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Commitments and Contingencies Level 4 (Details) - Annual Purchase Commitments
$ in Millions
Dec. 31, 2020
USD ($)
Long-term Purchase Commitment [Line Items]  
2021 $ 190
2022 134
2023 94
2024 50
2025 49
2026 and beyond 253
Total minimum payments 770
Less: Amount representing interest (31)
Present Value of Minimum Payments $ 739