Cognizant Technology Solutions (CTSH) 10-Q 7 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
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		585,898,903

Consolidated Statements Of Fina

Consolidated Statements Of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,440	$ 1,925
Short-term investments	3,390	3,131
Trade accounts receivable, net of allowances of $66 and $65, respectively	3,145	2,865
Unbilled accounts receivable	0	357
Restricted cash	159	0
Other current assets	856	833
Total current assets	8,990	9,111
Property and equipment, net	1,333	1,324
Goodwill	2,713	2,704
Intangible assets, net	955	981
Deferred income tax assets, net	394	418
Long-term investments	83	235
Other noncurrent assets	577	448
Total assets	15,045	15,221
Liabilities and Stockholders’ Equity
Accounts payable	293	210
Deferred revenue	360	383
Short-term debt	100	175
Accrued expenses and other current liabilities	1,716	2,071
Total current liabilities	2,469	2,839
Deferred revenue, noncurrent	70	104
Deferred income tax liabilities, net	113	146
Long-term debt	673	698
Long-term income taxes payable	533	584
Other noncurrent liabilities	199	181
Total liabilities	4,057	4,552
Commitments and contingencies (See Note 11)
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, 586 and 588 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	6	6
Additional paid-in capital	63	49
Retained earnings	10,856	10,544
Accumulated other comprehensive income (loss)	63	70
Total stockholders’ equity	10,988	10,669
Total liabilities and stockholders’ equity	$ 15,045	$ 15,221

Consolidated Statements Of Fin3

Consolidated Statements Of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances	$ 66	$ 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	586,000,000	588,000,000
Class A common stock, shares outstanding	586,000,000	588,000,000

Consolidated Statements Of Oper

Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 3,912	$ 3,546
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	2,401	2,194
Selling, general and administrative expenses	711	686
Depreciation and amortization expense	107	96
Income from operations	693	570
Other income (expense), net:
Interest income	41	32
Interest expense	(6)	(6)
Foreign currency exchange gains (losses), net	(31)	52
Other, net	0	1
Total other income (expense), net	4	79
Income before provision for income taxes	697	649
Provision for income taxes	(177)	(92)
Income from equity method investments	0	0
Net income	$ 520	$ 557
Basic earnings per share (usd per share)	$ 0.89	$ 0.92
Diluted earnings per share (usd per share)	$ 0.88	$ 0.92
Weighted average number of common shares outstanding - Basic (shares)	587	605
Dilutive effect of shares issuable under stock-based compensation plans (shares)	2	2
Weighted average number of common shares outstanding - Diluted (shares)	589	607
Dividends declared per common share	$ 0.20	$ 0

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 520	$ 557
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	37	17
Change in unrealized gains and losses on cash flow hedges, net of taxes	(36)	79
Change in unrealized gains and losses on available-for-sale securities, net of taxes	(7)	1
Other comprehensive income (loss)	(6)	97
Comprehensive income	$ 514	$ 654

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (unaudited) Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated other comprehensive income (loss):
Class A common stock, shares outstanding		608
Stockholders' Equity Attributable to Parent	$ 10,728	$ 6	$ 358	$ 10,478	$ (114)
Net income	557			557
Other comprehensive income (loss)	97				97
Common stock issued, stock-based compensation plans - shares		3
Common stock issued, stock-based compensation plans - value	61		61
Stock-based compensation expense	54		54
Repurchases of common stock, Shares		(22)
Repurchases of common stock, Value	(1,514)		(414)	(1,100)
Dividends	(268)
Class A common stock, shares outstanding		589
Stockholders' Equity Attributable to Parent	$ 9,983	$ 6	59	9,935	(17)
Class A common stock, shares outstanding	588	588
Stockholders' Equity Attributable to Parent	$ 10,669	$ 6	49	10,544	70
Net income	520			520
Other comprehensive income (loss)	(6)				(6)
Common stock issued, stock-based compensation plans - shares		2
Common stock issued, stock-based compensation plans - value	60		60
Stock-based compensation expense	59		59
Repurchases of common stock, Shares		(4)
Repurchases of common stock, Value	(316)		(105)	(211)
Dividends	$ (119)			(119)
Class A common stock, shares outstanding	586	586
Stockholders' Equity Attributable to Parent	$ 10,988	$ 6	$ 63	10,856	63
Cumulative effect of changes in accounting principle	$ 121			$ 122	$ (1)

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,599	$ 1,308
Cash flows from operating activities:
Net income	520	557
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	117	104
Provision for doubtful accounts	2	9
Deferred income taxes	2	9
Stock-based compensation expense	59	54
Other	23	(55)
Changes in assets and liabilities:
Trade accounts receivable	(273)	(86)
Other current assets	352	20
Other noncurrent assets	(105)	(31)
Accounts payable	86	13
Deferred revenues, current and noncurrent	(2)	67
Other current and noncurrent liabilities	(393)	(384)
Net cash provided by operating activities	388	277
Cash flows from investing activities:
Purchases of property and equipment	(96)	(66)
Purchases of available-for-sale investment securities	(300)	(1,176)
Proceeds from maturity or sale of available-for-sale investment securities	193	1,488
Purchases of held-to-maturity investment securities	(222)	(349)
Proceeds from maturity of held-to-maturity investment securities	171	15
Purchases of other investments	(31)	(59)
Proceeds from maturity or sale of other investments	59	244
Payments for business combinations, net of cash acquired	(1)	(6)
Net cash (used in) provided by investing activities	(227)	91
Cash flows from financing activities:
Issuance of common stock under stock-based compensation plans	60	61
Repurchases of common stock	(316)	(1,514)
Repayment of term loan borrowings and capital lease obligations	(39)	(21)
Net change in notes outstanding under the revolving credit facility	(75)	350
Dividends paid	(118)	0
Net cash (used in) financing activities	(488)	(1,124)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1	30
(Decrease) in cash, cash equivalents and restricted cash	(326)	(726)
Cash and cash equivalents, beginning of year	1,925	2,034
Cash, cash equivalents and restricted cash, end of period	$ 1,440	$ 1,308

Interim Condensed Consolidated

Interim Condensed Consolidated Financial Statements	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Condensed 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. As of March 31, 2018, we had a restricted cash balance of $159 million. There were no restricted cash balances in prior periods. Accordingly, the adoption of this update resulted in an increase to the ending cash, cash equivalents and restricted cash balance presented on our unaudited consolidated statement of cash flows for the three months ended March 31, 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 newly-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 methods of adoption are in the process of being finalized by the Financial Accounting Standards Board. We expect the requirement to recognize a right-of-use asset and a lease liability for operating leases to have a material impact on the presentation of our consolidated statements of financial position. 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 are currently evaluating the effect the amendments will have on our consolidated financial statements and related disclosures.

Internal Investigation and Rela

Internal Investigation and Related Matters	3 Months Ended
	Mar. 31, 2018
Internal Investigation and Related Matters [Abstract]
Internal Investigation and Related Matters	We are conducting an 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 is also examining 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 is being conducted under the oversight of the Audit Committee, with the assistance of outside counsel. To date, the investigation has identified a total of approximately $6 million in payments made between 2009 and 2016 that may have been improper. During the year ended December 31, 2016, we recorded out-of-period corrections related to $4 million of such payments that had been previously capitalized that should have been expensed. These out-of-period corrections and the other $2 million in potentially improper payments were not material to any previously issued financial statements. There were no adjustments recorded during 2018 and 2017 related to the amounts under investigation.

Revenues

Revenues	3 Months Ended
	Mar. 31, 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 months ended March 31, 2018, to the pro-forma amounts had the previous guidance been in effect, or Pro-forma Amounts: March 31, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) Assets: Trade accounts receivable, net (1), (2) $ 3,145 $ 3,015 $ 130 Unbilled accounts receivable (1), (3) — 412 (412 ) Other current assets (2), (3) 856 549 307 Total current assets 25 Other noncurrent assets (4) 577 533 44 Total assets $ 69 Liabilities: Deferred revenue (2) $ 360 $ 471 $ (111 ) Total current liabilities (111 ) Deferred revenue, noncurrent (2) 70 79 (9 ) Deferred income tax liabilities, net (5) 113 70 43 Total liabilities (77 ) Stockholders’ equity: Retained earnings 10,856 10,712 144 Accumulated other comprehensive income (loss) (6) 63 61 2 Total stockholders’ equity 146 Total liabilities and stockholders’ equity $ 69 Three Months Ended March 31, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) Revenues (2) $ 3,912 $ 3,891 $ 21 Cost of revenues (4) 2,401 2,409 (8 ) Selling, general and administrative expenses 711 711 — Depreciation and amortization expense 107 107 — Income from operations 693 664 29 Other income (expense), net 4 4 — Income before provision for income taxes (5) 697 668 29 Provision for income taxes (177 ) (171 ) (6 ) Net income $ 520 $ 497 $ 23 Basic earnings per share $ 0.89 $ 0.85 $ 0.04 Diluted earnings per share $ 0.88 $ 0.84 $ 0.04 (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. (6) Reflects the impact of foreign currency translation related to the above impacts. 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, as well as 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 three months ended March 31, 2018 . Costs to obtain contracts are immaterial for the periods disclosed and were expensed as incurred. Costs to Fulfill (in millions) Balance - January 1, 2018 $ 303 Amortization expense (14 ) Costs capitalized 39 Other 2 Balance - March 31, 2018 $ 330 Costs to fulfill are recorded in "Other noncurrent assets" in our consolidated statements of financial position. 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. 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 225 Amounts reclassified to accounts receivable (225 ) Other 1 Balance - March 31, 2018 $ 307 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 99 Revenues recognized related to the opening balance of deferred revenue (100 ) Balance - March 31, 2018 $ 430 Our contract assets and liabilities are reported in a net position on a contract by contract basis at the end of each reporting period. Revenues recognized during the three months ended March 31, 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 March 31, 2018. This disclosure is not required for: (1) contracts with an original duration of one year or less, including contracts that can be terminated for convenience without a substantive penalty, (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 March 31, 2018, the aggregate amount of transaction price allocated to remaining performance obligations, other than those meeting the exclusion criteria above, was $1,752 million , of which approximately 70% is expected to be recognized as revenues within 2 years, and the remainder thereafter. 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 March 31, 2018 Financial Services Healthcare Products and Resources Communications, Media and Technology Total (in millions) Revenues Geography: North America $ 1,044 $ 1,023 $ 572 $ 336 $ 2,975 United Kingdom 116 23 87 84 310 Rest of Europe 162 61 109 42 374 Europe - Total 278 84 196 126 684 Rest of World 139 14 53 47 253 Total $ 1,461 $ 1,121 $ 821 $ 509 $ 3,912 Service line: Consulting and technology services $ 871 $ 638 $ 481 $ 278 $ 2,268 Outsourcing services 590 483 340 231 1,644 Total $ 1,461 $ 1,121 $ 821 $ 509 $ 3,912 Type of contract: Time and materials $ 935 $ 448 $ 369 $ 306 $ 2,058 Fixed-price 471 511 361 179 1,522 Transaction or volume-based 55 162 91 24 332 Total $ 1,461 $ 1,121 $ 821 $ 509 $ 3,912

Investments

Investments	3 Months Ended
	Mar. 31, 2018
Investments [Abstract]
Investments	Our investments were as follows: March 31, 2018 December 31, 2017 (in millions) Short-term investments: Equity investment securities $ 25 $ 25 Available-for-sale investment securities 2,069 1,972 Held-to-maturity investment securities 943 745 Time deposits (1) 353 389 Total short-term investments $ 3,390 $ 3,131 Long-term investments: Equity and cost method investments $ 77 $ 74 Held-to-maturity investment securities 6 161 Total long-term investments $ 83 $ 235 (1) Includes $348 million in restricted time deposits as of March 31, 2018. See Note 14 . 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 months ended March 31, 2018 and 2017 were immaterial. The value of the fixed income mutual fund invested in fixed income securities 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 months ended March 31, 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 March 31, 2018 were as follows: Amortized Cost Unrealized Gains Unrealized Losses Fair (in millions) U.S. Treasury and agency debt securities $ 643 $ — $ (9 ) $ 634 Corporate and other debt securities 448 — (6 ) 442 Certificates of deposit and commercial paper 563 — — 563 Asset-backed securities 305 — (3 ) 302 Municipal debt securities 129 — (1 ) 128 Total available-for-sale investment securities $ 2,088 $ — $ (19 ) $ 2,069 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 March 31, 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 $ 517 $ (7 ) $ 94 $ (2 ) $ 611 $ (9 ) Corporate and other debt securities 331 (5 ) 111 (1 ) 442 (6 ) Certificates of deposit and commercial paper 399 — — — 399 — Asset-backed securities 214 (2 ) 85 (1 ) 299 (3 ) Municipal debt securities 107 (1 ) 16 — 123 (1 ) Total $ 1,568 $ (15 ) $ 306 $ (4 ) $ 1,874 $ (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 March 31, 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 March 31, 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 March 31, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 729 $ 728 Due after one year up to two years 500 494 Due after two years up to three years 495 487 Due after three years 59 58 Asset-backed securities 305 302 Total available-for-sale investment securities $ 2,088 $ 2,069 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 2018 2017 (in millions) Proceeds from sales of available-for-sale investment securities $ 125 $ 1,248 Gross gains $ — $ 1 Gross losses (1 ) (1 ) Net realized (losses) on sales of available-for-sale investment securities $ (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 March 31, 2018 were as follows: Amortized Unrealized Unrealized Fair (in millions) Short-term investments: Corporate and other debt securities $ 481 $ — $ (1 ) $ 480 Commercial paper 462 — (1 ) 461 Total short-term held-to-maturity investments 943 — (2 ) 941 Long-term investments: Corporate and other debt securities 6 — — 6 Total held-to-maturity investment securities $ 949 $ — $ (2 ) $ 947 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 March 31, 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 $ 327 $ (1 ) $ 32 $ — $ 359 $ (1 ) Commercial paper 322 (1 ) — — 322 (1 ) Total $ 649 $ (2 ) $ 32 $ — $ 681 $ (2 ) 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 March 31, 2018 . The contractual maturities of our fixed income held-to-maturity investment securities as of March 31, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 943 $ 941 Due after two years 6 6 Total held-to-maturity investment securities $ 949 $ 947 During the three months ended March 31, 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	3 Months Ended
	Mar. 31, 2018
Payables and Accruals [Abstract]
Accrued Expenses And Other Current Liabilities	Accrued expenses and other current liabilities were as follows: March 31, 2018 December 31, 2017 (in millions) Compensation and benefits $ 848 $ 1,272 Income taxes 74 48 Professional fees 103 100 Travel and entertainment 38 32 Customer volume and other incentives 318 289 Derivative financial instruments 2 5 Other 333 325 Total accrued expenses and other current liabilities $ 1,716 $ 2,071

Debt

Debt	3 Months Ended
	Mar. 31, 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. The term loan and the revolving credit facility both mature in November 2019. All notes drawn to date under the revolving credit facility have been less than 90 days in duration. We are required under the Credit Agreement to make scheduled quarterly principal payments on the term loan. We were in compliance with all debt covenants and representations as of March 31, 2018 . Short-term Debt The following summarizes our short-term debt balances as of: March 31, 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: March 31, 2018 December 31, 2017 (in millions) Term loan, due November 2019 $ 775 $ 800 Less: Current maturities (100 ) (100 ) Deferred financing costs (2 ) (2 ) Long-term debt, net of current maturities $ 673 $ 698

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 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 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. The transition tax on undistributed earnings is payable over eight years. The one-time incremental income tax expense is provisional as it reflects certain assumptions based upon our interpretation of the Tax Reform Act and may change, possibly materially, as we receive additional clarification and guidance and as the interpretation of the Tax Reform Act evolves over time. During the first quarter of 2018, we have not recorded any adjustments to the one-time provisional net income tax expense. We anticipate completing the accounting for the Tax Reform Act within the measurement period. Our Indian subsidiaries, collectively referred to as Cognizant India, are primarily export-oriented and are eligible for certain income tax holiday benefits granted by the government of India for export activities conducted within Special Economic Zones, or SEZs, for periods of up to 15 years . Our Indian profits ineligible for SEZ benefits are subject to corporate income tax at the rate of 34.9% . In addition, all Indian profits, including those generated within SEZs, are subject to the Minimum Alternative Tax, or MAT, at the rate of 21.5% . Any MAT paid is creditable against future Indian corporate income tax, subject to limitations. Our effective income tax rates were as follows: Three Months Ended 2018 2017 Effective income tax rate 25.4 % 14.2 % The effective tax rate for the three months ended March 31, 2017 was affected 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. Our March 31, 2018 effective tax rate benefitted from the new lower U.S. federal statutory corporate income tax rate, partially offset by the estimated incremental income tax expense related to the current interpretation of the GILTI provision of the Tax Reform Act. The estimate of our annual effective income tax rate reflects the current interpretation of the Tax Reform Act 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 $507 million 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 March 31, 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 $76 million , representing 15% of the disputed tax amount related to the 2016 India Cash Remittance, to be kept in a segregated account by the ITD. In addition, the court has placed a lien on certain time deposits of CTS India in the amount of $431 million , which is the remainder of the disputed tax amount related to the 2016 India Cash Remittance. See Note 14 for a description of our restricted assets as of March 31, 2018 relating to this matter.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 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: March 31, 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 $ 97 $ — $ 134 $ — Other noncurrent assets 9 — 20 — Other noncurrent liabilities — 1 — — Total 106 1 154 — Foreign exchange forward contracts – Not designated as hedging instruments Other current assets 1 — — — Accrued expenses and other current liabilities — 2 — 5 Total 1 2 — 5 Total $ 107 $ 3 $ 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 quarter 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 March 31, 2018 , we estimate that $72 million , net of tax, of net gains 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: March 31, 2018 December 31, 2017 (in millions) 2018 $ 983 $ 1,185 2019 885 720 2020 135 — Total notional value of contracts outstanding $ 2,003 $ 1,905 Net unrealized gains included in accumulated other comprehensive income (loss), net of taxes $ 79 $ 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 on our cash flow hedges for the three months ended March 31 : 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 $ (14 ) $ 124 Cost of revenues $ 30 $ 17 Selling, general and administrative expenses 5 3 Total $ 35 $ 20 The activity related to the change in net unrealized gains on our cash flow hedges included in accumulated other comprehensive income (loss) is presented in Note 10 . Other Derivatives We use foreign exchange forward contracts, which have not been designated as hedges, to hedge balance sheet exposure to certain monetary assets and liabilities denominated in currencies, primarily the Indian rupee and British pound, 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: March 31, 2018 December 31, 2017 Notional Fair Value Notional Fair Value (in millions) Contracts outstanding $ 301 $ (1 ) $ 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 months ended March 31 : Location of Net Gains (Losses) on Derivative Instruments Amount of Net Gains (Losses) on Derivative Instruments 2018 2017 (in millions) Foreign exchange forward contracts – Not designated as hedging instruments Foreign currency exchange gains (losses), net $ 2 $ (10 ) 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	3 Months Ended
	Mar. 31, 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 March 31, 2018 : Level 1 Level 2 Level 3 Total (in millions) Cash equivalents: Money market funds $ 335 $ — $ — $ 335 Commercial paper — 248 — 248 Total cash equivalents 335 248 — 583 Short-term investments: Time deposits (1) — 353 — 353 Available-for-sale investment securities: U.S. Treasury and agency debt securities 566 68 — 634 Corporate and other debt securities — 442 — 442 Certificates of deposit and commercial paper — 563 — 563 Asset-backed securities — 302 — 302 Municipal debt securities — 128 — 128 Total available-for-sale investment securities 566 1,503 — 2,069 Held-to-maturity investment securities: Commercial paper — 461 — 461 Corporate and other debt securities — 480 — 480 Total short-term held-to-maturity investment securities — 941 — 941 Total short-term investments (2) 566 2,797 — 3,363 Long-term investments: Held-to-maturity investment securities: Corporate and other debt securities — 6 — 6 Total long-term held-to-maturity investment securities — 6 — 6 Total long-term investments (3) — 6 — 6 Derivative financial instruments - foreign exchange forward contracts: Other current assets — 98 — 98 Accrued expenses and other current liabilities — (2 ) — (2 ) Other noncurrent assets — 9 — 9 Other noncurrent liabilities — (1 ) — (1 ) Total $ 901 $ 3,155 $ — $ 4,056 (1) Includes $348 million in restricted time deposits. See Note 14 . (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 $77 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: Commercial paper — 397 — 397 Corporate and other debt securities — 345 — 345 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 March 31, 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 three months ended March 31, 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	3 Months Ended
	Mar. 31, 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 three months ended March 31, 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) March 2018 ASR (1) 3.0 (1) (1) $ 300 December 2017 ASR March 2018 4.0 (2) $ 75.75 $ 300 March 2017 ASR August 2017 23.7 $ 63.19 $ 1,500 ___________________ (1) Under the terms of the March 2018 ASR and in exchange for up-front payments of $300 million , the financial institution initially delivered 3.0 million shares, a portion of the Company's total expected shares to be repurchased under the March 2018 ASR. The total number of shares ultimately delivered, and therefore the average price paid per share, will be determined at the end of the purchase period, which is scheduled to end during the second quarter of 2018, based on the volume-weighted average price of the Company's common stock during that period. (2) 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. 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 March 31, 2018, the remaining available balance under our stock repurchase program was $1,400 million . Stock repurchases were made in connection with our stock-based compensation plans, whereby Company shares were tendered by employees for payment of applicable statutory tax withholdings. For the three months ended March 31, 2018 and 2017, such repurchases totaled 0.2 million shares at an aggregate cost of $16 million , and 0.2 million shares at an aggregate cost of $14 million , respectively. Dividends Dividends on our Class A common stock during the periods presented were as follows: Dividends per Share Amount (in millions) 2018: Three months ended March 31, 2018 $ 0.20 $ 119 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 months ended March 31, 2018 : Three Months Before Tax Amount Tax Effect Net of Tax Amount (in millions) Foreign currency translation adjustments: Beginning balance $ (38 ) $ — $ (38 ) Change in foreign currency translation adjustments 41 (4 ) 37 Ending balance $ 3 $ (4 ) $ (1 ) Unrealized (losses) on available-for-sale investment securities: Beginning balance $ (11 ) $ 4 $ (7 ) Cumulative effect of change in accounting principle (1) — (1 ) (1 ) Net unrealized (losses) arising during the period (9 ) 1 (8 ) Reclassification of net losses to Other, net 1 — 1 Net change (8 ) — (8 ) Ending balance $ (19 ) $ 4 $ (15 ) Unrealized gains on cash flow hedges: Beginning balance $ 154 $ (39 ) $ 115 Unrealized (losses) arising during the period (14 ) 5 (9 ) Reclassifications of net (gains) to: Cost of revenues (30 ) 7 (23 ) Selling, general and administrative expenses (5 ) 1 (4 ) Net change (49 ) 13 (36 ) Ending balance $ 105 $ (26 ) $ 79 Accumulated other comprehensive income (loss): Beginning balance $ 105 $ (35 ) $ 70 Other comprehensive income (loss) (16 ) 9 (7 ) Ending balance $ 89 $ (26 ) $ 63 (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 months ended March 31, 2017 : Three Months Before Tax Amount Tax Effect Net of Tax Amount (in millions) Foreign currency translation adjustments: Beginning balance $ (149 ) $ — $ (149 ) Change in foreign currency translation adjustments 17 — 17 Ending balance $ (132 ) $ — $ (132 ) Unrealized gains on available-for-sale investment securities: Beginning balance $ (6 ) $ 2 $ (4 ) Net unrealized gains arising during the period 2 (1 ) 1 Reclassification of net (gains) to Other, net — — — Net change 2 (1 ) 1 Ending balance $ (4 ) $ 1 $ (3 ) Unrealized gains (losses) on cash flow hedges: Beginning balance $ 51 $ (12 ) $ 39 Unrealized gains arising during the period 124 (30 ) 94 Reclassifications of net (gains) to: Cost of revenues (17 ) 4 (13 ) Selling, general and administrative expenses (3 ) 1 (2 ) Net change 104 (25 ) 79 Ending balance $ 155 $ (37 ) $ 118 Accumulated other comprehensive income (loss): Beginning balance $ (104 ) $ (10 ) $ (114 ) Other comprehensive income (loss) 123 (26 ) 97 Ending balance $ 19 $ (36 ) $ (17 )

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 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 are conducting an 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 is also examining 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 is being conducted under the oversight of the Audit Committee, with the assistance of outside counsel. To date, the investigation has identified a total of approximately $6 million in payments made between 2009 and 2016 that may have been improper. During the year ended December 31, 2016, we recorded out-of-period corrections related to $4 million of such payments that were previously capitalized that should have been expensed. These out-of-period corrections and the other $2 million in potentially improper payments were not material to any previously issued financial statements. There were no adjustments recorded during 2018 and 2017 related to the amounts under investigation. 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. Under a stipulation filed by the parties on February 23, 2017, defendants filed motions to dismiss the consolidated amended complaint on June 6, 2017, plaintiffs filed an opposition brief on July 21, 2017 responding to defendants’ motions to dismiss, and defendants filed reply briefs in further support of their motions to dismiss on September 5, 2017. On September 5, 2017, defendants also filed a motion to strike certain allegations in the consolidated amended complaint, plaintiffs filed an opposition to the motion to strike on October 2, 2017, and, on October 10, 2017, we filed a reply brief in further support of the motion to strike. 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 internal investigation, any investigations by the DOJ or the SEC, 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. 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. 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. 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. Furthermore, 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 ongoing 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 March 31, 2018 as we cannot estimate the ultimate outcome at this time but have expensed payments made through March 31, 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 March 31, 2018. See Note 7 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	3 Months Ended
	Mar. 31, 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 months ended March 31, 2017, Goodwin performed legal services for the Company for which it earned approximately $2 million . 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 three months ended March 31, 2018, Goodwin was not a related party of the Company.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 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. 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 profit, before unallocated expenses, by reportable segment were as follows: Three Months Ended 2018 2017 (in millions) Revenues: Financial Services $ 1,461 $ 1,376 Healthcare 1,121 1,003 Products and Resources 821 737 Communications, Media and Technology 509 430 Total revenues $ 3,912 $ 3,546 Segment Operating Profit: Financial Services $ 447 $ 427 Healthcare 338 274 Products and Resources 256 217 Communications, Media and Technology 159 135 Total segment operating profit 1,200 1,053 Less: unallocated costs 507 483 Income from operations $ 693 $ 570 Geographic Area Information Revenue and long-lived assets, by geographic area, are as follows: Three Months Ended 2018 2017 (in millions) Revenues: (1) North America (2) $ 2,975 $ 2,761 United Kingdom 310 274 Rest of Europe 374 285 Europe - Total 684 559 Rest of World (3) 253 226 Total $ 3,912 $ 3,546 As of March 31, 2018 December 31, 2017 (in millions) Long-lived Assets: (4) North America (2) $ 387 $ 360 Europe 66 63 Rest of World (3)(5) 880 901 Total $ 1,333 $ 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)	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Business Combination In April 2018, we completed the previously announced acquisition of Bolder Healthcare Solutions, a privately-held U.S. provider of revenue cycle management solutions to the healthcare industry for initial consideration of approximately $477 million . This acquisition expands our healthcare consulting, technology, and business process services portfolio and strengthens our position in digital healthcare technology and operations. Restricted Cash and Time Deposits Based on the April 2018 events related to the dispute with the ITD with respect to the 2016 India Cash Remittance described in Note 7 , we have classified the March 31, 2018 cash and time deposits affected by the dispute with the ITD as restricted assets. The following table summarizes total restricted assets that are included in our consolidated statements of financial position as of March 31, 2018: Restricted Assets (in millions) Restricted cash (1) $ 159 Short-term investments (2) 348 Total restricted assets at March 31, 2018 $ 507 (1) The restricted cash balance at March 31, 2018 is composed of $76 million of cash that in April 2018 was placed in a segregated account with the ITD and $83 million of cash that, in April 2018, was invested into a time deposit and placed under lien by court order. (2) The restricted short-term investments balance consists of time deposits in India as of March 31, 2018 that were subsequently restricted by court order in April 2018. This balance of $348 million , together with the additional deposit of $83 million described in note (1) , comprise the $431 million of deposits currently subject to lien. There were no restricted cash and deposits as of December 31, 2017. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated statements of financial position to the amounts shown in the consolidated statements of cash flows: March 31 2018 2017 (in millions) Cash and cash equivalents $ 1,440 $ 1,308 Restricted cash 159 — Total cash, cash equivalents and restricted cash $ 1,599 $ 1,308 See Note 7 for additional information on the ITD Dispute. Dividend On May 4, 2018, our Board of Directors approved the Company's declaration of a $0.20 per share dividend with a record date of May 22, 2018 and a payment date of May 31, 2018.

Interim Condensed Consolidate22

Interim Condensed Consolidated Financial Statements (Policies)	3 Months Ended
	Mar. 31, 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. As of March 31, 2018, we had a restricted cash balance of $159 million. There were no restricted cash balances in prior periods. Accordingly, the adoption of this update resulted in an increase to the ending cash, cash equivalents and restricted cash balance presented on our unaudited consolidated statement of cash flows for the three months ended March 31, 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 newly-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 methods of adoption are in the process of being finalized by the Financial Accounting Standards Board. We expect the requirement to recognize a right-of-use asset and a lease liability for operating leases to have a material impact on the presentation of our consolidated statements of financial position. 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 are currently evaluating the effect the amendments 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. 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. 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. Our contract assets and liabilities are reported in a net position on a contract by contract basis at the end of each reporting period. 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, as well as 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.

Revenues (Tables)

Revenues (Tables)	3 Months Ended
	Mar. 31, 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 months ended March 31, 2018, to the pro-forma amounts had the previous guidance been in effect, or Pro-forma Amounts: March 31, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) Assets: Trade accounts receivable, net (1), (2) $ 3,145 $ 3,015 $ 130 Unbilled accounts receivable (1), (3) — 412 (412 ) Other current assets (2), (3) 856 549 307 Total current assets 25 Other noncurrent assets (4) 577 533 44 Total assets $ 69 Liabilities: Deferred revenue (2) $ 360 $ 471 $ (111 ) Total current liabilities (111 ) Deferred revenue, noncurrent (2) 70 79 (9 ) Deferred income tax liabilities, net (5) 113 70 43 Total liabilities (77 ) Stockholders’ equity: Retained earnings 10,856 10,712 144 Accumulated other comprehensive income (loss) (6) 63 61 2 Total stockholders’ equity 146 Total liabilities and stockholders’ equity $ 69 Three Months Ended March 31, 2018 As Reported Pro-forma Amounts Impacts of the New Revenue Standard (in millions) Revenues (2) $ 3,912 $ 3,891 $ 21 Cost of revenues (4) 2,401 2,409 (8 ) Selling, general and administrative expenses 711 711 — Depreciation and amortization expense 107 107 — Income from operations 693 664 29 Other income (expense), net 4 4 — Income before provision for income taxes (5) 697 668 29 Provision for income taxes (177 ) (171 ) (6 ) Net income $ 520 $ 497 $ 23 Basic earnings per share $ 0.89 $ 0.85 $ 0.04 Diluted earnings per share $ 0.88 $ 0.84 $ 0.04 (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. (6) Reflects the impact of foreign currency translation related to the above impacts.
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 three months ended March 31, 2018 . Costs to obtain contracts are immaterial for the periods disclosed and were expensed as incurred. Costs to Fulfill (in millions) Balance - January 1, 2018 $ 303 Amortization expense (14 ) Costs capitalized 39 Other 2 Balance - March 31, 2018 $ 330
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 225 Amounts reclassified to accounts receivable (225 ) Other 1 Balance - March 31, 2018 $ 307 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 99 Revenues recognized related to the opening balance of deferred revenue (100 ) Balance - March 31, 2018 $ 430
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 March 31, 2018 Financial Services Healthcare Products and Resources Communications, Media and Technology Total (in millions) Revenues Geography: North America $ 1,044 $ 1,023 $ 572 $ 336 $ 2,975 United Kingdom 116 23 87 84 310 Rest of Europe 162 61 109 42 374 Europe - Total 278 84 196 126 684 Rest of World 139 14 53 47 253 Total $ 1,461 $ 1,121 $ 821 $ 509 $ 3,912 Service line: Consulting and technology services $ 871 $ 638 $ 481 $ 278 $ 2,268 Outsourcing services 590 483 340 231 1,644 Total $ 1,461 $ 1,121 $ 821 $ 509 $ 3,912 Type of contract: Time and materials $ 935 $ 448 $ 369 $ 306 $ 2,058 Fixed-price 471 511 361 179 1,522 Transaction or volume-based 55 162 91 24 332 Total $ 1,461 $ 1,121 $ 821 $ 509 $ 3,912

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Schedule of Investments [Line Items]
Investments	Our investments were as follows: March 31, 2018 December 31, 2017 (in millions) Short-term investments: Equity investment securities $ 25 $ 25 Available-for-sale investment securities 2,069 1,972 Held-to-maturity investment securities 943 745 Time deposits (1) 353 389 Total short-term investments $ 3,390 $ 3,131 Long-term investments: Equity and cost method investments $ 77 $ 74 Held-to-maturity investment securities 6 161 Total long-term investments $ 83 $ 235
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 March 31, 2018 were as follows: Amortized Cost Unrealized Gains Unrealized Losses Fair (in millions) U.S. Treasury and agency debt securities $ 643 $ — $ (9 ) $ 634 Corporate and other debt securities 448 — (6 ) 442 Certificates of deposit and commercial paper 563 — — 563 Asset-backed securities 305 — (3 ) 302 Municipal debt securities 129 — (1 ) 128 Total available-for-sale investment securities $ 2,088 $ — $ (19 ) $ 2,069 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 March 31, 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 $ 517 $ (7 ) $ 94 $ (2 ) $ 611 $ (9 ) Corporate and other debt securities 331 (5 ) 111 (1 ) 442 (6 ) Certificates of deposit and commercial paper 399 — — — 399 — Asset-backed securities 214 (2 ) 85 (1 ) 299 (3 ) Municipal debt securities 107 (1 ) 16 — 123 (1 ) Total $ 1,568 $ (15 ) $ 306 $ (4 ) $ 1,874 $ (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 March 31, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 729 $ 728 Due after one year up to two years 500 494 Due after two years up to three years 495 487 Due after three years 59 58 Asset-backed securities 305 302 Total available-for-sale investment securities $ 2,088 $ 2,069
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 2018 2017 (in millions) Proceeds from sales of available-for-sale investment securities $ 125 $ 1,248 Gross gains $ — $ 1 Gross losses (1 ) (1 ) Net realized (losses) on sales of available-for-sale investment securities $ (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 March 31, 2018 were as follows: Amortized Unrealized Unrealized Fair (in millions) Short-term investments: Corporate and other debt securities $ 481 $ — $ (1 ) $ 480 Commercial paper 462 — (1 ) 461 Total short-term held-to-maturity investments 943 — (2 ) 941 Long-term investments: Corporate and other debt securities 6 — — 6 Total held-to-maturity investment securities $ 949 $ — $ (2 ) $ 947 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 March 31, 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 $ 327 $ (1 ) $ 32 $ — $ 359 $ (1 ) Commercial paper 322 (1 ) — — 322 (1 ) Total $ 649 $ (2 ) $ 32 $ — $ 681 $ (2 ) 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 March 31, 2018 are set forth in the following table: Amortized Cost Fair Value (in millions) Due within one year $ 943 $ 941 Due after two years 6 6 Total held-to-maturity investment securities $ 949 $ 947

Accrued Expenses And Other Cu25

Accrued Expenses And Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Payables and Accruals [Abstract]
Accrued Expenses And Other Current Liabilities	Accrued expenses and other current liabilities were as follows: March 31, 2018 December 31, 2017 (in millions) Compensation and benefits $ 848 $ 1,272 Income taxes 74 48 Professional fees 103 100 Travel and entertainment 38 32 Customer volume and other incentives 318 289 Derivative financial instruments 2 5 Other 333 325 Total accrued expenses and other current liabilities $ 1,716 $ 2,071

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Summary of Short-term Debt	Short-term Debt The following summarizes our short-term debt balances as of: March 31, 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	Long-term Debt The following summarizes our long-term debt balances as of: March 31, 2018 December 31, 2017 (in millions) Term loan, due November 2019 $ 775 $ 800 Less: Current maturities (100 ) (100 ) Deferred financing costs (2 ) (2 ) Long-term debt, net of current maturities $ 673 $ 698

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule Of Effective Income Tax Rates	Our effective income tax rates were as follows: Three Months Ended 2018 2017 Effective income tax rate 25.4 % 14.2 %

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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: March 31, 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 $ 97 $ — $ 134 $ — Other noncurrent assets 9 — 20 — Other noncurrent liabilities — 1 — — Total 106 1 154 — Foreign exchange forward contracts – Not designated as hedging instruments Other current assets 1 — — — Accrued expenses and other current liabilities — 2 — 5 Total 1 2 — 5 Total $ 107 $ 3 $ 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: March 31, 2018 December 31, 2017 (in millions) 2018 $ 983 $ 1,185 2019 885 720 2020 135 — Total notional value of contracts outstanding $ 2,003 $ 1,905 Net unrealized gains included in accumulated other comprehensive income (loss), net of taxes $ 79 $ 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 on our cash flow hedges for the three months ended March 31 : 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 $ (14 ) $ 124 Cost of revenues $ 30 $ 17 Selling, general and administrative expenses 5 3 Total $ 35 $ 20
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: March 31, 2018 December 31, 2017 Notional Fair Value Notional Fair Value (in millions) Contracts outstanding $ 301 $ (1 ) $ 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 months ended March 31 : Location of Net Gains (Losses) on Derivative Instruments Amount of Net Gains (Losses) on Derivative Instruments 2018 2017 (in millions) Foreign exchange forward contracts – Not designated as hedging instruments Foreign currency exchange gains (losses), net $ 2 $ (10 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2018 : Level 1 Level 2 Level 3 Total (in millions) Cash equivalents: Money market funds $ 335 $ — $ — $ 335 Commercial paper — 248 — 248 Total cash equivalents 335 248 — 583 Short-term investments: Time deposits (1) — 353 — 353 Available-for-sale investment securities: U.S. Treasury and agency debt securities 566 68 — 634 Corporate and other debt securities — 442 — 442 Certificates of deposit and commercial paper — 563 — 563 Asset-backed securities — 302 — 302 Municipal debt securities — 128 — 128 Total available-for-sale investment securities 566 1,503 — 2,069 Held-to-maturity investment securities: Commercial paper — 461 — 461 Corporate and other debt securities — 480 — 480 Total short-term held-to-maturity investment securities — 941 — 941 Total short-term investments (2) 566 2,797 — 3,363 Long-term investments: Held-to-maturity investment securities: Corporate and other debt securities — 6 — 6 Total long-term held-to-maturity investment securities — 6 — 6 Total long-term investments (3) — 6 — 6 Derivative financial instruments - foreign exchange forward contracts: Other current assets — 98 — 98 Accrued expenses and other current liabilities — (2 ) — (2 ) Other noncurrent assets — 9 — 9 Other noncurrent liabilities — (1 ) — (1 ) Total $ 901 $ 3,155 $ — $ 4,056 (1) Includes $348 million in restricted time deposits. See Note 14 . (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 $77 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: Commercial paper — 397 — 397 Corporate and other debt securities — 345 — 345 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)	3 Months Ended
	Mar. 31, 2018
Accelerated Share Repurchases [Line Items]
Accelerated Share Repurchases [Table Text Block]	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 three months ended March 31, 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) March 2018 ASR (1) 3.0 (1) (1) $ 300 December 2017 ASR March 2018 4.0 (2) $ 75.75 $ 300 March 2017 ASR August 2017 23.7 $ 63.19 $ 1,500 ___________________ (1) Under the terms of the March 2018 ASR and in exchange for up-front payments of $300 million , the financial institution initially delivered 3.0 million shares, a portion of the Company's total expected shares to be repurchased under the March 2018 ASR. The total number of shares ultimately delivered, and therefore the average price paid per share, will be determined at the end of the purchase period, which is scheduled to end during the second quarter of 2018, based on the volume-weighted average price of the Company's common stock during that period. (2) 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	ividends on our Class A common stock during the periods presented were as follows: Dividends per Share Amount (in millions) 2018: Three months ended March 31, 2018 $ 0.20 $ 119 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 months ended March 31, 2018 : Three Months Before Tax Amount Tax Effect Net of Tax Amount (in millions) Foreign currency translation adjustments: Beginning balance $ (38 ) $ — $ (38 ) Change in foreign currency translation adjustments 41 (4 ) 37 Ending balance $ 3 $ (4 ) $ (1 ) Unrealized (losses) on available-for-sale investment securities: Beginning balance $ (11 ) $ 4 $ (7 ) Cumulative effect of change in accounting principle (1) — (1 ) (1 ) Net unrealized (losses) arising during the period (9 ) 1 (8 ) Reclassification of net losses to Other, net 1 — 1 Net change (8 ) — (8 ) Ending balance $ (19 ) $ 4 $ (15 ) Unrealized gains on cash flow hedges: Beginning balance $ 154 $ (39 ) $ 115 Unrealized (losses) arising during the period (14 ) 5 (9 ) Reclassifications of net (gains) to: Cost of revenues (30 ) 7 (23 ) Selling, general and administrative expenses (5 ) 1 (4 ) Net change (49 ) 13 (36 ) Ending balance $ 105 $ (26 ) $ 79 Accumulated other comprehensive income (loss): Beginning balance $ 105 $ (35 ) $ 70 Other comprehensive income (loss) (16 ) 9 (7 ) Ending balance $ 89 $ (26 ) $ 63 (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 months ended March 31, 2017 : Three Months Before Tax Amount Tax Effect Net of Tax Amount (in millions) Foreign currency translation adjustments: Beginning balance $ (149 ) $ — $ (149 ) Change in foreign currency translation adjustments 17 — 17 Ending balance $ (132 ) $ — $ (132 ) Unrealized gains on available-for-sale investment securities: Beginning balance $ (6 ) $ 2 $ (4 ) Net unrealized gains arising during the period 2 (1 ) 1 Reclassification of net (gains) to Other, net — — — Net change 2 (1 ) 1 Ending balance $ (4 ) $ 1 $ (3 ) Unrealized gains (losses) on cash flow hedges: Beginning balance $ 51 $ (12 ) $ 39 Unrealized gains arising during the period 124 (30 ) 94 Reclassifications of net (gains) to: Cost of revenues (17 ) 4 (13 ) Selling, general and administrative expenses (3 ) 1 (2 ) Net change 104 (25 ) 79 Ending balance $ 155 $ (37 ) $ 118 Accumulated other comprehensive income (loss): Beginning balance $ (104 ) $ (10 ) $ (114 ) Other comprehensive income (loss) 123 (26 ) 97 Ending balance $ 19 $ (36 ) $ (17 )

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Revenues From External Customers And Segment Operating Profit	Revenues from external customers and segment operating profit, before unallocated expenses, by reportable segment were as follows: Three Months Ended 2018 2017 (in millions) Revenues: Financial Services $ 1,461 $ 1,376 Healthcare 1,121 1,003 Products and Resources 821 737 Communications, Media and Technology 509 430 Total revenues $ 3,912 $ 3,546 Segment Operating Profit: Financial Services $ 447 $ 427 Healthcare 338 274 Products and Resources 256 217 Communications, Media and Technology 159 135 Total segment operating profit 1,200 1,053 Less: unallocated costs 507 483 Income from operations $ 693 $ 570
Revenues And Long-Lived Assets By Geographic Area	Revenue and long-lived assets, by geographic area, are as follows: Three Months Ended 2018 2017 (in millions) Revenues: (1) North America (2) $ 2,975 $ 2,761 United Kingdom 310 274 Rest of Europe 374 285 Europe - Total 684 559 Rest of World (3) 253 226 Total $ 3,912 $ 3,546 As of March 31, 2018 December 31, 2017 (in millions) Long-lived Assets: (4) North America (2) $ 387 $ 360 Europe 66 63 Rest of World (3)(5) 880 901 Total $ 1,333 $ 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 (Tables)

Subsequent Events (Tables)	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Schedule Of Restricted Cash, Cash Equivalents and Investments [Table Text Block]	The following table summarizes total restricted assets that are included in our consolidated statements of financial position as of March 31, 2018: Restricted Assets (in millions) Restricted cash (1) $ 159 Short-term investments (2) 348 Total restricted assets at March 31, 2018 $ 507
Restrictions on Cash and Cash Equivalents [Table Text Block]	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated statements of financial position to the amounts shown in the consolidated statements of cash flows: March 31 2018 2017 (in millions) Cash and cash equivalents $ 1,440 $ 1,308 Restricted cash 159 — Total cash, cash equivalents and restricted cash $ 1,599 $ 1,308
Schedule of Cash and Cash Equivalents [Table Text Block]	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated statements of financial position to the amounts shown in the consolidated statements of cash flows: March 31 2018 2017 (in millions) Cash and cash equivalents $ 1,440 $ 1,308 Restricted cash 159 — Total cash, cash equivalents and restricted cash $ 1,599 $ 1,308

Interim Condensed Consolidate33

Interim Condensed Consolidated Financial Statements (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 159	$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption	(121)
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 Re34

Internal Investigation and Related Matters (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Selling, general and administrative expenses	$ 711	$ 686
Internal Investigation and Related Matters [Member]
Loss Contingencies [Line Items]
Potential Improper Payments	6
Potential Improper Payments Remaining Under Investigation	$ 2
Out of period adjustment [Member] | Internal Investigation and Related Matters [Member]
Loss Contingencies [Line Items]
Selling, general and administrative expenses			$ 4

Revenues - Narrative (Details)

Revenues - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 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	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets:
Trade accounts receivable, net	$ 3,145	$ 2,865
Unbilled accounts receivable	0	357
Other current assets	856	833
Total current assets	8,990	9,111
Other noncurrent assets	577	448
Total assets	15,045	15,221
Liabilities:
Deferred revenue	360	383
Total current liabilities	2,469	2,839
Deferred revenue, noncurrent	70	104
Deferred income tax liabilities, net	113	146
Total liabilities	4,057	4,552
Stockholders’ equity:
Retained earnings	10,856	10,544
Accumulated other comprehensive income (loss)	63	70
Total stockholders’ equity	10,988	10,669	$ 9,983	$ 10,728
Total liabilities and stockholders’ equity	15,045	$ 15,221
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets:
Trade accounts receivable, net	3,015
Unbilled accounts receivable	412
Other current assets	549
Other noncurrent assets	533
Liabilities:
Deferred revenue	471
Deferred revenue, noncurrent	79
Deferred income tax liabilities, net	70
Stockholders’ equity:
Retained earnings	10,712
Accumulated other comprehensive income (loss)	61
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets:
Trade accounts receivable, net	130
Unbilled accounts receivable	(412)
Other current assets	307
Total current assets	25
Other noncurrent assets	44
Total assets	69
Liabilities:
Deferred revenue	(111)
Total current liabilities	(111)
Deferred revenue, noncurrent	(9)
Deferred income tax liabilities, net	43
Total liabilities	(77)
Stockholders’ equity:
Retained earnings	144
Accumulated other comprehensive income (loss)	2
Total stockholders’ equity	146
Total liabilities and stockholders’ equity	$ 69

Revenues - Schedule of Effect37

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
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 3,912	$ 3,546
Cost of revenues	2,401	2,194
Selling, general and administrative expenses	711	686
Depreciation and amortization expense	107	96
Income from operations	693	570
Other income (expense), net	4	79
Income before provision for income taxes	697	649
Provision for income taxes	(177)	(92)
Net income	$ 520	$ 557
Basic earnings per share (usd per share)	$ 0.89	$ 0.92
Diluted earnings per share (usd per share)	$ 0.88	$ 0.92
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 3,891
Cost of revenues	2,409
Selling, general and administrative expenses	711
Depreciation and amortization expense	107
Income from operations	664
Other income (expense), net	4
Income before provision for income taxes	668
Provision for income taxes	(171)
Net income	$ 497
Basic earnings per share (usd per share)	$ 0.85
Diluted earnings per share (usd per share)	$ 0.84
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	$ 21
Cost of revenues	(8)
Selling, general and administrative expenses	0
Depreciation and amortization expense	0
Income from operations	29
Other income (expense), net	0
Income before provision for income taxes	29
Provision for income taxes	(6)
Net income	$ 23
Basic earnings per share (usd per share)	$ 0.04
Diluted earnings per share (usd per share)	$ 0.04

Revenues - Capitalized Costs to

Revenues - Capitalized Costs to Fulfill Contract with Customer (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Capitalized Contract Cost, Net	$ 330	$ 303
Amortization expense	(14)
Costs capitalized	39
Other	$ 2

Revenues - Significant Movement

Revenues - Significant Movements in Contract Assets (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Balance - January 1, 2018	$ 306
Revenues recognized during the period but not billed	225
Amounts reclassified to accounts receivable	(225)
Other	1
Balance - March 31, 2018	$ 307

Revenues - Significant Moveme40

Revenues - Significant Movements in Deferred Revenue Balances (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Balance - January 1, 2018	$ 431
Amounts billed but not recognized as revenues	99
Revenues recognized related to the opening balance of deferred revenue	(100)
Balance - March 31, 2018	$ 430

Revenues - Remaining Performanc

Revenues - Remaining Performance Obligations Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 1,752
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
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) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 3,912
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,058
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,522
Transaction Or Volume-Based [Member]
Disaggregation of Revenue [Line Items]
Revenue	332
North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,975
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	310
Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	374
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	684
Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue	253
Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,268
Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,644
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,461
Financial Services [Member] | Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	935
Financial Services [Member] | Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	471
Financial Services [Member] | Transaction Or Volume-Based [Member]
Disaggregation of Revenue [Line Items]
Revenue	55
Financial Services [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,044
Financial Services [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	116
Financial Services [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	162
Financial Services [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	278
Financial Services [Member] | Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue	139
Financial Services [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	871
Financial Services [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	590
Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,121
Healthcare [Member] | Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	448
Healthcare [Member] | Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	511
Healthcare [Member] | Transaction Or Volume-Based [Member]
Disaggregation of Revenue [Line Items]
Revenue	162
Healthcare [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,023
Healthcare [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	23
Healthcare [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	61
Healthcare [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	84
Healthcare [Member] | Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue	14
Healthcare [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	638
Healthcare [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	483
Products and Resources [Member]
Disaggregation of Revenue [Line Items]
Revenue	821
Products and Resources [Member] | Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	369
Products and Resources [Member] | Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	361
Products and Resources [Member] | Transaction Or Volume-Based [Member]
Disaggregation of Revenue [Line Items]
Revenue	91
Products and Resources [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	572
Products and Resources [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	87
Products and Resources [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	109
Products and Resources [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	196
Products and Resources [Member] | Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue	53
Products and Resources [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	481
Products and Resources [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	340
Communication, Media and Technology [Member]
Disaggregation of Revenue [Line Items]
Revenue	509
Communication, Media and Technology [Member] | Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	306
Communication, Media and Technology [Member] | Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenue	179
Communication, Media and Technology [Member] | Transaction Or Volume-Based [Member]
Disaggregation of Revenue [Line Items]
Revenue	24
Communication, Media and Technology [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Revenue	336
Communication, Media and Technology [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	84
Communication, Media and Technology [Member] | Europe, excluding United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenue	42
Communication, Media and Technology [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue	126
Communication, Media and Technology [Member] | Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue	47
Communication, Media and Technology [Member] | Consulting And Technology Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	278
Communication, Media and Technology [Member] | Outsourcing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 231

Investments (Details)

Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments [Abstract]
Trading securities	$ 25		$ 25
Available-for-sale investment securities	2,069		1,972
Held-to-maturity Securities, Current	943		745
Other Short-term Investments	353		389
Short-term Investments	3,390		3,131
Equity and Cost Method Investments	77		74
Held-to-maturity Securities, Noncurrent	6		161
Long-term Investments	83		$ 235
Trading Securities, Realized Gain (Loss)	$ 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	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Restricted Investments	$ 348
Amortized Cost	2,088	$ 1,983
Unrealized Gains	0	0
Unrealized Losses	(19)	(11)
Available-for-sale securities, current	2,069	1,972
U.S. Treasury And Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	643	667
Unrealized Gains	0	0
Unrealized Losses	(9)	(6)
Available-for-sale securities, current	634	661
Corporate And Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	448	439
Unrealized Gains	0	0
Unrealized Losses	(6)	(2)
Available-for-sale securities, current	442	437
Certificates of Deposit and Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	563	450
Unrealized Gains	0	0
Unrealized Losses	0	0
Available-for-sale securities, current	563	450
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	305	297
Unrealized Gains	0	0
Unrealized Losses	(3)	(2)
Available-for-sale securities, current	302	295
Municipal Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	129	130
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Available-for-sale securities, current	$ 128	$ 129

Investments (Securities In A Co

Investments (Securities In A Continuous Unrealized Loss Position) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Short-term Investments [Table] [Line Items]
Fair Value available-for-sale securities Less than 12 Months	$ 1,568	$ 1,165
Unrealized losses, available-for-sale securities, Less than 12 Months	(15)	(7)
Fair value available-for-sale securities 12 Months or More	306	362
Unrealized losses, available-for-sale securities, 12 Months or More	(4)	(4)
Total Fair Value available-for-sale securities	1,874	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	517	519
Unrealized losses, available-for-sale securities, Less than 12 Months	(7)	(4)
Fair value available-for-sale securities 12 Months or More	94	124
Unrealized losses, available-for-sale securities, 12 Months or More	(2)	(2)
Total Fair Value available-for-sale securities	611	643
Unrealized losses, available-for-sale securities, Total	(9)	(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	331	297
Unrealized losses, available-for-sale securities, Less than 12 Months	(5)	(1)
Fair value available-for-sale securities 12 Months or More	111	126
Unrealized losses, available-for-sale securities, 12 Months or More	(1)	(1)
Total Fair Value available-for-sale securities	442	423
Unrealized losses, available-for-sale securities, Total	(6)	(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	399	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	399	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	214	193
Unrealized losses, available-for-sale securities, Less than 12 Months	(2)	(1)
Fair value available-for-sale securities 12 Months or More	85	94
Unrealized losses, available-for-sale securities, 12 Months or More	(1)	(1)
Total Fair Value available-for-sale securities	299	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	107	107
Unrealized losses, available-for-sale securities, Less than 12 Months	(1)	(1)
Fair value available-for-sale securities 12 Months or More	16	18
Unrealized losses, available-for-sale securities, 12 Months or More	0	0
Total Fair Value available-for-sale securities	123	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	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within one year, available-for-sale	$ 729
Due within one year, held-to-maturity	943
Due after one year up to two years, available-for-sale	500
Due after two years up to three years, available-for-sale	495
Due after two years up to three years, held-to-maturity	6
Due after three years, available-for-sale	59
Asset-backed securities	305
Amortized Cost, available-for-sale	2,088
Amortized Cost, held-to-maturity	949	$ 906
Fair Value
Due within one year, available-for-sale	728
Due within one year, held-to-maturity	941
Due after one year up to two years, available-for-sale	494
Due after two years up to three years, available-for-sale	487
Due after two years up to three years, held-to-maturity	6
Due after three years	58
Asset-backed securities	302
Fair Value, available-for-sale	2,069
Fair Value, held-to-maturity	$ 947	$ 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
	Mar. 31, 2018	Mar. 31, 2017
Investments [Abstract]
Proceeds from sales of available-for-sale investment securities	$ 125	$ 1,248
Gross gains	0	1
Gross losses	(1)	(1)
Net realized gains on sales of available-for-sale investment securities	$ (1)	$ 0

Investments (Schedule of Held-t

Investments (Schedule of Held-to-Maturity Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 943	$ 745
Amortized Cost, Noncurrent	6	161
Unrealized Gains	0	0
Unrealized Losses	(2)	(4)
Fair Value	947	902
Amortized Cost, held-to-maturity	949	906
Less than 12 Months, Fair Value	649	867
Less than 12 Months, Unrealized Losses	(2)	(4)
12 Months or More, Fair Value	32	0
12 Months or More, Unrealized Losses	0	0
Fair Value	681	867
Unrealized Losses	(2)	(4)
Corporate And Other Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 Months, Fair Value	327	473
Less than 12 Months, Unrealized Losses	(1)	(2)
12 Months or More, Fair Value	32	0
12 Months or More, Unrealized Losses	0	0
Fair Value	359	473
Unrealized Losses	(1)	(2)
Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 Months, Fair Value	322	394
Less than 12 Months, Unrealized Losses	(1)	(2)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Fair Value	322	394
Unrealized Losses	(1)	(2)
Short-term Investments [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	943	745
Unrealized Gains	0	0
Unrealized Losses	(2)	(3)
Fair Value	941	742
Short-term Investments [Member] | Corporate And Other Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	481	346
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Fair Value	480	345
Short-term Investments [Member] | Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	462	399
Unrealized Gains	0	0
Unrealized Losses	(1)	(2)
Fair Value	461	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

Accrued Expenses And Other Cu49

Accrued Expenses And Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Compensation and benefits	$ 848	$ 1,272
Income Taxes	74	48
Professional fees	103	100
Travel and entertainment	38	32
Customer volume and other incentives	318	289
Derivative financial instruments	2	5
Other	333	325
Accrued Liabilities and Other Liabilities	$ 1,716	$ 2,071

Debt (Additional Disclosures) (

Debt (Additional Disclosures) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2018	Dec. 31, 2017
Term Loan [Member]
Line of Credit Facility [Line Items]
Principal amount of debt	$ 1,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 750
Period drawn notes have been outstanding	90 days
Notes outstanding under revolving credit facility		$ 0	$ 75

Debt (Short-term Debt) (Details

Debt (Short-term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Total short-term debt	$ 100	$ 175
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	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, net of current maturities	$ 673	$ 698
Term Loan [Member]
Debt Instrument [Line Items]
Term loan, due 2019	775	800
Current maturities	(100)	(100)
Deferred financing costs	(2)	(2)
Long-term debt, net of current maturities	$ 673	$ 698

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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
Incentive period for SEZs, years	15 years
Regular corporate income tax rate in India	34.90%
Current MAT rate	21.50%
Previously unrecognized income tax benefits			$ 72
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

Income Taxes (Schedule Of Effec

Income Taxes (Schedule Of Effective Tax Rate) (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	25.40%	14.20%

Income Taxes (Narrative) (One-t

Income Taxes (Narrative) (One-time Transaction) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	May 31, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2013	Apr. 03, 2018
One-time Transaction [Table] [Line Items]
Income tax expense		$ 177	$ 92
Restricted Investments		348
India Cash Remittance [Member]
One-time Transaction [Table] [Line Items]
India Income Tax Disputed Amount		$ 507
Foreign Earnings Repatriated	$ 2,800
2013 India Share Repurchase [Member]
One-time Transaction [Table] [Line Items]
Foreign Earnings Repatriated					$ 523
INDIA | India Cash Remittance [Member]
One-time Transaction [Table] [Line Items]
Income tax expense				$ 135
Subsequent Event [Member]
One-time Transaction [Table] [Line Items]
Restricted Cash						$ 76
India Income Tax Disputed Amount - Deposited asset percentage						15.00%
Restricted Investments						$ 431

Derivative Financial Instrume56

Derivative Financial Instruments (Location And Fair Values Of Derivative Financial Instruments In Our Consolidated Statement Of Financial Position) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets fair value	$ 107	$ 154
Derivative liabilities fair value	3	5
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	106	154
Derivative liabilities fair value	1	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	97	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	9	20
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	1	0
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	1	0
Derivative liabilities fair value	2	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	1	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	$ 2	$ 5

Derivative Financial Instrume57

Derivative Financial Instruments (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash flow hedge gains expected to be reclassified to earnings within the next 12 months	$ 72
Cash flow hedge ineffectiveness is immaterial	Hedge ineffectiveness was immaterial for all periods presented.

Derivative Financial Instrume58

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	Mar. 31, 2018	Dec. 31, 2017
Foreign Exchange Forward [Member]
Derivative [Line Items]
Net unrealized gains included in accumulated other comprehensive income (loss), net of taxes	$ 79	$ 115
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	2,003	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	983	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	885	720
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2020 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	$ 135	$ 0

Derivative Financial Instrume59

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
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	$ 35	$ 20
Cost Of Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Gains Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	30	17
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)	5	3
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Derivative Gains/Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion)	$ (14)	$ 124

Derivative Financial Instrume60

Derivative Financial Instruments (Other Derivatives) (Details) - Not Designated as Hedging Instrument [Member] - Foreign Exchange Forward [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional	$ 301	$ 255
Market Value	$ (1)	$ (5)

Derivative Financial Instrume61

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
	Mar. 31, 2018	Mar. 31, 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	$ 2	$ (10)

Fair Value Measurements (Financ

Fair Value Measurements (Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	$ 947	$ 902
Trading securities	25	25
Equity and Cost Method Investments	77	74
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	583	800
Time deposits	353	389
Available-for-sale investment securities	2,069	1,972
Total	4,056	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	98	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	(2)	(5)
Recurring [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	9	20
Recurring [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	(1)
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	634	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	442	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	563	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	302	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	128	129
Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	335	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	248	386
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	335	334
Time deposits	0	0
Available-for-sale investment securities	566	585
Total	901	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	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	566	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	335	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	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	248	466
Time deposits	353	389
Available-for-sale investment securities	1,503	1,387
Total	3,155	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	98	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	(2)	(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	9	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	(1)
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	68	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	442	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	563	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	302	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	128	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	248	386
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	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	0
Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities, Fair Value	941	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	461	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	480	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	941	742
Investments	3,363	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	461	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	480	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	566	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	941	742
Investments	2,797	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	461	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	480	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] | 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	6	160
Investments	6	160
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] | 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	6	160
Investments	6	160
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] | 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 Share Repu

Stockholder's Equity Share Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 3,500
Repurchases of common stock, Value	316	$ 1,514
Common Class A [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,400
Share Repurchase Program, Stock-based Compensation Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock, Shares	0.2	0.2
Repurchases of common stock, Value	$ 16	$ 14
Retained Earnings [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock, Value	$ 211	$ 1,100

Stockholder's Equity Accelerate

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

Stockholder's Equity Dividend (

Stockholder's Equity Dividend (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended					12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.20	$ 0.15	$ 0.15	$ 0.15
Payments of Ordinary Dividends, Common Stock	$ 119	$ 89	$ 90	$ 89		$ 268
Dividends declared per common share	$ 0.20				$ 0

Stockholder's Equity Accumulate

Stockholder's Equity Accumulated Other Comprehensive Income (Loss)(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Cumulative effect of changes in accounting principle	$ 121
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI, beginning balance	10,669	$ 10,728
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other comprehensive income (loss)	(6)	97
AOCI, ending balance	10,988	9,983
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	37	17
Foreign currency translation adjustments:
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	41	17
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(38)	(149)
AOCI tax, beginning balance	0	0
AOCI, beginning balance	(38)	(149)
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	4	0
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other comprehensive income (loss)		17
AOCI before tax, ending balance	3	(132)
AOCI tax, ending balance	(4)	0
AOCI, ending balance	(1)	(132)
Unrealized gains on available-for-sale investment securities:
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(8)	2
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(11)	(6)
AOCI tax, beginning balance	4	2
AOCI, beginning balance	(7)	(4)
Other Comprehensive Income (Loss), before Tax [Abstract]
OCI, before reclassifications, before tax	(9)	2
Reclassification from AOCI, current period, before tax	1	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0	1
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	1	(1)
Reclassification from AOCI, current period, tax	0	0
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
OCI, before reclassifications, net of tax	(8)	1
Reclassification from AOCI, current period, net of tax	1	0
Other comprehensive income (loss)	(8)	1
AOCI before tax, ending balance	(19)	(4)
AOCI tax, ending balance	4	1
AOCI, ending balance	(15)	(3)
Unrealized gains (losses) on cash flow hedges:
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(49)	104
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	154	51
AOCI tax, beginning balance	(39)	(12)
AOCI, beginning balance	115	39
Other Comprehensive Income (Loss), before Tax [Abstract]
OCI, before reclassifications, before tax	(14)	124
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(13)	25
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax	5	(30)
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
OCI, before reclassifications, net of tax	(9)	94
Other comprehensive income (loss)	(36)	79
AOCI before tax, ending balance	105	155
AOCI tax, ending balance	(26)	(37)
AOCI, ending balance	79	118
Unrealized gains (losses) on cash flow hedges: | Cost of revenues
Other Comprehensive Income (Loss), before Tax [Abstract]
Reclassification from AOCI, current period, before tax	(30)	(17)
Other Comprehensive Income (Loss), Tax [Abstract]
Reclassification from AOCI, current period, tax	7	4
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Reclassification from AOCI, current period, net of tax	(23)	(13)
Unrealized gains (losses) on cash flow hedges: | Selling, general and administrative expenses
Other Comprehensive Income (Loss), before Tax [Abstract]
Reclassification from AOCI, current period, before tax	(5)	(3)
Other Comprehensive Income (Loss), Tax [Abstract]
Reclassification from AOCI, current period, tax	1	1
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Reclassification from AOCI, current period, net of tax	(4)	(2)
Accumulated other comprehensive income (loss):
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(16)	123
Cumulative Tax Effect Of New Accounting Principle In Period Of Adoption	(1)
Cumulative effect of changes in accounting principle	(1)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	105	(104)
AOCI tax, beginning balance	(35)	(10)
AOCI, beginning balance	70	(114)
Other Comprehensive Income (Loss), before Tax [Abstract]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(9)	26
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other comprehensive income (loss)	(7)	97
AOCI before tax, ending balance	89	19
AOCI tax, ending balance	(26)	(36)
AOCI, ending balance	$ 63	$ (17)

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	$ 711	$ 686
Insurance Receivable for Malpractice	1
Internal Investigation and Related Matters [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Potential Improper Payments	6
Potential Improper Payments Remaining Under Investigation	$ 2
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

Related Party Transactions (Det

Related Party Transactions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Related Party Transactions [Abstract]
Related Party Transaction, Purchases from Related Party	$ 2

Segment Information (Revenues F

Segment Information (Revenues From External Customers And Segment Operating Profit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 3,912	$ 3,546
Income from operations	693	570
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	3,912	3,546
Income from operations	1,200	1,053
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Revenues	1,461	1,376
Income from operations	447	427
Operating Segments [Member] | Healthcare [Member]
Segment Reporting Information [Line Items]
Revenues	1,121	1,003
Income from operations	338	274
Operating Segments [Member] | Products and Resources [Member]
Segment Reporting Information [Line Items]
Revenues	821	737
Income from operations	256	217
Operating Segments [Member] | Communications, Media and Technology [Member]
Segment Reporting Information [Line Items]
Revenues	509	430
Income from operations	159	135
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated costs	$ 507	$ 483

Segment Information (Revenues A

Segment Information (Revenues And Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 3,912	$ 3,546
Long-lived Assets	1,333		$ 1,324
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,975	2,761
Long-lived Assets	387		360
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	684	559
Long-lived Assets	66		63
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	310	274
Europe, excluding United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	374	285
Other Regions [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	253	$ 226
Long-lived Assets	$ 880		$ 901

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	May 04, 2018	Apr. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Apr. 03, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Dividends declared per common share			$ 0.20	$ 0
Cash and cash equivalents			$ 1,440	$ 1,308		$ 1,925	$ 2,034
Restricted Cash			159	0
Restricted Investments			348
Restricted Cash and Investments, Current			507
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents			1,599	$ 1,308
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared per common share	$ 0.20
Restricted Investments					$ 431
Business Combination, Consideration Transferred		$ 477
15% of disputed tax amount [Member]
Subsequent Event [Line Items]
Restricted Cash			76
Subsequent time deposit [Member]
Subsequent Event [Line Items]
Restricted Cash			$ 83