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Debt - Classification and Utilization (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 31, 2022	Mar. 31, 2023	Dec. 31, 2022
Debt
Debt maturing or subject to remarketing within twelve months		$ 2,300
Current portion of long-term debt		336	$ 414
Debt classified as long-term due to intent and ability to refinance on long-term basis		1,900
Carrying value of debt		15,370	14,984
Revolving Credit Facility [Member]
Debt
Maximum capacity		3,500
Outstanding borrowings under credit facility		0
Letters of credit outstanding		165
Unused and available credit capacity		2,500
Term Loan maturing May 2024 [Member]
Debt
Maximum capacity	$ 1,000
Debt term	2 years
Carrying value of debt		1,000	1,000
Commercial Paper Program [Member]
Debt
Debt maturing or subject to remarketing within twelve months		$ 861
Debt term		397 days
Carrying value of debt		$ 863	1,730
Commercial paper borrowings		861
Tax Exempt Bonds [Member]
Debt
Debt maturing or subject to remarketing within twelve months		65
Debt with interest rate periods that expire in the next 12 months		725
Carrying value of debt		$ 2,648	$ 2,648
Tax Exempt Bonds [Member] \| Minimum [Member]
Debt
Interest rate (as a percent)		0.40%	0.40%
Tax Exempt Bonds [Member] \| Maximum [Member]
Debt
Interest rate (as a percent)		4.40%	4.40%
2.40% senior notes due 2023 [Member]
Debt
Debt maturing or subject to remarketing within twelve months		$ 500
Interest rate (as a percent)		2.40%
Other Letter Of Credit Lines [Member]
Debt
Letters of credit outstanding		$ 796
Financing leases and other [Member]
Debt
Debt maturing or subject to remarketing within twelve months		186
Carrying value of debt		$ 704	$ 699