Reorganization of Businesses (Reorganization of Businesses Accruals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Accruals at beginning of year	$ 57	$ 109	$ 35
Additional Charges	84	100	149
Adjustments	(10)	(4)	(16)
Amount Used	(71)	(148)	(59)
Accruals at end of year	60	57	109
Exit costs
Restructuring Reserve [Roll Forward]
Accruals at beginning of year	0	6	4
Additional Charges	10	7	3
Adjustments	0	0	0
Amount Used	(1)	(13)	(1)
Accruals at end of year	9	0	6
Employee separation costs
Restructuring Reserve [Roll Forward]
Accruals at beginning of year	57	103	31
Additional Charges	74	93	146
Adjustments	(10)	(4)	(16)
Amount Used	(70)	(135)	(58)
Accruals at end of year	$ 51	$ 57	$ 103