Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Beginning balance | $ (233) | | $ (99) | |
Foreign currency translation adjustment | 26 | $ 3 | (103) | $ 1 |
Foreign currency gain reclassified into gain on sale of businesses | 0 | $ 0 | (8) | $ 0 |
Income tax expense on amortization of postretirement benefit plan items | (1) | | (2) | |
Unrealized loss on foreign exchange agreements | | | (5) | |
Ending balance | (198) | | (198) | |
Foreign Currency Translation | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Beginning balance | 8 | | 145 | |
Foreign currency translation adjustment | 26 | | (103) | |
Income tax expense on amortization of postretirement benefit plan items | 0 | | 0 | |
Unrealized loss on foreign exchange agreements | | | 0 | |
Ending balance | 34 | | 34 | |
Postretirement Benefit Plans | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Beginning balance | (228) | | (231) | |
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 | |
Ending balance | (225) | | (225) | |
Derivative Instruments | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Beginning balance | (13) | | (13) | |
Foreign currency translation adjustment | 0 | | 0 | |
Income tax expense on amortization of postretirement benefit plan items | 0 | | 0 | |
Unrealized loss on foreign exchange agreements | | | (5) | |
Ending balance | (7) | | (7) | |
Gain on sale of businesses | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Foreign currency gain reclassified into gain on sale of businesses | | | 8 | |
Gain on sale of businesses | Foreign Currency Translation | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Foreign currency gain reclassified into gain on sale of businesses | | | 8 | |
Gain on sale of businesses | Postretirement Benefit Plans | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Foreign currency gain reclassified into gain on sale of businesses | | | 0 | |
Gain on sale of businesses | Derivative Instruments | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Foreign currency gain reclassified into gain on sale of businesses | | | 0 | |
Cost of revenue | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Amortization of net actuarial loss on postretirement benefit plans into: | 1 | | 2 | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | | | (1) | |
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 | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | | | 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 | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | | | 0 | |
Cost of revenue | Derivative Instruments | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Amortization of net actuarial loss on postretirement benefit plans into: | 0 | | 0 | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | | | (1) | |
Selling, general and administrative expenses | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Amortization of net actuarial loss on postretirement benefit plans into: | 2 | | 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: | 2 | | 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 | | 1 | |
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 | | 1 | |
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 | |
Revenue | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | (7) | | (11) | |
Income tax benefit on reclassification of unrealized loss on foreign exchange agreements into revenue | (1) | | (1) | |
Revenue | Foreign Currency Translation | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | 0 | | 0 | |
Income tax benefit on reclassification of unrealized loss on foreign exchange agreements into revenue | 0 | | 0 | |
Revenue | Postretirement Benefit Plans | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | 0 | | 0 | |
Income tax benefit on reclassification of unrealized loss on foreign exchange agreements into revenue | 0 | | 0 | |
Revenue | Derivative Instruments | | | | |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] | | | | |
Reclassification of unrealized gain (loss) on foreign exchange agreements | (7) | | (11) | |
Income tax benefit on reclassification of unrealized loss on foreign exchange agreements into revenue | $ (1) | | $ (1) | |