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Pensions, Other Post-employment Benefits and 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
Pension Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 7 $ 7 $ 14 $ 14
Interest Cost 20 20 41 42
Expected return on plan assets (16) (17) (32) (34)
Amortization of actuarial losses 9 7 19 13
Amortization of prior service credit 0 0 0 0
Settlement gain     (1) 0
Net periodic benefit cost 20 17 41 35
Other Post-Employement Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0 0 0 0
Interest Cost 4 5 8 10
Expected return on plan assets 0 0 0 0
Amortization of actuarial losses 0 0 0 0
Amortization of prior service credit (4) (4) (8) (8)
Settlement gain     0 0
Net periodic benefit cost $ 0 $ 1 $ 0 $ 2