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Revenue Recognition - Impacts of ASC 606 on Consolidated Statement of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:                      
Net income $ 286 $ 227 $ 251 $ 423 $ 546 $ 232 $ 221 $ 247 $ 1,187 $ 1,246 $ 930
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:                      
Depreciation and other amortization                 393 285 263
Amortization of acquisition-related intangible assets                 163 159 158
Share-based compensation                 73 63 68
Deferred income taxes                 133 (247) 21
(Gain) loss on sale of business 0 $ 2 $ 3 (232) 0 $ 0 $ (10) 0 (227) (10) 0
Loss on early debt extinguishment                 14 0 0
Income from investments in unconsolidated affiliates                 (10) (32) (147)
Dividends from unconsolidated affiliates                 2 45 151
Non-cash impairment charges                 3 18 17
Other operating activities                 (10) (4) (2)
Changes in assets and liabilities, net of effects from acquisitions and dispositions:                      
Trade accounts receivable                 (108) (75) (88)
Prepaid expenses and other assets                 (6) (37) (64)
Contract costs                 (137) (29) (14)
Accounts payable and other liabilities                 116 54 172
Contract liabilities                 (34) 61 17
Net cash provided by operating activities from continuing operations                 1,552 1,483 1,431
Cash flows from investing activities:                      
Capital expenditures, including capitalization of software costs                 (360) (287) (290)
Proceeds from sale of businesses                 419 17 0
Payments for acquisitions of businesses, net of cash acquired                 (712) (384) (265)
Purchases of investments                 (3) (10) (1)
Other investing activities                 (7) 7 2
Net cash used in investing activities from continuing operations                 (663) (657) (554)
Cash flows from financing activities:                      
Debt proceeds                 5,039 2,310 2,126
Debt repayments, including redemption and other costs                 (4,005)    
Proceeds from issuance of treasury stock                 75 78 79
Purchases of treasury stock, including employee shares withheld for tax obligations                 (1,946)    
Other financing activities                 (5) 0 0
Net cash used in financing activities from continuing operations                 (842) (820) (852)
Net change in cash and cash equivalents from continuing operations                 47 6 25
Net change in cash and cash equivalents from discontinued operations                 43 19 0
Cash and cash equivalents, beginning balance       325       $ 300 325 300 275
Cash and cash equivalents, ending balance 415       325       415 325 300
Discontinued operations cash flow information:                      
Net cash (used in) provided by operating activities                 (7) 19 0
Net cash provided by investing activities                 50 0 0
Net change in cash and cash equivalents from discontinued operations                 43 19 $ 0
Adjustments | Accounting Standards Update 2014-09                      
Cash flows from operating activities:                      
Net income                 (51)    
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:                      
Depreciation and other amortization                 (74)    
Amortization of acquisition-related intangible assets                 0    
Share-based compensation                 0    
Deferred income taxes                 (14)    
(Gain) loss on sale of business                 (3)    
Loss on early debt extinguishment                 0    
Income from investments in unconsolidated affiliates                 0    
Dividends from unconsolidated affiliates                 0    
Non-cash impairment charges                 0    
Other operating activities                 0    
Changes in assets and liabilities, net of effects from acquisitions and dispositions:                      
Trade accounts receivable                 31    
Prepaid expenses and other assets                 (2)    
Contract costs                 98    
Accounts payable and other liabilities                 (4)    
Contract liabilities                 19    
Net cash provided by operating activities from continuing operations                 0    
Cash flows from investing activities:                      
Capital expenditures, including capitalization of software costs                 0    
Proceeds from sale of businesses                 0    
Payments for acquisitions of businesses, net of cash acquired                 0    
Purchases of investments                 0    
Other investing activities                 0    
Net cash used in investing activities from continuing operations                 0    
Cash flows from financing activities:                      
Debt proceeds                 0    
Debt repayments, including redemption and other costs                 0    
Proceeds from issuance of treasury stock                 0    
Purchases of treasury stock, including employee shares withheld for tax obligations                 0    
Other financing activities                 0    
Net cash used in financing activities from continuing operations                 0    
Net change in cash and cash equivalents from continuing operations                 0    
Net change in cash and cash equivalents from discontinued operations                 0    
Cash and cash equivalents, beginning balance       0         0    
Cash and cash equivalents, ending balance 0       0       0 0  
Discontinued operations cash flow information:                      
Net cash (used in) provided by operating activities                 0    
Net cash provided by investing activities                 0    
Net change in cash and cash equivalents from discontinued operations                 0    
Balances without adoption of ASC 606                      
Cash flows from operating activities:                      
Net income                 1,136    
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:                      
Depreciation and other amortization                 319    
Amortization of acquisition-related intangible assets                 163    
Share-based compensation                 73    
Deferred income taxes                 119    
(Gain) loss on sale of business                 (230)    
Loss on early debt extinguishment                 14    
Income from investments in unconsolidated affiliates                 (10)    
Dividends from unconsolidated affiliates                 2    
Non-cash impairment charges                 3    
Other operating activities                 (10)    
Changes in assets and liabilities, net of effects from acquisitions and dispositions:                      
Trade accounts receivable                 (77)    
Prepaid expenses and other assets                 (8)    
Contract costs                 (39)    
Accounts payable and other liabilities                 112    
Contract liabilities                 (15)    
Net cash provided by operating activities from continuing operations                 1,552    
Cash flows from investing activities:                      
Capital expenditures, including capitalization of software costs                 (360)    
Proceeds from sale of businesses                 419    
Payments for acquisitions of businesses, net of cash acquired                 (712)    
Purchases of investments                 (3)    
Other investing activities                 (7)    
Net cash used in investing activities from continuing operations                 (663)    
Cash flows from financing activities:                      
Debt proceeds                 5,039    
Debt repayments, including redemption and other costs                 (4,005)    
Proceeds from issuance of treasury stock                 75    
Purchases of treasury stock, including employee shares withheld for tax obligations                 (1,946)    
Other financing activities                 (5)    
Net cash used in financing activities from continuing operations                 (842)    
Net change in cash and cash equivalents from continuing operations                 47    
Net change in cash and cash equivalents from discontinued operations                 43    
Cash and cash equivalents, beginning balance       $ 325         325    
Cash and cash equivalents, ending balance $ 415       $ 325       415 $ 325  
Discontinued operations cash flow information:                      
Net cash (used in) provided by operating activities                 (7)    
Net cash provided by investing activities                 50    
Net change in cash and cash equivalents from discontinued operations                 $ 43