v2.4.0.6
Risk Management Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]      
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (13)   $ 7
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 34   51
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (178)   (177)
Accumulated Other Comprehensive Income (Loss), Net of Tax (157)   (119)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (20)    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 9 27  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (17) 12  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax (1) 0  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (38) (13)  
OCI before Reclassifications [Member]
      
Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (17)    
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (1)    
Accumulated Other Comprehensive Income (Loss), Net of Tax (34)    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (16)    
Amounts reclassified from AOCI [Member]
      
Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 0    
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 0    
Accumulated Other Comprehensive Income (Loss), Net of Tax (4)    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax $ (4)