Income Tax (Provision for Income Tax from Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. federal	$ 271	$ (189)	$ (207)
U.S. state and local	27	4	11
Non-U.S.	882	850	932
Subtotal	1,180	665	736
Deferred:
U.S. federal	(115)	(235)	342
U.S. state and local	1	0	0
Non-U.S.	443	456	101
Subtotal	329	221	443
Current and Deferred:
Provision for income tax expense (benefit)	$ 1,509	$ 886	$ 1,179