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Debt - Borrowings and Repayments (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2020
Debt
New borrowings			$ 7,948.0	$ 9,420.0	$ 13,237.0
Early extinguishment of debt	$ 1,289.0
Premiums paid on early extinguishment of debt			211.0	30.0	84.0
Loss on early extinguishment of debt			(220.0)	(53.0)	(85.0)
Unamortized discounts and debt issuance costs			80.0	85.0
Principal amount outstanding	5,965.0
Debt repayments			8,404.0	$ 9,629.0	$ 10,088.0
Scheduled Debt Payments
2022			2,449.0
2023			651.0
2024			249.0
2025			1,278.0
2026			677.0
Thereafter			8,275.0
Commercial Paper Program [Member]
Debt
Commercial paper repayments			6,900.0
Commercial paper borrowings			6,800.0
Senior Notes, Aggregate [Member]
Debt
Debt instrument face amount	950.0					$ 2,500.0
New borrowings	942.0
Early extinguishment of debt	1,300.0
Premiums paid on early extinguishment of debt	211.0	$ 211.0
Loss on early extinguishment of debt		(220.0)
Accrued interest	15.0
Write-off unamortized debt discounts and issuance costs		9.0
Senior Notes, Aggregate [Member] | Cash Flow Hedging [Member]
Debt
Interest expense		$ 6.0
2.00% senior notes due June 1, 2029 [Member]
Debt
Debt instrument face amount	$ 475.0
Interest rate (as a percent)	2.00%
2.95% senior notes due June 1, 2041 [Member]
Debt
Debt instrument face amount	$ 475.0
Interest rate (as a percent)	2.95%
6.125% senior notes due 2039 [Member]
Debt
Interest rate (as a percent)	6.125%
Early extinguishment of debt	$ 6.0
Principal amount outstanding	$ 252.0
7.75% senior notes due 2032 [Member]
Debt
Interest rate (as a percent)	7.75%
Early extinguishment of debt	$ 9.0
Principal amount outstanding	$ 153.0
7.375% senior notes due 2029 [Member]
Debt
Interest rate (as a percent)	7.375%
Principal amount outstanding	$ 81.0
4.15% senior notes due 2049 [Member]
Debt
Interest rate (as a percent)	4.15%
Early extinguishment of debt	$ 316.0
Principal amount outstanding	$ 1,000.0
4.10% senior notes due 2045 [Member]
Debt
Interest rate (as a percent)	4.10%
Early extinguishment of debt	$ 334.0
Principal amount outstanding	$ 750.0
3.90% senior notes due 2035 [Member]
Debt
Interest rate (as a percent)	3.90%
Early extinguishment of debt	$ 153.0
Principal amount outstanding	$ 450.0
7.00% senior notes due 2028 [Member]
Debt
Interest rate (as a percent)	7.00%
Early extinguishment of debt	$ 73.0
Principal amount outstanding	$ 330.0
7.10% senior notes due 2026 [Member]
Debt
Interest rate (as a percent)	7.10%
Early extinguishment of debt	$ 26.0
Principal amount outstanding	$ 249.0
3.50% senior notes due 2024 [Member]
Debt
Interest rate (as a percent)	3.50%
Early extinguishment of debt	$ 194.0
Principal amount outstanding	$ 350.0
3.125% senior notes due 2025 [Member]
Debt
Interest rate (as a percent)	3.125%
Early extinguishment of debt	$ 178.0
Principal amount outstanding	600.0
3.15% senior notes due 2027 [Member]
Debt
Principal amount outstanding	$ 750.0
2.90% senior notes due 2022 [Member]
Debt
Interest rate (as a percent)	2.90%
Principal amount outstanding	$ 500.0
2.40% senior notes due 2023 [Member]
Debt
Interest rate (as a percent)	2.40%
Principal amount outstanding	$ 500.0
Tax Exempt Bonds [Member]
Debt
New borrowings			175.0
Debt repayments			127.0
Debt refunded and reissued			50.0
Financing leases and other [Member]
Debt
Debt repayments			115.0
Non-cash financing lease incurred			$ 30.0

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The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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The cash outflow due to repaying amounts borrowed by issuing commercial paper.

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Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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The amount of debt refunded and reissued.

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