Debt and Derivatives - Borrowings and Repayments (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 28, 2023	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022
Debt
New borrowings			$ 11,356	$ 5,360
Debt repayments			11,074	$ 4,683
Commercial Paper Program [Member]
Debt
Commercial paper repayments			10,500
Commercial paper borrowings			10,100
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
Tax Exempt Bonds [Member]
Debt
New borrowings			50
Debt repayments			40
Financing leases and other [Member]
Debt
Debt repayments			58
Non-cash financing lease incurred			$ 61
Senior Notes 2.4 Percent Due May 2023 [Member]
Debt
Interest rate (as a percent)		2.40%	2.40%
Debt repayments		$ 500