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Employee Benefits - Expected Cash Flows (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Medicare Part D Subsidy Receipts  
2024 $ (2)
2025 (2)
2026 (2)
2027 (2)
2028 (2)
2029 - 2033 (6)
Combined Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 574
2025 493
2026 475
2027 458
2028 440
2029 - 2033 1,974
Post-Retirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2024 195
2025 191
2026 186
2027 181
2028 174
2029 - 2033 $ 762