Related Party Transactions (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Significant transactions with related parties | ||||
| Operating revenues and other income | $ 22 | $ 21 | $ 63 | $ 59 |
| Purchases | 1 | 0 | 5 | 0 |
| Operating expenses and selling, general and administrative expenses | 45 | 16 | 135 | 43 |
| Net interest (income) expense | $ 0 | $ (1) | $ (2) | $ (5) |