Restructuring Charges - Schedule of Components of Restructuring Charges (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | $ 78 | $ 28 | $ 6 |
| Personnel lay-off costs | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 78 | 32 | 4 |
| Other exit costs | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | 0 | 0 | 2 |
| Release of provisions/accruals | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Net restructuring charges | $ 0 | $ (4) | $ 0 |