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CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Derivative Instruments
Dec. 31, 2011
Derivative Instruments
Dec. 31, 2010
Derivative Instruments
Dec. 31, 2012
Translation Adjustments
Dec. 31, 2011
Translation Adjustments
Dec. 31, 2010
Translation Adjustments
Dec. 31, 2011
Other
Dec. 31, 2009
Other
Increase (Decrease) in Accumulated Other Comprehensive Income                      
Balance at beginning of period $ 54 $ 118 $ 123 $ (102) $ (79) $ 18 $ 156 $ 198 $ 106 $ (1) $ (1)
Reclassification adjustments (62) 131 (24) (62) 131 (24)          
Deferred gain/(loss) on cash flow hedges, net of tax 44 (154) (73) 44 (154) (73)          
Currency translation adjustments 44 (42) 92       44 (42) 92    
Proportionate share of our unconsolidated entities' other comprehensive income   1               1  
Total period activity 26 (64) (5) (18) (23) (97) 44 (42) 92 1  
Balance at end of period $ 80 $ 54 $ 118 $ (120) $ (102) $ (79) $ 200 $ 156 $ 198   $ (1)