Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(2))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a)(3))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Debt - Classification and Utilization (Detail) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
	May 27, 2022	May 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Debt
Debt maturing or subject to remarketing within twelve months			$ 2,200
Current portion of long-term debt			258	$ 708
Carrying value of debt			14,063	13,405
Revolving Credit Facility [Member]
Debt
Maximum capacity		$ 3,500	3,500
Accordion option capacity		$ 1,000
Outstanding borrowings under credit facility			0
Letters of credit outstanding			164
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
Interest rate (as a percent)			3.80%
Maximum capacity	$ 1,000
Debt term	2 years
Carrying value of debt			$ 1,000
Term Loan [Member] \| SOFR [Member] \| Minimum [Member]
Debt
Spread rate	0.50%
Term Loan [Member] \| SOFR [Member] \| Maximum [Member]
Debt
Spread rate	0.90%
Commercial Paper Program [Member]
Debt
Debt maturing or subject to remarketing within twelve months			$ 839
Debt term			397 days
Carrying value of debt			$ 840	1,778
Commercial paper borrowings			839
Tax Exempt Bonds [Member]
Debt
Debt maturing or subject to remarketing within twelve months			136
Debt with interest rate periods that expire in the next 12 months			625
Debt classified as long-term due to intent and ability to refinance on long-term basis			2,000
Variable-rate tax-exempt bonds			54
Carrying value of debt			$ 2,619	2,619
Tax Exempt Bonds [Member] \| Minimum [Member]
Debt
Interest rate (as a percent)			0.30%
Tax Exempt Bonds [Member] \| Maximum [Member]
Debt
Interest rate (as a percent)			4.30%
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			$ 761
Financing leases and other [Member]
Debt
Debt maturing or subject to remarketing within twelve months			258
Carrying value of debt			$ 698	$ 567