Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net benefit cost	$ 39	$ 53		$ 78	$ 104
Threshold Percentage of Active Participants for Amortization Period Change				10.00%
Total Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	4		7	8
Interest cost	59	69		117	136
Expected return on plan assets	(52)	(67)		(104)	(133)
Settlement charge	0	1		0	1
Prior service cost (benefit)	1	1		2	2
Actuarial loss	28	45		56	90
Net benefit cost	39		53	78	104
U.S. Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0		0	0
Interest cost	39	46		78	91
Expected return on plan assets	(28)	(39)		(56)	(78)
Settlement charge	0	0		0	0
Prior service cost (benefit)	0	0		0	0
Actuarial loss	13	29		26	58
Net benefit cost	24	36		48	71
Defined Benefit Plan, Contributions by Employer	27			27
Executive Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Contributions by Employer	2			4
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	6			6
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	10			10
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	4		7	8
Interest cost	20	23		39	45
Expected return on plan assets	(24)	(28)		(48)	(55)
Settlement charge	0	1		0	1
Prior service cost (benefit)	1	1		2	2
Actuarial loss	15	16		30	32
Net benefit cost	15	17		30	33
Defined Benefit Plan, Contributions by Employer	23			39
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	81			81
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	120			120
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	1	1		1	1
Prior service cost (benefit)	(5)	(5)		(9)	(9)
Actuarial loss	1	1		2	2
Net benefit cost	(3)	(3)		(6)	(6)
Defined Benefit Plan, Contributions by Employer	1			3
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	4			4
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	7			7
Postemployment Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	5	7		11	13
Interest cost	3	2		5	5
Prior service cost (benefit)	(1)	(7)		(3)	(7)
Actuarial loss	3	4		6	7
Net benefit cost	10	6		19	18
Restructuring severance cost	0	0		(1)	0
Net benefit cost	10	6		18	18
Benefit For Reduction In Actuarial Liability		6
Defined Benefit Plan, Contributions by Employer	5			13
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	47			47
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 60			$ 60