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Employee Benefits - Expected Cash Flows (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Medicare Part D Subsidy Receipts  
2023 $ (3)
2024 (3)
2025 (2)
2026 (2)
2027 (2)
2028 - 2032 (7)
Combined Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2023 566
2024 514
2025 500
2026 482
2027 463
2028 - 2032 2,065
Post-Retirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2023 213
2024 205
2025 198
2026 191
2027 184
2028 - 2032 $ 805