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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Benefits
        
Net Periodic Benefit Cost [Line Items]        
Service cost $ 4 $ 4 $ 8 $ 8
Interest cost 19 17 38 35
Expected return on plan assets (19) (18) (37) (35)
Amortization of actuarial losses 4 7 6 13
Amortization of prior service credit 0 0 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 0 0 0 0
Net periodic benefit cost 8 10 15 21
OPEB
        
Net Periodic Benefit Cost [Line Items]        
Service cost 0 0 0 0
Interest cost 5 4 8 8
Expected return on plan assets 0 0 0 0
Amortization of actuarial losses 0 1 1 3
Amortization of prior service credit (1) (3) (2) (6)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 0 (19) 0 (19)
Net periodic benefit cost 4 (17) 7 (14)
Automotive Segment [Member] | OPEB
        
Net Periodic Benefit Cost [Line Items]        
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments   $ (19)