Supplemental Financial Information - Other income (expense) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Other Nonrecurring Income (Expense) [Line Items] | |||
| Other, net | $ 114 | $ 25 | $ 2,001 |
| Total | 114 | 25 | 2,001 |
| Manufacturing Service Arrangements and Transitional Service Arrangements | |||
| Other Nonrecurring Income (Expense) [Line Items] | |||
| Result from MSA and TSA arrangements | $ 0 | $ 0 | $ 0 |