Other (Income) Expense - Net (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
(Gain) loss on sale and revaluation of assets			$ (130)	$ (572)	$ (351)
(Gain) Loss on Extinguishment of Debt	$ 189		0	189	0
(Gain) Loss on derivatives		$ 102	0	0	102
Other Nonoperating (Income) Expense			(17)	33	(24)
Other (income) expense - net			$ (147)	$ (350)	$ (273)