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Employee Benefits - Expected Cash Flows (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Medicare Part D Subsidy Receipts  
2021 $ (5)
2022 (5)
2023 (5)
2024 (4)
2025 (4)
2026 - 2030 (16)
Combined Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 961
2022 868
2023 844
2024 819
2025 794
2026 - 2030 3,578
Post-Retirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 238
2022 232
2023 225
2024 217
2025 210
2026 - 2030 $ 932