Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal - Current	$ 1,646	$ 1,716	$ 8,817
Federal - Deferred	(843)	324	(123)
Federal Income Tax Expense (Benefit), Continuing Operations	803	2,040	8,694
State - Current	135	162	97
State - Deferred	(42)	(17)	(20)
State and Local Income Tax Expense (Benefit), Continuing Operations	93	145	77
Foreign - Current	124	175	54
Foreign - Deferred	(1,224)	(21)	60
Foreign Income Tax Expense (Benefit), Continuing Operations	(1,100)	154	114
Provision for Income Taxes	$ (204)	$ 2,339	$ 8,885