Debt and Derivatives - Classification and Utilization (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2022	Dec. 31, 2023
Debt
Debt maturing or subject to remarketing within twelve months		$ 2,800
Revolving Credit Facility [Member]
Debt
Maximum capacity		3,500
Accordion option capacity	$ 1,000
Outstanding borrowings under credit facility		0
Letters of credit outstanding		180
Unused and available credit capacity		2,500
Revolving Credit Facility [Member] | Minimum [Member]
Debt
Spread rate	0.585%
Revolving Credit Facility [Member] | Maximum [Member]
Debt
Spread rate	1.025%
Revolving Credit Facility [Member] | SOFR [Member]
Debt
Spread rate	0.10%
Credit Facility Revolving Canadian [Member]
Debt
Maximum capacity	$ 375
Term Loan [Member]
Debt
Maximum capacity	$ 1,000
Debt term	2 years
Commercial Paper Program [Member]
Debt
Debt maturing or subject to remarketing within twelve months		$ 859
Debt term		397 days
Commercial paper borrowings		$ 859
Tax Exempt Bonds [Member]
Debt
Debt maturing or subject to remarketing within twelve months		60
Debt with interest rate periods that expire in the next 12 months		1,600
Debt classified as long-term due to intent and ability to refinance on long-term basis		$ 2,400
Tax Exempt Bonds [Member] | Minimum [Member]
Debt
Interest rate (as a percent)		0.55%
Tax Exempt Bonds [Member] | Maximum [Member]
Debt
Interest rate (as a percent)		5.00%
Senior Notes 3.5 % Due 2024 Member
Debt
Debt maturing or subject to remarketing within twelve months		$ 156
Interest rate (as a percent)		3.50%
Other Letter Of Credit Lines [Member]
Debt
Letters of credit outstanding		$ 834
Financing leases and other [Member]
Debt
Debt maturing or subject to remarketing within twelve months		$ 175