v2.4.0.6
Guarantee of Securities of Subsidiaries Comprehensive income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 656 $ (73)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (31) (86)
Reclassification of change in fair value of derivatives to net income (6) 23
Foreign currency translation adjustments (33) 29
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (1) 0
Other Comprehensive Income (Loss), Net of Tax (71) (34)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 585 (107)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 331 (115)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 254 8
Parent Company [Member]
    
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 292 21
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (16) (34)
Reclassification of change in fair value of derivatives to net income (4) 9
Foreign currency translation adjustments (17) 12
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (1)  
Other Comprehensive Income (Loss), Net of Tax (38) (13)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 254 8
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 254 8
Guarantor Subsidiaries [Member]
    
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 61 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 0
Reclassification of change in fair value of derivatives to net income 0 0
Foreign currency translation adjustments 0 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (11)  
Other Comprehensive Income (Loss), Net of Tax (11) 0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 50 0
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 50 0
Subsidiary Issuer [Member]
    
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 61 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 0
Reclassification of change in fair value of derivatives to net income 0 0
Foreign currency translation adjustments 0 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (11)  
Other Comprehensive Income (Loss), Net of Tax (11) 0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 50 0
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 50 0
Non-Guarantor Subsidiaries [Member]
    
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 785 (29)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (26) (86)
Reclassification of change in fair value of derivatives to net income (4) 23
Foreign currency translation adjustments (28) 29
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (11)  
Other Comprehensive Income (Loss), Net of Tax (69) (34)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 716 (63)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest (331) 115
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 385 52
Consolidation, Eliminations [Member]
    
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (543) (65)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 11 34
Reclassification of change in fair value of derivatives to net income 2 (9)
Foreign currency translation adjustments 12 (12)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 33  
Other Comprehensive Income (Loss), Net of Tax 58 13
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (485) (52)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (485) (52)
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
    
Guarantor Obligations [Line Items]    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 656 (73)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (31) (86)
Reclassification of change in fair value of derivatives to net income (6) 23
Foreign currency translation adjustments (33) 29
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (1)  
Other Comprehensive Income (Loss), Net of Tax (71) (34)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 585 (107)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest (331) 115
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 254 $ 8