Income Taxes - Income (Loss) Before Income Taxes and Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income before income tax expense:
Domestic	$ 328	$ 432	$ 185
Foreign	1,305	1,445	966
Income before income tax expense	1,633	1,877	1,151
Current:
Federal	136	(208)	696
State	24	(15)	26
Foreign	323	280	335
Total current	483	57	1,057
Deferred:
Federal	781	(153)	(111)
State	(16)	106	(32)
Foreign	(1,118)	19	(36)
Total deferred	(353)	(28)	(179)
Income tax expense	$ 130	$ 29	$ 878