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Employee Benefits - Expected Benefit Payments to Retirees (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 2,227
2021 1,680
2022 1,620
2023 1,577
2024 1,072
2025-2029 5,248
Health Care and Life  
Defined Benefit Plan Disclosure [Line Items]  
2020 961
2021 947
2022 930
2023 968
2024 951
2025-2029 $ 4,569