Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
| Balance at beginning of year | $ (472) | $ (395) |
| Balance acquired from BHI | 0 | (142) |
| Additions for tax positions of the current year | (25) | (21) |
| Additions for tax positions of prior years | (27) | (95) |
| Reductions for tax positions of prior years | 55 | 101 |
| Settlements with tax authorities | 6 | 35 |
| Lapse of statute of limitations | 12 | 45 |
| Balance at end of year | $ (451) | $ (472) |