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Stockholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 22,525 |
Net current period other comprehensive income (loss) | $ 24 | $ (28) | (15) | $ 22
Ending balance | 18,027 |  | 18,027 |
Foreign Currency Translation |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 53 | 47
Net unrealized gain (loss) |  |  | (35) | 8
Reclassifications to net income |  |  | 0 | 0
Net current period other comprehensive income (loss) |  |  | (35) | 8
Ending balance | 18 | 55 | 18 | 55
Unrealized Gains and Losses on Available-for-Sale Debt Securities |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 1 | (52)
Net unrealized gain (loss) |  |  | 51 | 49
Reclassifications to net income |  |  | (13) | 0
Net current period other comprehensive income (loss) |  |  | 38 | 49
Ending balance | 39 | (3) | 39 | (3)
Unrealized Gains and Losses on Cash Flow Hedges |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 31 | 85
Net unrealized gain (loss) |  |  | 21 | 29
Reclassifications to net income |  |  | (39) | (64)
Net current period other comprehensive income (loss) |  |  | (18) | (35)
Ending balance | 13 | 50 | 13 | 50
Accumulated Other Comprehensive Income |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  |  | 85 | 80
Net unrealized gain (loss) |  |  | 37 | 86
Reclassifications to net income |  |  | (52) | (64)
Net current period other comprehensive income (loss) | 24 | (28) | (15) | 22
Ending balance | $ 70 | $ 102 | $ 70 | $ 102

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- Definition Amount after tax, before reclassification adjustments of 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
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