v2.4.0.8
Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost $ 7 $ 6
Defined Benefit Plan, Interest Cost 27 23
Defined Benefit Plan, Expected Return on Plan Assets (43) (44)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0
Defined Benefit Plan, Amortization of Net Gains (Losses) 0 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 (3)
Defined Benefit Plan, Net Periodic Benefit Cost (9) (18)
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost 0 0
Defined Benefit Plan, Interest Cost 7 5
Defined Benefit Plan, Expected Return on Plan Assets (6) (5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1) 0
Defined Benefit Plan, Amortization of Net Gains (Losses) 0 1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0
Defined Benefit Plan, Net Periodic Benefit Cost $ 0 $ 1