Income Taxes - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit)	$ 272	$ 272		$ 59
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit), one-time transition tax				16
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit), charge to record valuation allowance on U.S. foreign tax credits				$ 43
Percentage of temporary tax differences that reverse within the carryforward period			27.00%
Percentage of deferred tax asset exclusive of reversing temporary differences			73.00%
Changes in valuation allowances			(14.20%)	0.90%	137.90%
Deferred tax asset, increase (decrease), amount, foreign tax credit				$ 46	$ 9
Deferred tax assets, tax credit carryforwards, foreign, expired during period			$ 88	8	57
Deduction of foreign taxes			113
Deferred tax assets, valuation allowance, foreign tax credit			216
Valuation allowance, amount released			13	10
Valuation allowance	2,584	2,584	2,256	2,486	2,584	$ 1,940
Increase (decrease) to valuation allowance			37	136	$ 831
Valuation allowance, changes due to losses no longer supported by temporary differences				20
Deferred tax assets, other			$ 52	$ 94
Percentage of the effect of unrecognized tax benefit, if recorded			13.00%	5.00%	15.00%
Interest or penalties recognized			$ 6	$ 22	$ 1
Income related to accrued interest and penalties			0	1	2
Amount accrued for payment of interest and penalties	$ 2	$ 2	23	21	2
Foreign Tax Authority
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance				61	$ 675
Tax Authority, Spain | Foreign Tax Authority
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance				92
Other Net State Deferred Tax Asset
Income Tax Contingency [Line Items]
Valuation allowance				$ 672
Capital Loss Carryforward
Income Tax Contingency [Line Items]
Valuation allowance, amount released			$ 10