Income Taxes (Details 1) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal
Current	$ (9,000,000)	$ (718,000,000)	$ 188,000,000
Deferred	(1,634,000,000)	(1,443,000,000)	365,000,000
Foreign
Current	393,000,000	745,000,000	2,846,000,000
Deferred	(519,000,000)	(1,315,000,000)	252,000,000
State and local
Current	(135,000,000)	8,000,000	46,000,000
Deferred	(67,000,000)	(145,000,000)	(114,000,000)
Provision for income taxes	$ (1,971,000,000)	$ (2,868,000,000)	$ 3,583,000,000