Long-Term Debt - Schedule of Debt (Details) $ in Millions	Jun. 30, 2021 USD ($) agreement
Annual maturities of long-term debt
Remainder of 2021	$ 32
2022	67
2023	67
2024	4,438
2025	8,226
Thereafter	1,843
Total debt	14,673
Estimated interest payments
Remainder of 2021	410
2022	810
2023	800
2024	820
2025	590
Thereafter	300
Debt estimate interest payment, due	3,730
Total debt service obligation (a)
Remainder of 2021	442
2022	877
2023	867
2024	5,258
2025	8,816
Thereafter	2,143
Debt service obligation	$ 18,403
CRC Credit Agreement
Long-term debt
Number of interest rate derivatives held \| agreement	7

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