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Employee Benefit Plans (Schedule of Estimated Future Employer Contributions) (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Qualified Plan  
2023 $ 168
2024 140
2025 139
2026 143
2027 140
2028 - 2032 663
Non-Qualified Plan  
2023 14
2024 15
2025 15
2026 15
2027 14
2028 - 2032 70
Postretirement Benefit Plan  
2023 3 [1]
2024 3 [1]
2025 3 [1]
2026 2 [1]
2027 2 [1]
2028 - 2032 $ 8 [1]
[1] Estimated benefit payments in the postretirement benefit plan are net of estimated Medicare subsidies.