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Employee Benefits - Expected Cash Flows (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Medicare Part D Subsidy Receipts  
2025 $ (2)
2026 (2)
2027 (2)
2028 (2)
2029 (1)
2030 - 2034 (5)
Combined Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2025 569
2026 490
2027 473
2028 450
2029 433
2030 - 2034 1,899
Post-Retirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2025 188
2026 184
2027 180
2028 173
2029 166
2030 - 2034 $ 720