Related Party Transactions (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
| Significant transactions with related parties | ||||
| Operating revenues and other income | $ 24 | $ 21 | $ 40 | $ 38 |
| Purchases | 3 | 0 | 3 | 0 |
| Operating expenses and selling, general and administrative expenses | 63 | 12 | 89 | 27 |
| Net interest (income) expense | $ 0 | $ (2) | $ (1) | $ (4) |