Communication, Media and Technology [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	381	1,083
Communication, Media and Technology [Member] | United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	85	253
Communication, Media and Technology [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	50	138
Communication, Media and Technology [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	135	391
Communication, Media and Technology [Member] | Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenue	46	138
Communication, Media and Technology [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	292	859
Communication, Media and Technology [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 270	$ 753

Business Combinations Narrative

Business Combinations Narrative (Details) - Series of Individually Immaterial Business Acquisitions [Member] $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)business
Business Acquisition [Line Items]
Number of businesses acquired | business	2
Consideration transferred | $	$ 492

Business Combinations Allocatio

Business Combinations Allocation of Purchase Price (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 3,037	$ 2,704
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash	9
Current assets	37
Property, plant and equipment and other noncurrent assets	7
Goodwill	344
Current liabilities	14
Noncurrent liabilities	39
Purchase price	492
Customer Relationships [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 122
Weighted Average Useful Life	9 years 8 months
Other Intangible Assets [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 26
Weighted Average Useful Life	2 years 5 months

Realignment Charges (Details)

Realignment Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Realignment Charges	$ 11	$ 19	$ 12	$ 69
Employee separations [Member]
Restructuring Cost and Reserve [Line Items]
Realignment Charges	11	14	11	53
Advisory fees [Member]
Restructuring Cost and Reserve [Line Items]
Realignment Charges	0	5	0	15
Lease termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Realignment Charges	$ 0	$ 0	$ 1	$ 1

Investments (Details)

Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Short-term investments:
Equity investment securities	$ 25		$ 25		$ 25
Available-for-sale investment securities	1,801		1,801		1,972
Held-to-maturity investment securities	1,133		1,133		745
Time deposits	465		465		389
Total short-term investments	3,424		3,424		3,131
Long-term investments:
Equity and cost method investments	75		75		74
Held-to-maturity investment securities	18		18		161
Total long-term investments	93		93		$ 235
Restricted investments	405		405
Trading securities, realized gain (loss)	$ 0	$ 0	$ 0	$ 0

Investments (Amortized Cost, Gr

Investments (Amortized Cost, Gross Unrealized Gains And Losses And Fair Value Of Investment Securities Available-For-Sale) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,820	$ 1,983
Unrealized Gains	0	0
Unrealized Losses	(19)	(11)
Available-for-sale securities, current	1,801	1,972
U.S. Treasury And Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	647	667
Unrealized Gains	0	0
Unrealized Losses	(10)	(6)
Available-for-sale securities, current	637	661
Corporate And Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	431	439
Unrealized Gains	0	0
Unrealized Losses	(5)	(2)
Available-for-sale securities, current	426	437
Certificates of Deposit and Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	317	450
Unrealized Gains	0	0
Unrealized Losses	0	0
Available-for-sale securities, current	317	450
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	321	297
Unrealized Gains	0	0
Unrealized Losses	(3)	(2)
Available-for-sale securities, current	318	295
Municipal Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	104	130
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Available-for-sale securities, current	$ 103	$ 129

Investments (Securities In A Co

Investments (Securities In A Continuous Unrealized Loss Position) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	$ 982	$ 1,165
Unrealized losses, available-for-sale securities, Less than 12 Months	(9)	(7)
Fair value available-for-sale securities 12 Months or More	647	362
Unrealized losses, available-for-sale securities, 12 Months or More	(10)	(4)
Total Fair Value available-for-sale securities	1,629	1,527
Unrealized losses, available-for-sale securities, Total	(19)	(11)
U.S. Treasury And Agency Debt Securities [Member]
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	296	519
Unrealized losses, available-for-sale securities, Less than 12 Months	(4)	(4)
Fair value available-for-sale securities 12 Months or More	336	124
Unrealized losses, available-for-sale securities, 12 Months or More	(6)	(2)
Total Fair Value available-for-sale securities	632	643
Unrealized losses, available-for-sale securities, Total	(10)	(6)
Corporate And Other Debt Securities [Member]
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	258	297
Unrealized losses, available-for-sale securities, Less than 12 Months	(3)	(1)
Fair value available-for-sale securities 12 Months or More	134	126
Unrealized losses, available-for-sale securities, 12 Months or More	(2)	(1)
Total Fair Value available-for-sale securities	392	423
Unrealized losses, available-for-sale securities, Total	(5)	(2)
Certificates of Deposit and Commercial Paper [Member]
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	198	49
Unrealized losses, available-for-sale securities, Less than 12 Months	0	0
Fair value available-for-sale securities 12 Months or More	0	0
Unrealized losses, available-for-sale securities, 12 Months or More	0	0
Total Fair Value available-for-sale securities	198	49
Unrealized losses, available-for-sale securities, Total	0	0
Asset-Backed Securities [Member]
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	168	193
Unrealized losses, available-for-sale securities, Less than 12 Months	(1)	(1)
Fair value available-for-sale securities 12 Months or More	137	94
Unrealized losses, available-for-sale securities, 12 Months or More	(2)	(1)
Total Fair Value available-for-sale securities	305	287
Unrealized losses, available-for-sale securities, Total	(3)	(2)
Municipal Debt Securities [Member]
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	62	107
Unrealized losses, available-for-sale securities, Less than 12 Months	(1)	(1)
Fair value available-for-sale securities 12 Months or More	40	18
Unrealized losses, available-for-sale securities, 12 Months or More	0	0
Total Fair Value available-for-sale securities	102	125
Unrealized losses, available-for-sale securities, Total	$ (1)	$ (1)

Investments (Contractual Maturi

Investments (Contractual Maturities Of Investments In Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost
Due within one year, available-for-sale	$ 579
Due within one year, held-to-maturity	1,133
Due after one year up to two years, available-for-sale	474
Due after one year up to two years, held-to-maturity	12
Due after two years up to three years, available-for-sale	407
Due after two years up to three years, held-to-maturity	6
Due after three years, available-for-sale	39
Asset-backed securities	321
Amortized Cost, available-for-sale	1,820
Amortized Cost, held-to-maturity	1,151	$ 906
Fair Value
Due within one year, available-for-sale	578
Due within one year, held-to-maturity	1,128
Due after one year up to two years, available-for-sale	466
Due after one year up to two years, available-for-sale	12
Due after two years up to three years, available-for-sale	400
Due after two years up to three years, held-to-maturity	6
Due after three years	39
Asset-backed securities	318
Fair Value, available-for-sale	1,801
Fair Value, held-to-maturity	$ 1,146	$ 902

Investments (Gross Gains (Losse

Investments (Gross Gains (Losses) Realized On Sales, Maturities And Other Securities Transactions Related To Investment Securities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments [Abstract]
Proceeds from sales of available-for-sale investment securities	$ 490	$ 375	$ 1,049	$ 2,020
Gross gains	0	0	0	1
Gross losses	(1)	(1)	(3)	(2)
Net realized gains on sales of available-for-sale investment securities	$ (1)	$ (1)	$ (3)	$ (1)

Investments (Schedule of Held-t

Investments (Schedule of Held-to-Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 1,133	$ 745
Amortized Cost, Noncurrent	18	161
Unrealized Gains	0	0
Unrealized Losses	(5)	(4)
Fair Value	1,146	902
Amortized Cost, held-to-maturity	1,151	906
Less than 12 Months, Fair Value	923	867
Less than 12 Months, Unrealized Losses	(4)	(4)
12 Months or More, Fair Value	168	0
12 Months or More, Unrealized Losses	(1)	0
Fair Value	1,091	867
Unrealized Losses	(5)	(4)
Corporate And Other Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 Months, Fair Value	469	473
Less than 12 Months, Unrealized Losses	(2)	(2)
12 Months or More, Fair Value	168	0
12 Months or More, Unrealized Losses	(1)	0
Fair Value	637	473
Unrealized Losses	(3)	(2)
Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 Months, Fair Value	454	394
Less than 12 Months, Unrealized Losses	(2)	(2)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Fair Value	454	394
Unrealized Losses	(2)	(2)
Short-term Investments [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	1,133	745
Unrealized Gains	0	0
Unrealized Losses	(5)	(3)
Fair Value	1,128	742
Short-term Investments [Member] | Corporate And Other Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	677	346
Unrealized Gains	0	0
Unrealized Losses	(3)	(1)
Fair Value	674	345
Short-term Investments [Member] | Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	456	399
Unrealized Gains	0	0
Unrealized Losses	(2)	(2)
Fair Value	454	397
Long-term investments [Member] | Corporate And Other Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Noncurrent	6	161
Unrealized Gains	0	0
Unrealized Losses	0	(1)
Fair Value	6	$ 160
Long-term investments [Member] | Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Noncurrent	12
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 12

Accrued Expenses And Other Cu_3

Accrued Expenses And Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Compensation and benefits	$ 1,053	$ 1,272
Customer volume and other incentives	320	289
Derivative financial instruments	67	5
FCPA Accrual		0
Income taxes	158	48
Professional fees	114	100
Travel and entertainment	57	32
Other	329	325
Total accrued expenses and other current liabilities	2,126	$ 2,071
FCPA Accrual [Member]
Loss Contingencies [Line Items]
FCPA Accrual	$ 28

Debt (Additional Disclosures) (

Debt (Additional Disclosures) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2014
Term Loan [Member]
Line of Credit Facility [Line Items]
Principal amount of debt		$ 1,000
Final payment amount		625
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 750
Period drawn notes have been outstanding	90 days

Debt (Short-term Debt) (Details

Debt (Short-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Total short-term debt	$ 100	$ 175
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Notes outstanding under revolving credit facility	0	75
Term Loan [Member]
Short-term Debt [Line Items]
Term loan - current maturities	$ 100	$ 100

Debt (Long-term Debt) (Details)

Debt (Long-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, net of current maturities	$ 624	$ 698
Term Loan [Member]
Debt Instrument [Line Items]
Term loan, due November 2019	725	800
Current maturities	(100)	(100)
Deferred financing costs	(1)	(2)
Long-term debt, net of current maturities	$ 624	$ 698

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)		$ 617
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense		635
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Foreign and U.S. State Tax Applicable Upon Repatriation of the Accumulated Undistributed Foreign Earnings, Provisional Income Tax Expense		53
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit		$ 71
Tax Cuts and Jobs Act of 2017, Measurement Period Adjustment, Income Tax Expense (Benefit)	$ (5)
Previously unrecognized income tax benefits			$ 72
Tax Cuts and Jobs Act of 2017, Provisional Income Tax Expense (Benefit)	$ 612

Income Taxes (Schedule Of Effec

Income Taxes (Schedule Of Effective Tax Rate) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	27.90%	24.90%	26.70%	21.70%

Income Taxes (Narrative) (One-t

Income Taxes (Narrative) (One-time Transaction) (Details) $ in Millions, ₨ in Billions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2013USD ($)	Sep. 30, 2018INR (₨)	Apr. 30, 2018INR (₨)	Dec. 31, 2017USD ($)
One-time Transaction [Table] [Line Items]
Income tax expense		$ 185	$ 164	$ 530	$ 421
Restricted investments		405		405
Indian Income Tax Department (ITD) [Member] | Foreign tax authority [Member]
One-time Transaction [Table] [Line Items]
Deposits assets		$ 68		$ 68				₨ 5
Desposits assets, percent disputed tax amount		15.00%		15.00%				15.00%
Restricted investments initially deposited		$ 387		$ 387
Restricted investments		405		405					₨ 28	$ 0
Indian Income Tax Department (ITD) [Member] | Foreign tax authority [Member] | 2016 India Cash Remittance [Member]
One-time Transaction [Table] [Line Items]
Foreign earnings repatriated	$ 2,800
Income tax expense						$ 135
Income tax, disputed amount		$ 455		$ 455				₨ 33
Indian Income Tax Department (ITD) [Member] | Foreign tax authority [Member] | 2013 India Share Repurchase [Member]
One-time Transaction [Table] [Line Items]
Foreign earnings repatriated							$ 523

Derivative Financial Instrume_3

Derivative Financial Instruments (Location And Fair Values Of Derivative Financial Instruments In Our Consolidated Statement Of Financial Position) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets fair value	$ 7	$ 154
Derivative liabilities fair value	115	5
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	4	154
Derivative liabilities fair value	114	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	4	134
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	0	20
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	66	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	48	0
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	3	0
Derivative liabilities fair value	1	5
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	3	0
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	$ 1	$ 5

Derivative Financial Instrume_4

Derivative Financial Instruments (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash flow hedge gains (losses) expected to be reclassified to earnings within the next 12 months	$ (50)
Cash flow hedge ineffectiveness is immaterial	Hedge ineffectiveness was immaterial for all periods presented.

Derivative Financial Instrume_5

Derivative Financial Instruments (Notional Value Of Outstanding Cash Flow Hedge Contracts By Year Of Maturity And Net Unrealized (Loss) Gain Included In Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Foreign Exchange Forward [Member]
Derivative [Line Items]
Net unrealized (losses) gains included in accumulated other comprehensive income (loss), net of taxes	$ (90)	$ 115
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	2,130	1,905
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2018 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	360	1,185
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2019 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	1,215	720
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2020 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	$ 555	$ 0

Derivative Financial Instrume_6

Derivative Financial Instruments (Location And Amounts Of Pre-Tax Gains (Losses) On Cash Flow Hedge Derivatives Financial Instruments) (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	$ 7	$ 34	$ 63	$ 89
Cost Of Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	6	29	54	75
Selling, General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	1	5	9	14
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Derivative Gains/Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion)	$ (96)	$ 6	$ (201)	$ 165

Derivative Financial Instrume_7

Derivative Financial Instruments (Other Derivatives) (Details) - Not Designated as Hedging Instrument [Member] - Foreign Exchange Forward [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional	$ 460	$ 255
Market Value	$ 2	$ (5)

Derivative Financial Instrume_8

Derivative Financial Instruments (Location And Amounts Of Pre-Tax Gains (Losses) On Derivative Financial Instruments Not Designated As Hedges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Foreign Currency Exchange Gains (Losses), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of net gains (losses) on derivative instruments	$ 3	$ (3)	$ 23	$ (16)

Fair Value Measurements (Financ

Fair Value Measurements (Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 1,146	$ 902
Restricted investments	405
Trading securities	25	25
Equity and Cost Method Investments	75	74
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	407	800
Time deposits	465	389
Available-for-sale investment securities	1,801	1,972
Total	3,711	4,212
Recurring [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	7	134
Recurring [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	(67)	(5)
Recurring [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets		20
Recurring [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	(48)
Recurring [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	637	661
Recurring [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	426	437
Recurring [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	317	450
Recurring [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	318	295
Recurring [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	103	129
Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	401	334
Recurring [Member] | Bank Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		80
Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		386
Recurring [Member] | Commercial paper and bank deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	6
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	401	334
Time deposits	0	0
Available-for-sale investment securities	572	585
Total	973	919
Recurring [Member] | Level 1 [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0	0
Recurring [Member] | Level 1 [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0	0
Recurring [Member] | Level 1 [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets		0
Recurring [Member] | Level 1 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0
Recurring [Member] | Level 1 [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	572	585
Recurring [Member] | Level 1 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	401	334
Recurring [Member] | Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Recurring [Member] | Level 1 [Member] | Commercial paper and bank deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	6	466
Time deposits	465	389
Available-for-sale investment securities	1,229	1,387
Total	2,738	3,293
Recurring [Member] | Level 2 [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	7	134
Recurring [Member] | Level 2 [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	(67)	(5)
Recurring [Member] | Level 2 [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets		20
Recurring [Member] | Level 2 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	(48)
Recurring [Member] | Level 2 [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	65	76
Recurring [Member] | Level 2 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	426	437
Recurring [Member] | Level 2 [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	317	450
Recurring [Member] | Level 2 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	318	295
Recurring [Member] | Level 2 [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	103	129
Recurring [Member] | Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Recurring [Member] | Level 2 [Member] | Bank Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		80
Recurring [Member] | Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		386
Recurring [Member] | Level 2 [Member] | Commercial paper and bank deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	6
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Time deposits	0	0
Available-for-sale investment securities	0	0
Total	0	0
Recurring [Member] | Level 3 [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0	0
Recurring [Member] | Level 3 [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0	0
Recurring [Member] | Level 3 [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets		0
Recurring [Member] | Level 3 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0
Recurring [Member] | Level 3 [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0
Recurring [Member] | Level 3 [Member] | Certificates of Deposit and Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Recurring [Member] | Level 3 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Recurring [Member] | Level 3 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Recurring [Member] | Level 3 [Member] | Commercial paper and bank deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	1,128	742
Short-term Investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	454	397
Short-term Investments [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	674	345
Short-term Investments [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	1,128	742
Investments	3,394	3,103
Short-term Investments [Member] | Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	454	397
Short-term Investments [Member] | Recurring [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	674	345
Short-term Investments [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Investments	572	585
Short-term Investments [Member] | Recurring [Member] | Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Short-term Investments [Member] | Recurring [Member] | Level 1 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Short-term Investments [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	1,128	742
Investments	2,822	2,518
Short-term Investments [Member] | Recurring [Member] | Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	454	397
Short-term Investments [Member] | Recurring [Member] | Level 2 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	674	345
Short-term Investments [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Investments	0	0
Short-term Investments [Member] | Recurring [Member] | Level 3 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Short-term Investments [Member] | Recurring [Member] | Level 3 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Long-term investments [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	12
Long-term investments [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	6	160
Long-term investments [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	18	160
Investments	18	160
Long-term investments [Member] | Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	12
Long-term investments [Member] | Recurring [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	6	160
Long-term investments [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Investments	0	0
Long-term investments [Member] | Recurring [Member] | Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0
Long-term investments [Member] | Recurring [Member] | Level 1 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Long-term investments [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	18	160
Investments	18	160
Long-term investments [Member] | Recurring [Member] | Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	12
Long-term investments [Member] | Recurring [Member] | Level 2 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	6	160
Long-term investments [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Investments	0	0
Long-term investments [Member] | Recurring [Member] | Level 3 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	0
Long-term investments [Member] | Recurring [Member] | Level 3 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 0	$ 0

Stockholder's Equity Accelerate

Stockholder's Equity Accelerated Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended					3 Months Ended		4 Months Ended	6 Months Ended
	Aug. 31, 2018	Jun. 30, 2018	May 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Aug. 31, 2018	May 31, 2018	Mar. 31, 2018	Aug. 31, 2017	Mar. 31, 2017
June 2018 ASR [Member]
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Number of Shares Delivered	1.1	6.5				7.6
Accelerated Share Repurchases, Final Price Paid Per Share						$ 79.42
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 600
March 2018 ASR [Member]
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Number of Shares Delivered			0.7	3			3.7
Accelerated Share Repurchases, Final Price Paid Per Share							$ 79.95
Accelerated Share Repurchases, Settlement (Payment) or Receipt				$ 300				$ 300
December 2017 ASR [Member]
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Number of Shares Delivered				0.4	3.6			4
Accelerated Share Repurchases, Final Price Paid Per Share								$ 75.75
Accelerated Share Repurchases, Settlement (Payment) or Receipt					$ 300
March 2017 ASR [Member]
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Number of Shares Delivered									23.7
Accelerated Share Repurchases, Final Price Paid Per Share									$ 63.19
Accelerated Share Repurchases, Settlement (Payment) or Receipt										$ 1,500

Stockholder's Equity Share Repu

Stockholder's Equity Share Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock, Value	$ 994	$ 1,557
Stock Repurchase Program, Authorized Amount	$ 3,500
Share Repurchase Program, Stock-based Compensation Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock, Shares	0.9	0.9
Repurchases of common stock, Value	$ 69	$ 57
Common Class A [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock, Shares	0.3
Repurchases of common stock, Value	$ 25
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 775

Stockholder's Equity Dividend (

Stockholder's Equity Dividend (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Equity [Abstract]
Dividends per Share (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.15	$ 0.15	$ 0.15
Amount	$ 117	$ 119	$ 119	$ 89	$ 90	$ 89	$ 355	$ 179	$ 268

Stockholder's Equity Accumulate

Stockholder's Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance			$ 10,669	$ 10,728
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change, Net of Tax Amount	$ (12)	$ 33	(46)	100
Cumulative effect of changes in accounting principle	121		121
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	0	0	(6)	2
Other comprehensive income (loss)	(94)	11	(257)	158
AOCI, ending balance	10,978	10,979	10,978	10,979
Foreign currency translation adjustments: [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(79)	(82)	(38)	(149)
AOCI tax, beginning balance	7	0	0	0
AOCI, beginning balance	(72)	(82)	(38)	(149)
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change, Before Tax Amount	(14)	33	(55)	100
Net change, Tax Effect	(2)	0	(9)	0
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other comprehensive income (loss)		33		100
AOCI before tax, ending balance	(93)	(49)	(93)	(49)
AOCI tax, ending balance	9	0	9	0
AOCI, ending balance	(84)	(49)	(84)	(49)
Unrealized gains (losses) on available-for-sale investment securities: [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(19)	(3)	(11)	(6)
AOCI tax, beginning balance	5	1	4	2
AOCI, beginning balance	(14)	(2)	(7)	(4)
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change, Before Tax Amount	0	0	(8)	3
Net change, Tax Effect	0	0	(1)	1
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
OCI, before reclassifications, before tax	(1)	(1)	(11)	2
Other comprehensive income (loss) before reclassifications, tax	0	0	2	(1)
OCI, before reclassifications, net of tax	(1)	(1)	(9)	1
Reclassification from AOCI, current period, before tax	1	1	3	1
Reclassification from AOCI, current period, tax	0	0	0	0
Reclassification from AOCI, current period, net of tax	1	1	3	1
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent			(7)
Other comprehensive income (loss)	0	0		2
AOCI before tax, ending balance	(19)	(3)	(19)	(3)
AOCI tax, ending balance	5	1	5	1
AOCI, ending balance	(14)	(2)	(14)	(2)
Unrealized gains on cash flow hedges: [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(7)	155	154	51
AOCI tax, beginning balance	(1)	(38)	(39)	(12)
AOCI, beginning balance	(8)	117	115	39
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change, Before Tax Amount	(103)	(28)	(264)	76
Net change, Tax Effect	(21)	(6)	(59)	20
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
OCI, before reclassifications, before tax	(96)	6	(201)	165
Other comprehensive income (loss) before reclassifications, tax	20	(2)	44	(41)
OCI, before reclassifications, net of tax	(76)	4	(157)	124
Other comprehensive income (loss)	(82)	(22)	(205)	56
AOCI before tax, ending balance	(110)	127	(110)	127
AOCI tax, ending balance	20	(32)	20	(32)
AOCI, ending balance	(90)	95	(90)	95
Unrealized gains on cash flow hedges: [Member] | Cost of revenues [Member]
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Reclassification from AOCI, current period, before tax	(6)	(29)	(54)	(75)
Reclassification from AOCI, current period, tax	1	7	13	18
Reclassification from AOCI, current period, net of tax	(5)	(22)	(41)	(57)
Unrealized gains on cash flow hedges: [Member] | Selling, general and administrative expenses [Member]
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Reclassification from AOCI, current period, before tax	(1)	(5)	(9)	(14)
Reclassification from AOCI, current period, tax	0	1	2	3
Reclassification from AOCI, current period, net of tax	(1)	(4)	(7)	(11)
Accumulated other comprehensive income (loss):
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(105)	70	105	(104)
AOCI tax, beginning balance	11	(37)	(35)	(10)
AOCI, beginning balance	(94)	33	70	(114)
Other Comprehensive Income (Loss), before Tax [Abstract]
Net change, Before Tax Amount	(117)	5	(327)	179
Net change, Tax Effect	(23)	(6)	(69)	21
Cumulative Tax Effect Of New Accounting Principle In Period Of Adoption	0		(1)
Cumulative effect of changes in accounting principle	(1)		(1)
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other comprehensive income (loss)	(94)	11	(258)	158
AOCI before tax, ending balance	(222)	75	(222)	75
AOCI tax, ending balance	34	(31)	34	(31)
AOCI, ending balance	$ (188)	$ 44	$ (188)	$ 44

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	$ 734	$ 674	$ 2,250	$ 2,069
Loss contingency accrual						$ 0
Insurance receivable for malpractice	1		1
Out of period adjustment [Member] | Internal Investigation and Related Matters [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses					$ 4
FCPA Accrual [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Loss contingency accrual	$ 28		$ 28

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Related Party Transactions [Abstract]
Services performed by related party	$ 1	$ 4

Segment Information (Revenues F

Segment Information (Revenues From External Customers And Segment Operating Profit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 4,078	$ 3,766	$ 11,996	$ 10,982
Income from operations	745	648	2,108	1,824
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	1,279	1,235	3,735	3,464
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Revenues	1,464	1,427	4,394	4,209
Income from operations	446	476	1,355	1,348
Operating Segments [Member] | Healthcare [Member]
Segment Reporting Information [Line Items]
Revenues	1,189	1,085	3,466	3,138
Income from operations	382	352	1,077	971
Operating Segments [Member] | Products and Resources [Member]
Segment Reporting Information [Line Items]
Revenues	863	774	2,524	2,258
Income from operations	267	248	781	695
Operating Segments [Member] | Communications, Media and Technology [Member]
Segment Reporting Information [Line Items]
Revenues	562	480	1,612	1,377
Income from operations	184	159	522	450
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated costs	$ 534	$ 587	$ 1,627	$ 1,640

Segment Information (Revenues A

Segment Information (Revenues And Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 4,078	$ 3,766	$ 11,996	$ 10,982
Long-lived Assets	1,362		1,362		$ 1,324
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,107	2,891	9,149	8,503
Long-lived Assets	420		420		360
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	325	301	944	863
Europe, excluding United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	398	327	1,153	903
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	723	628	2,097	1,766
Long-lived Assets	90		90		63
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	248	$ 247	750	$ 713
Long-lived Assets	$ 852		$ 852		$ 901

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 29, 2018	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Dividends declared per common share			$ 0.20	$ 0.15	$ 0.60	$ 0.30
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared per common share	$ 0.20
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Consideration transferred		$ 635