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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | $ (198) |  | $ (99) |
Foreign currency translation adjustment | (39) | $ (114) | (142) | $ (113)
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) |  | (3) |
Unrealized loss on foreign exchange agreements |  |  | (5) |
Ending balance | (229) |  | (229) |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | 34 |  | 145 |
Foreign currency translation adjustment | (39) |  | (142) |
Income tax expense on amortization of postretirement benefit plan items | 0 |  | 0 |
Unrealized loss on foreign exchange agreements |  |  | 0 |
Ending balance | (5) |  | (5) |
Postretirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (225) |  | (231) |
Foreign currency translation adjustment | 0 |  | 0 |
Income tax expense on amortization of postretirement benefit plan items | (1) |  | (3) |
Unrealized loss on foreign exchange agreements |  |  | 0 |
Ending balance | (222) |  | (222) |
Derivative Instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (7) |  | (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 | (2) |  | (2) |
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 |  | 3 |
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 |  | 3 |
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 |  | 7 |
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 |  | 7 |
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 |
Research and development expense |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Amortization of net actuarial loss on postretirement benefit plans into: | 1 |  | 1 |
Research and development expense | Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Amortization of net actuarial loss on postretirement benefit plans into: | 0 |  | 0 |
Research and development expense | Postretirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Amortization of net actuarial loss on postretirement benefit plans into: | 1 |  | 1 |
Research and development expense | 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 |
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 |
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 |
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 |
Revenue |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | (5) |  | (16) |
Income tax benefit on reclassification of unrealized loss on foreign exchange agreements into revenue |  |  | (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 |
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 |
Revenue | Derivative Instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | $ (5) |  | (16) |
Income tax benefit on reclassification of unrealized loss on foreign exchange agreements into revenue |  |  | $ (1) |

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