Restructuring Charges/Other - Restructuring Reserve (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Restructuring Reserve
Accrual, beginning				$ 57
Restructuring charges		$ 0	$ (4)	(1)	[1]	$ 22
Payments				(24)
Remaining accrual, ending		32		32
2013 Actions
Restructuring Reserve
Restructuring charges	[1]	0	(4)	(1)		28
2013 Actions | Severance and benefits cost
Restructuring Reserve
Accrual, beginning				22
Restructuring charges	[1]			(1)
Payments				(8)
Remaining accrual, ending		13		13
2013 Actions | Other Charges
Restructuring Reserve
Accrual, beginning				9
Restructuring charges	[1]			0
Payments				(3)
Remaining accrual, ending		6		6
Prior Actions
Restructuring Reserve
Restructuring charges	[1]	0	$ 0	0		$ (6)
Prior Actions | Severance and benefits cost
Restructuring Reserve
Accrual, beginning				26
Restructuring charges	[1]			0
Payments				(13)
Remaining accrual, ending		$ 13		$ 13

[1] Includes changes in estimates.