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Pensions, Other Post-employment Benefits and Employee Benefit Plans Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension Benefits
    
Net Periodic Benefit Cost [Line Items]    
Service cost $ 4 $ 7
Interest cost 18 21
Expected return on plan assets (17) (16)
Amortization of actuarial losses 6 10
Amortization of prior service credit 0 0
Settlement gain 0 (1)
Net periodic benefit cost 11 21
OPEB
    
Net Periodic Benefit Cost [Line Items]    
Service cost 0 0
Interest cost 4 4
Expected return on plan assets 0 0
Amortization of actuarial losses 2 0
Amortization of prior service credit (3) (4)
Settlement gain 0 0
Net periodic benefit cost $ 3 $ 0