Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Reduction in current income tax payable attributable to stock-based compensation	$ 60	$ 34	$ 100
Valuation allowance	77	$ 80
Increase (decrease) in NOL valuation allowance	(3)
Undistributed earnings of foreign subsidiaries	$ 85
Effective interest rate of federal statutory income tax rate	21.00%	21.00%	35.00%
Unrecognized tax benefits	$ 305	$ 293	$ 261	$ 220
Unrecognized tax benefits that would impact effective tax rate	188	180	155
Uncertain tax positions, interest and penalties	37	30
Interest and penalties	8	$ 8	$ 7
Increase in prior years taxable revenue due to tax examination	696
Additional federal tax expense due to tax examination	244
Federal
Income Taxes [Line Items]
Net operating loss carryforwards	77
Unrecognized deferred tax liability related to the U.S. federal income tax consequences of undistributed earnings of foreign subsidiaries	18
State
Income Taxes [Line Items]
Net operating loss carryforwards	80
Foreign
Income Taxes [Line Items]
Net operating loss carryforwards	538
Indefinite foreign net operating loss carryforwards	176
Foreign net operating loss carryforwards subject to expiration	$ 362