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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

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