Debt and Derivatives - Borrowings and Repayments (Detail) - USD ($) $ in Millions		1 Months Ended				12 Months Ended
	Nov. 08, 2024	Nov. 30, 2024	Oct. 31, 2024	Jul. 31, 2024	May 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt
Debt repayments						$ 17,870	$ 20,394	$ 7,328
Loss on early extinguishment of debt, net						(7)
Net proceeds		$ 5,200		$ 1,490		24,578	$ 21,306	$ 8,688
Scheduled Debt Payments
2025						2,613
2026						747
2027						2,022
2028						1,969
2029						2,048
Thereafter						14,680
Commercial Paper Program [Member]
Debt
Commercial paper repayments						12,300
Commercial paper borrowings						12,700
4.950% senior notes due 2027 [Member]
Debt
Debt instrument face amount				$ 750
Interest rate (as a percent)				4.95%
4.950% senior notes due 2031 [Member]
Debt
Debt instrument face amount				$ 750
Interest rate (as a percent)				4.95%
3.50% senior notes due 2024 [Member]
Debt
Interest rate (as a percent)					3.50%
Debt repayments					$ 156
4.500% senior notes due 2028 [Member]
Debt
Debt instrument face amount		$ 1,000
Interest rate (as a percent)		4.50%
4.650% senior notes due 2030 [Member]
Debt
Debt instrument face amount		$ 700
Interest rate (as a percent)		4.65%
4.800% senior notes due 2032 [Member]
Debt
Debt instrument face amount		$ 750
Interest rate (as a percent)		4.80%
4.950% senior notes due 2035 [Member]
Debt
Debt instrument face amount		$ 1,500
Interest rate (as a percent)		4.95%
5.350% senior notes due 2054 [Member]
Debt
Debt instrument face amount		$ 1,250
Interest rate (as a percent)		5.35%
Term Credit Agreement [Member]
Debt
Debt instrument face amount			$ 5,200
Debt repayments		$ 5,200
Loss on early extinguishment of debt, net		$ (7)
Net proceeds			5,200
Stericycle 3.875% senior notes due 2029 [Member]
Debt
Debt instrument face amount						15
Interest rate (as a percent)	3.875%
Original debt amount	$ 500
Debt amount tendered						$ 485
Debt amount tendered (as a percent)						97.00%
Aggregate principal amounts of notes redeemed (as a percent)						97.00%
Tax Exempt Bonds [Member]
Debt
Debt repayments						$ 60
Net proceeds						50
Financing leases and other [Member]
Debt
Non-cash financing lease incurred						153
Debt repayments						135
Financing leases and other [Member] | Low income housing investments [Member]
Debt
Note issued			$ 316			$ 316
Senior Notes 0.750 Percent Due November 2025 [Member]
Debt
Interest rate (as a percent)						0.75%