Income Tax (Provision for Income Tax from Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S. federal	$ (207)	$ (246)	$ 520
U.S. state and local	11	5	3
Non-U.S.	932	891	628
Subtotal	736	650	1,151
Deferred:
U.S. federal	342	(2,373)	(827)
Non-U.S.	101	253	369
Subtotal	443	(2,120)	(458)
Current and Deferred:
Provision for income tax expense (benefit)	$ 1,179	$ (1,470)	$ 693