Sales and Other Operating Revenues - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | |
---|---|---|
Mar. 31, 2021 |
Dec. 31, 2020 |
|
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | ||
Accounts receivable | $ 5,375 | $ 3,911 |
Receivables from contracts with customers | $ 414 | $ 404 |
Minimum | ||
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | ||
Customer contracts, term | 5 years | |
Maximum | ||
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] | ||
Customer contracts, term | 15 years |