Defined Benefit Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Pension and Other Postretirement Benefit Contributions [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax					$ 103
Pension Contributions					162
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	2				2
Defined Benefit Plan, Benefits Paid					7
Other Postretirement Benefits Payments					12
United States and Foreign Pension Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service cost	12		12		37		35
Interest cost	16		17		48		50
Expected return on plan assets	(14)		(16)		(46)		(49)
Amortization:
- prior service cost (credit)	2		1		6		4
-actuarial loss (gain)	12		12		37		37
net settlement loss	34	[1]	0	[1]	34	[1]	0	[1]
Net periodic benefit cost	62		26		116		77
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service cost	1		1		3		3
Interest cost	4		4		11		12
Expected return on plan assets	0		0		0		0
Amortization:
- prior service cost (credit)	(2)		(2)		(5)		(5)
-actuarial loss (gain)	0		0		0		0
net settlement loss	0	[1]	0	[1]	0	[1]	0	[1]
Net periodic benefit cost	$ 3		$ 3		$ 9		$ 10

[1] Settlement losses are recorded when lump sum payments from a plan in a period exceed the plan's total service and interest costs for the period. Such settlements occurred in our U.S. pension plans during the third quarter of 2012