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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income (loss) are as follows (in millions):
|  | Currency Translation Adjustments |  |  | Derivative Financial Instruments, Net of Tax |  |  | Defined Benefit Plans, Net of Tax |  |  | Total |
Balance at December 31, 2014 |  | $ | (515 | ) |  | $ | (228 | ) |  | $ | (91 | ) |  | $ | (834 | )
Accumulated other comprehensive income (loss) before reclassifications |  |  | (764 | ) |  |  | (176 | ) |  |  | 26 |  |  |  | (914 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | 199 |  |  |  | (4 | ) |  |  | 195 |
Balance at December 31, 2015 |  | $ | (1,279 | ) |  | $ | (205 | ) |  | $ | (69 | ) |  | $ | (1,553 | )
Accumulated other comprehensive income (loss) before reclassifications |  |  | (97 | ) |  |  | 32 |  |  |  | 35 |  |  |  | (30 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | 134 |  |  |  | (3 | ) |  |  | 131 |
Balance at December 31, 2016 |  | $ | (1,376 | ) |  | $ | (39 | ) |  | $ | (37 | ) |  | $ | (1,452 | )
Accumulated other comprehensive income (loss) before reclassifications |  |  | 272 |  |  |  | 41 |  |  |  | 25 |  |  |  | 338 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | — |  |  |  | 5 |  |  |  | (1 | ) |  |  | 4 |
Balance at December 31, 2017 |  | $ | (1,104 | ) |  | $ | 7 |  |  | $ | (13 | ) |  | $ | (1,110 | )
Components of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | The components of amounts reclassified from accumulated other comprehensive income (loss) are as follows (in millions):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Currency Translation Adjustments |  |  | Derivative Financial Instruments |  |  | Defined Benefit Plans |  |  | Total |  |  | Currency Translation Adjustments |  |  | Derivative Financial Instruments |  |  | Defined Benefit Plans |  |  | Total |  |  | Currency Translation Adjustments |  |  | Derivative Financial Instruments |  |  | Defined Benefit Plans |  |  | Total |
Revenue |  | $ | — |  |  | $ | (8 | ) |  | $ | — |  |  | $ | (8 | ) |  | $ | — |  |  | $ | (5 | ) |  | $ | — |  |  | $ | (5 | ) |  | $ | — |  |  | $ | (19 | ) |  | $ | — |  |  | $ | (19 | )
Cost of revenue |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | 191 |  |  |  | — |  |  |  | 191 |  |  |  | — |  |  |  | 295 |  |  |  | — |  |  |  | 295 |
Selling, general, and administrative |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (5 | ) |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | (6 | ) |  |  | (6 | )
Tax effect |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | (52 | ) |  |  | 2 |  |  |  | (50 | ) |  |  | — |  |  |  | (77 | ) |  |  | 2 |  |  |  | (75 | )
|  | $ | — |  |  | $ | 5 |  |  | $ | (1 | ) |  | $ | 4 |  |  | $ | — |  |  | $ | 134 |  |  | $ | (3 | ) |  | $ | 131 |  |  | $ | — |  |  | $ | 199 |  |  | $ | (4 | ) |  | $ | 195 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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