Employee Benefit 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
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net benefit cost	$ 50	$ 62	$ 128	$ 166
Threshold Percentage of Active Participants for Amortization Period Change			10.00%
Document Period End Date			Sep. 30, 2012
Discretionary Contribution To Pension Plan	500		500
Total Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	3	3	10	11
Interest cost	64	69	181	205
Expected return on plan assets	(54)	(67)	(158)	(200)
Settlement charge	1	1	1	2
Prior service cost (benefit)	4	2	6	4
Actuarial loss	32	54	88	144
Net benefit cost	50	62	128	166
U.S. Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0	0	0
Interest cost	41	45	119	136
Expected return on plan assets	(30)	(39)	(86)	(117)
Settlement charge	0	0	0	0
Prior service cost (benefit)	0	0	0	0
Actuarial loss	16	34	42	92
Net benefit cost	27	40	75	111
Defined Benefit Plan, Contributions by Employer	515		542
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	542		542
Executive Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Contributions by Employer	2		6
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	4		4
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	3	10	11
Interest cost	23	24	62	69
Expected return on plan assets	(24)	(28)	(72)	(83)
Settlement charge	1	1	1	2
Prior service cost (benefit)	4	2	6	4
Actuarial loss	16	20	46	52
Net benefit cost	23	22	53	55
Defined Benefit Plan, Contributions by Employer	17		56
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	64		64
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	0	0	1	1
Prior service cost (benefit)	(4)	(4)	(13)	(13)
Actuarial loss	0	0	2	2
Net benefit cost	(4)	(4)	(10)	(10)
Defined Benefit Plan, Contributions by Employer	1		4
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	3		3
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	5	16	18
Interest cost	3	3	8	8
Prior service cost (benefit)	(2)	(1)	(5)	(8)
Actuarial loss	2	4	8	11
Net benefit cost	8	11	27	29
Restructuring severance cost	0	6	(1)	6
Net benefit cost	8	17	26	35
Benefit For Reduction In Actuarial Liability		6
Defined Benefit Plan, Contributions by Employer	12		25
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	35		35
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 60		$ 60