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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Federal income tax provision at statutory rate $ 343 $ 394 $ 403
State taxes, net of federal benefit 20 36 4
Research and development credits (38) (46) (26)
Foreign rate differential (104) (198) (271)
Change in tax reserves 96 285 291
Acquired net operating loss utilization 0 0 (36)
Audit settlements 54 (115) 0
Excess tax benefits related to share-based payments (2) (58) (113)
U.S. Tax Reform Act 0 (340) 636
Change in valuation allowance 11 61 0
Intra-entity IP Transfer (230) 0 0
Other (20) 10 (10)
Income tax expense $ 130 $ 29 $ 878
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal income tax provision at statutory rate 21.00% 21.00% 35.00%
State taxes, net of federal benefit 1.00% 2.00% 0.00%
Research and development credits (2.00%) (2.00%) (2.00%)
Foreign rate differential (7.00%) (11.00%) (24.00%)
Change in tax reserves 6.00% 15.00% 25.00%
Acquired net operating loss utilization 0.00% 0.00% (3.00%)
Audit settlements 3.00% (6.00%) 0.00%
Excess tax benefits related to share-based payments 0.00% (3.00%) (10.00%)
U.S. Tax Reform Act 0 (0.18) 0.55
Change in valuation allowance 1.00% 3.00% 0.00%
Intra-entity IP Transfer (14.00%) 0.00% 0.00%
Other (1.00%) 1.00% 0.00%
Income tax expense 8.00% 2.00% 76.00%