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Employee Benefit Plans (Schedule of Estimated Future Employer Contributions) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Qualified Plan  
2022 $ 215
2023 147
2024 148
2025 144
2026 144
2027 - 2031 687
Non-Qualified Plan  
2022 14
2023 14
2024 14
2025 14
2026 14
2027 - 2031 68
Postretirement Benefit Plan  
2022 4 [1]
2023 4 [1]
2024 3 [1]
2025 3 [1]
2026 3 [1]
2027 - 2031 $ 9 [1]
[1] Estimated benefit payments in the postretirement benefit plan are net of estimated Medicare subsidies.