Income Taxes - Schedule of Reserve for Uncertain Tax Positions That May BE Challenged (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Gross unrecognized tax benefits, beginning of period | $ 257 | $ 277 | $ 257 |
| Gross increases: | |||
| Current year tax positions | 39 | 7 | |
| Prior year tax positions | 14 | 14 | |
| Gross decreases: | |||
| Prior year tax positions | $ 0 | (8) | |
| Settlements | (16) | ||
| Statute of limitation lapses | (1) | (1) | |
| Gross unrecognized tax benefits, end of period | $ 305 | $ 277 | |
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- Definition Gross Decreases [Abstract] No definition available.
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- Definition Gross Increases [Abstract] No definition available.
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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