Debt - Debt Assumed (Details) - Concho Resources Incorporated [Member] - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2021 |
Jan. 15, 2021 |
|
| Debt Instrument [Line Items] | ||
| Long-term debt | $ 4,696 | |
| 3.75% Notes due 2027 | ||
| Debt Instrument [Line Items] | ||
| Stated interest rate | 3.75% | |
| Maturity date | 2027 | |
| Long-term debt | $ 1,000 | |
| 4.3% Notes due 2028 | ||
| Debt Instrument [Line Items] | ||
| Stated interest rate | 4.30% | |
| Maturity date | 2028 | |
| Long-term debt | $ 1,000 | |
| 2.4% Notes due 2031 | ||
| Debt Instrument [Line Items] | ||
| Stated interest rate | 2.40% | |
| Maturity date | 2031 | |
| Long-term debt | $ 500 | |
| 4.875% Notes due 2047 | ||
| Debt Instrument [Line Items] | ||
| Stated interest rate | 4.875% | |
| Maturity date | 2047 | |
| Long-term debt | $ 800 | |
| 4.85% Notes due 2048 | ||
| Debt Instrument [Line Items] | ||
| Stated interest rate | 4.85% | |
| Maturity date | 2048 | |
| Long-term debt | $ 600 |