Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
U.S. statutory income tax rate		35.00%	35.00%	35.00%
Additional tax expense		$ 773,000,000
Increase in effective tax rate		12.70%
Non-U.S. earnings, Increase in income tax expense		$ 714,000,000
Remeasurement of deferred tax balance		59,000,000
Unrecognized deferred tax liabilities		0
Increase (decrease) in valuation allowance balances		37,000,000	$ (58,000,000)
Net income impacted due to change in valuation allowances		0	63,000,000
Tax loss carryforward, U.S. and non-U.S.		6,000,000
Tax loss carryforward, U.S. and non-U.S., set to expire		0
Cash payments for income taxes		1,800,000,000	1,150,000,000	$ 1,170,000,000
Liabilities for uncertain tax positions		300,000,000	243,000,000	$ 84,000,000	$ 108,000,000
Amount of deferred tax assets possibly to be realized		$ 13,000,000	$ 12,000,000
Scenario, Forecast
Income Tax Disclosure [Line Items]
U.S. statutory income tax rate	21.00%