Reorganization of Businesses (Reorganization of Businesses Accruals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Accruals at January 1	$ 60	$ 57	$ 109
Additional Charges	125	84	100
Adjustments	(5)	(10)	(4)
Amount Used	(79)	(71)	(148)
Accruals at December 31	101	60	57
Exit costs
Restructuring Reserve [Roll Forward]
Accruals at January 1	9	0	6
Additional Charges	5	10	7
Adjustments	(1)	0	0
Amount Used	(6)	(1)	(13)
Accruals at December 31	7	9	0
Employee separation costs
Restructuring Reserve [Roll Forward]
Accruals at January 1	51	57	103
Additional Charges	120	74	93
Adjustments	(4)	(10)	(4)
Amount Used	(73)	(70)	(135)
Accruals at December 31	$ 94	$ 51	$ 57