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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 2,293 | $ 2,731 | $ 2,541 | $ 2,660
Total other comprehensive (loss) income |  | (13) | 22 | (2)
Balance at end of period |  | 2,293 | 2,731 | 2,541
Interest expense |  | 193 | 176 | 163
Cash flow hedge loss to be recognized in cost of processing and services during the next 12 months |  | 1 |  |
Designated as hedging instrument | Foreign currency forward exchange contracts | Indian Rupee |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Notional amount |  | 202 | 150 |
Total fair value |  |  | (8) |
Forecast | Designated as hedging instrument | Interest rate contract |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Interest expense | 6 |  |  |
Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (16) | (14) | (24) |
Other comprehensive loss before reclassifications |  | (5) | 4 |
Amounts reclassified from accumulated other comprehensive loss |  | 3 | 6 |
Total other comprehensive (loss) income |  | (2) | 10 |
Balance at end of period |  | (16) | (14) | (24)
Foreign Currency Translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (49) | (38) | (50) |
Other comprehensive loss before reclassifications |  | (11) | 12 |
Amounts reclassified from accumulated other comprehensive loss |  | 0 | 0 |
Total other comprehensive (loss) income |  | (11) | 12 |
Balance at end of period |  | (49) | (38) | (50)
Other |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2) | (2) | (2) |
Other comprehensive loss before reclassifications |  | 0 | 0 |
Amounts reclassified from accumulated other comprehensive loss |  | 0 | 0 |
Total other comprehensive (loss) income |  | 0 | 0 |
Balance at end of period |  | (2) | (2) | (2)
Total |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ (67) | (54) | (76) | (74)
Other comprehensive loss before reclassifications |  | (16) | 16 |
Amounts reclassified from accumulated other comprehensive loss |  | 3 | 6 |
Total other comprehensive (loss) income |  | (13) | 22 | (2)
Balance at end of period |  | $ (67) | (54) | $ (76)
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | 3 |
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Foreign Currency Translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | 0 |
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Other |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | 0 |
Accounting Standards Update 2017-12 | New Accounting Pronouncement, Early Adoption, Effect | Total |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | 3 |
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | (3) |
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Foreign Currency Translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | 0 |
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Other |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | 0 |
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect | Total |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Cumulative effect of new accounting principle |  |  | $ (3) |

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