Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 0	$ 0	$ 0	$ 0
Defined Benefit Plan, Interest Cost	232	242	464	484
Defined Benefit Plan, Expected Return on Plan Assets	(176)	(181)	(352)	(362)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	36	14	72	28
Defined Benefit Plan, Other Costs	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	92	75	184	150
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	14	13	29	26
Defined Benefit Plan, Interest Cost	41	45	82	90
Defined Benefit Plan, Expected Return on Plan Assets	(19)	(22)	(38)	(45)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(6)	(1)	(9)	(1)
Defined Benefit Plan, Amortization of Gains (Losses)	6	(3)	12	(6)
Defined Benefit Plan, Other Costs	104	0	104	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 140	$ 32	$ 180	$ 64