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Employee Benefits (Details) (Pension Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
     
Net pension and post retirement benefit cost for all funded and unfunded plans      
Service cost of benefits earned     $ 50
Interest cost on PBO/APBO 57 60 58
Expected return on plan assets (81) (72) (65)
Amortization of prior service cost     1
Amortization of losses 11 12 42
Curtailment loss (gain)     5
Net pension/postretirement benefit cost (13) 0 91
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Prior service cost due to curtailment     (5)
Net loss (gain) 120 54 28
Prior service cost (benefit)     (1)
Amortization of losses (11) (12) (42)
Total recognized in comprehensive income 109 42 (20)
Total recognized in net pension cost and comprehensive income 96 42 71
Changes in PBO related to pension plans      
PBO/APBO at beginning of year 1,250 1,202  
Interest cost 57 60 58
Actuarial losses (gains) 9 79  
Benefit payments (88) (91)  
PBO/APBO at end of year $ 1,228 $ 1,250 $ 1,202