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Employee Postretirement Benefits (Gross Benefit Payments) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Defined Benefit Pension Plans  
2020 $ 196
2021 199
2022 206
2023 203
2024 205
2025-2029 1,004
Other Postretirement Benefit Plans  
2020 61
2021 62
2022 61
2023 58
2024 54
2025-2029 $ 236