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Employee Benefits - Expected Cash Flows (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 5
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 971
2021 921
2022 893
2023 868
2024 842
2025 - 2029 3,813
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 242
2021 238
2022 232
2023 226
2024 219
2025 - 2029 986
Medicare Part D Subsidy Receipts  
2020 (6)
2021 (6)
2022 (6)
2023 (5)
2024 (5)
2025 - 2029 $ (20)