Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. federal
Current	$ (623)	$ (817)	$ 748
Deferred	(1,558)	(580)	1,330
State and local
Current	(15)	(187)	336
Deferred	(121)	(109)	36
Total United States	(2,317)	(1,693)	2,450
International
Current	2,744	2,997	9,235
Deferred	(2,156)	(1,172)	207
Total International	588	1,825	9,442
Total income tax expense (benefit)	$ (1,729)	$ 132	$ 11,892