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Employee Benefits - Expected Cash Flows (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 966
2020 938
2021 916
2022 891
2023 867
2024 - 2028 3,971
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 277
2020 269
2021 261
2022 252
2023 243
2024 - 2028 1,065
Medicare Part D Subsidy Receipts  
2019 (7)
2020 (7)
2021 (7)
2022 (7)
2023 (6)
2024 - 2028 $ (26)