v2.4.0.8
Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 72 $ 115
Foreign currency translation adjustment (21) (64)
Income tax expense on amortization of postretirement benefit plan items (1) (2)
Unrealized loss on foreign exchange agreements   (2)
Reclassification of unrealized gain on foreign exchange agreements into revenue   (1)
Ending balance 55 55
Foreign Currency Translation
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 293 336
Foreign currency translation adjustment (21) (64)
Income tax expense on amortization of postretirement benefit plan items 0 0
Unrealized loss on foreign exchange agreements   0
Reclassification of unrealized gain on foreign exchange agreements into revenue   0
Ending balance 272 272
Postretirement Benefit Plans
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (219) (222)
Foreign currency translation adjustment 0 0
Income tax expense on amortization of postretirement benefit plan items (1) (2)
Unrealized loss on foreign exchange agreements   0
Reclassification of unrealized gain on foreign exchange agreements into revenue   0
Ending balance (215) (215)
Derivative Instruments
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (2) 1
Foreign currency translation adjustment 0 0
Income tax expense on amortization of postretirement benefit plan items 0 0
Unrealized loss on foreign exchange agreements   (2)
Reclassification of unrealized gain on foreign exchange agreements into revenue   (1)
Ending balance (2) (2)
Cost of revenue
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 1 2
Cost of revenue | Foreign Currency Translation
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 0 0
Cost of revenue | Postretirement Benefit Plans
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 1 2
Cost of revenue | Derivative Instruments
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 0 0
Selling, general and administrative expenses
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 3 5
Selling, general and administrative expenses | Foreign Currency Translation
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 0 0
Selling, general and administrative expenses | Postretirement Benefit Plans
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 3 5
Selling, general and administrative expenses | Derivative Instruments
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 0 0
Other non-operating expense, net
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 1 2
Other non-operating expense, net | Foreign Currency Translation
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 0 0
Other non-operating expense, net | Postretirement Benefit Plans
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: 1 2
Other non-operating expense, net | Derivative Instruments
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Amortization of net actuarial loss on postretirement benefit plans into: $ 0 $ 0