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Benefit Plans (Detail) - Pension Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 34 $ 36 $ 69 $ 79
Interest cost 19 17 38 37
Expected return on plan assets (46) (41) (94) (89)
Amortization of prior service credit (4) (3) (8) (7)
Amortization of loss 15 23 31 50
Settlements 1 0 6 0
Net pension cost $ 18 $ 32 $ 42 $ 69