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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, 2014
Mar. 31, 2013
Pension Benefits
    
Net Periodic Benefit Cost [Line Items]    
Service cost $ 4 $ 4
Interest cost 19 18
Expected return on plan assets (18) (17)
Amortization of actuarial losses 2 6
Amortization of prior service credit 0 0
Net periodic benefit cost 7 11
OPEB
    
Net Periodic Benefit Cost [Line Items]    
Service cost 0 0
Interest cost 3 4
Expected return on plan assets 0 0
Amortization of actuarial losses 1 2
Amortization of prior service credit (1) (3)
Net periodic benefit cost $ 3 $ 3