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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income The following table summarizes the changes in AOCI by component, net of tax during the nine months ended September 30, 2019 and 2018 (in millions):
|  | Foreign Currency Translation |  | Unrealized Gains and Losses on Available-for-Sale Debt Securities |  | Unrealized Gains and Losses on Cash Flow Hedges |  | Total
Balance at December 31, 2018 |  | $ | 47 |  |  | $ | (52 | ) |  | $ | 85 |  |  | $ | 80 |
Net unrealized gain (loss) |  | (19 | ) |  | 53 |  |  | 99 |  |  | 133 |
Reclassifications to net income |  | — |  |  | — |  |  | (96 | ) |  | (96 | )
Net current period other comprehensive income (loss) |  | (19 | ) |  | 53 |  |  | 3 |  |  | 37 |
Balance at September 30, 2019 |  | $ | 28 |  |  | $ | 1 |  |  | $ | 88 |  |  | $ | 117 |
|  | Foreign Currency Translation |  | Unrealized Gains and Losses on Available-for-Sale Debt Securities |  | Unrealized Gains and Losses on Cash Flow Hedges |  | Total
Balance at December 31, 2017 |  | $ | 85 |  |  | $ | 194 |  |  | $ | (114 | ) |  | $ | 165 |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  | — |  |  | (293 | ) |  | — |  |  | (293 | )
Balance at January 1, 2018 |  | 85 |  |  | (99 | ) |  | (114 | ) |  | (128 | )
Net unrealized gain (loss) |  | (17 | ) |  | 25 |  |  | 51 |  |  | 59 |
Reclassifications to net income |  | — |  |  | 4 |  |  | 101 |  |  | 105 |
Net current period other comprehensive income (loss) |  | (17 | ) |  | 29 |  |  | 152 |  |  | 164 |
Balance at September 30, 2018 |  | $ | 68 |  |  | $ | (70 | ) |  | $ | 38 |  |  | $ | 36 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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