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Debt - Borrowings and Repayments (Detail) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2022	Feb. 28, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Nov. 30, 2020
Debt
New borrowings			$ 8,688	$ 7,948	$ 9,420
Debt repayments			7,328	8,404	9,629
Premiums paid on early extinguishment of debt				$ 211	$ 30
Scheduled Debt Payments
2023			2,423
2024			1,290
2025			1,324
2026			673
2027			1,163
Thereafter			8,275
Commercial Paper Program [Member]
Debt
Commercial paper repayments			6,700
Commercial paper borrowings			6,600
Term Loan maturing May 2024 [Member]
Debt
New borrowings	$ 1,000
4.15% senior notes due 2032 [Member]
Debt
Debt instrument face amount	$ 1,000
Interest rate (as a percent)	4.15%
New borrowings	$ 992
2.90% senior notes due 2022 [Member]
Debt
Interest rate (as a percent)	2.90%
Debt repayments	$ 500
Senior Notes, Aggregate [Member]
Debt
Debt instrument face amount						$ 2,500
Tax Exempt Bonds [Member]
Debt
New borrowings			100
Debt repayments			71
Financing leases and other [Member]
Debt
Debt repayments			93
Financing leases and other [Member] | Low income housing investments [Member]
Debt
Note issued		$ 183	$ 183

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