Income Tax (Provision for Income Tax from Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. federal	$ (189)	$ (207)	$ (246)
U.S. state and local	4	11	5
Non-U.S.	850	932	891
Subtotal	665	736	650
Deferred:
U.S. federal	(235)	342	(2,373)
Non-U.S.	456	101	253
Subtotal	221	443	(2,120)
Current and Deferred:
Provision for income tax expense (benefit)	$ 886	$ 1,179	$ (1,470)