Defined Benefit Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Pension and Other Postretirement Benefit Contributions [Abstract]
Pension Contributions					$ 94
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year					24
Defined Benefit Plan, Benefits Paid					83
Other Postretirement Benefits Payments					11
United States and Foreign Pension Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service cost	12		12		35		38
Interest cost	15		16		46		47
Expected return on plan assets	(16)		(17)		(48)		(50)
Amortization:
- prior service cost (credit)	1		2		4		5
-actuarial loss (gain)	7		9		23		38
Net settlement loss	22	[1]	15	[1]	93	[1]	32	[1]
Net periodic benefit cost	41		37		153		110
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(10)		24		22		163
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service cost	0		1		2		3
Interest cost	4		3		10		9
Expected return on plan assets	0		0		0		0
Amortization:
- prior service cost (credit)	(1)		(2)		(3)		(5)
-actuarial loss (gain)	0		0		0		0
Net settlement loss	0		0		0		0
Net periodic benefit cost	$ 3		$ 2		$ 9		$ 7

[1] Settlements are recognized as they occur, once it is probable that lump sum payments from a plan for a given year will exceed the plan's total service and interest cost for that year.