Employee Benefit Plans (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	$ 0	$ 0	$ 0	$ 0
Defined Benefit Plan, Interest Cost	242	246	484	492
Defined Benefit Plan, Expected Return on Plan Assets	(181)	(170)	(362)	(339)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	14	12	28	24
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements	0	4	0	6
Defined Benefit Plan, Net Periodic Benefit Cost	75	92	150	183
Other Postretirement and Postemployment Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	13	15	26	30
Defined Benefit Plan, Interest Cost	45	49	90	98
Defined Benefit Plan, Expected Return on Plan Assets	(22)	(23)	(45)	(46)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1)	(1)	(1)	(2)
Defined Benefit Plan, Actuarial Net (Gains) Losses	(3)	(1)	(6)	(2)
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	$ 32	$ 39	$ 64	$ 78