Income Taxes - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. federal statutory rate		21.00%				21.00%	35.00%	35.00%
Tax charge to recognize tax reform legislation		$ 186
Other tax benefits						$ 44
Reversal of a provision for an uncertain tax position						11
Benefit related to repatriations from non-U.S. operations						7		$ 58
Tax expense (benefit) related to settlements						$ 5
Effect of change in corporate tax rate						1.00%	49.00%	4.00%
Foreign tax credits		49	$ 49				$ 49
Foreign tax credit valuation allowance		49	49				49
Income tax expense (benefit)						$ 78	283	$ (424)
Expense related to repatriations from non-U.S. operations							2
Withholding taxes paid						11	7	6
Unrecognized tax liability associated with operations in which we are permanently reinvested	$ 11					11
Intercompany loan obligations	1,040					1,040
Intercompany loan obligations to parent considered permanently invested	21					21
Valuation allowance	281	301	301			281	301
Capital loss carryforwards	40	43	43			40	43
Capital loss carryforward valuation allowance	40					40
Other tax credit carryforwards	232					232
Other tax credit carryforward, valuation allowance	95					95
Interest accrued on uncertain tax positions	11	$ 11	11			11	11
Decrease related to prior years tax positions						15	25	1
Decrease in unrecognized tax benefits reasonably possible in next twelve months	16					16
Unrecognized tax benefit that would impact effective tax rate	86					86
Internal Revenue Service (IRS) [Member]
Operating loss carryforwards	362					362
Operating loss carryforwards subjected to limitation, annual limit	$ 84					84
UNITED STATES
Change in valuation allowance			27	$ 501		$ 5	27
Income tax expense (benefit)			$ (27)	(501)
Valuation allowance				137				$ 137
Decrease related to prior years tax positions							$ 23
BRAZIL
Change in valuation allowance				(25)
Income tax expense (benefit)				$ 25
Scenario, Forecast [Member] | BRAZIL
Change in valuation allowance					$ 24
Maximum [Member]
Transition tax rate		15.50%
Other tax credit carryforward periods	20 years
Minimum [Member]
Transition tax rate		8.00%
Other tax credit carryforward periods	10 years