Debt and Derivatives - Borrowings and Repayments (Detail) - USD ($) $ in Millions	1 Months Ended			9 Months Ended
	Aug. 31, 2023	Jul. 31, 2023	Feb. 28, 2023	Sep. 30, 2023	Sep. 30, 2022
Debt
New borrowings				$ 17,319	$ 5,916
Debt repayments				16,991	$ 5,429
Commercial Paper Program [Member]
Debt
Commercial paper repayments				15,300
Commercial paper borrowings				14,100
Term Loan [Member]
Debt
Debt repayments	$ 1,000
4.625% senior notes due 2030 and 2033 [Member]
Debt
Interest rate (as a percent)			4.625%
New borrowings			$ 1,240
4.625% senior notes due 2030 [Member]
Debt
Debt instrument face amount			750
4.625% senior notes due 2033 [Member]
Debt
Debt instrument face amount			$ 500
Senior Notes 4.875 Percent Due 2029 And 2034 [Member]
Debt
Interest rate (as a percent)		4.875%
New borrowings		$ 1,970
Senior Notes 4.875 Percent Due 2029 [Member]
Debt
Debt instrument face amount		750
Senior Notes 4.875 Percent Due 2034 [Member]
Debt
Debt instrument face amount		$ 1,250
Tax Exempt Bonds [Member]
Debt
New borrowings				50
Debt repayments				65
Financing leases and other [Member]
Debt
Debt repayments				91
Non-cash financing lease incurred				$ 78
Senior Notes 2.4 Percent Due May 2023 [Member]
Debt
Interest rate (as a percent)			2.40%
Debt repayments			$ 500