Income Taxes - Schedule of Provision for Income Taxes on Income from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 45	$ 0	$ 0
Foreign	138	98	133
State and local	4	(2)	1
Current provision for income taxes, total	187	96	134
Deferred:
Federal	146	489	1,208
Foreign	(94)	37	136
State and local	(13)	(78)	(2)
Deferred provision for income taxes, total	39	448	1,342
Total	$ 226	$ 544	$ 1,476