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Contractual interest rate for funds borrowed, under the debt agreement.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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Amount of long-term debt classified as other.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Debt and Credit Facilities - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2026	Mar. 31, 2026	Dec. 31, 2025
Line of Credit Facility [Line Items]
Commercial paper	$ 250		$ 0
Other	15		0
Total debt	14,930		15,859
Current maturities of debt	754		1,000
Long-term debt, excluding current maturities	14,176		14,859
Unamortized debt issuance costs	60		70
Borrowing capacity on existing facilities	2,664		2,911
Fair value of senior unsecured notes	$ 13,499		15,344
Senior Unsecured Notes 3.500% Due 2026
Line of Credit Facility [Line Items]
Rate	3.50%	3.50%
Unsecured debt	$ 0		1,000
Senior Unsecured Notes, 4.550% Due 2027
Line of Credit Facility [Line Items]
Rate	4.55%
Unsecured debt	$ 499		498
Senior Unsecured Notes, 2.125% Due 2027
Line of Credit Facility [Line Items]
Rate	2.125%
Unsecured debt	$ 850		881
Senior Unsecured Notes, 4.700% Due 2027
Line of Credit Facility [Line Items]
Rate	4.70%
Unsecured debt	$ 698		697
Senior Unsecured Notes 3.650% Due 2028
Line of Credit Facility [Line Items]
Rate	3.65%
Unsecured debt	$ 599		599
Senior Unsecured Notes 4.850% Due 2028
Line of Credit Facility [Line Items]
Rate	4.85%
Unsecured debt	$ 597		597
Senior Unsecured Notes, 3.375% Due 2028
Line of Credit Facility [Line Items]
Rate	3.375%
Unsecured debt	$ 679		704
Senior Unsecured Notes 0.750% due 2029
Line of Credit Facility [Line Items]
Rate	0.75%
Unsecured debt	$ 906		939
Senior Unsecured Notes, 4.250% Due 2029
Line of Credit Facility [Line Items]
Rate	4.25%
Unsecured debt	$ 746		744
Senior Unsecured Notes, 4.850% Due 2030
Line of Credit Facility [Line Items]
Rate	4.85%
Unsecured debt	$ 795		794
Senior Unsecured Notes, 1.950% Due 2030
Line of Credit Facility [Line Items]
Rate	1.95%
Unsecured debt	$ 995		995
Senior Unsecured Notes, 2.625% due November 2030
Line of Credit Facility [Line Items]
Rate	2.625%
Unsecured debt	$ 733		759
Senior Unsecured Notes 1.000% due 2031
Line of Credit Facility [Line Items]
Rate	1.00%
Unsecured debt	$ 846		876
Senior Unsecured Notes, 3.375% Due 2032
Line of Credit Facility [Line Items]
Rate	3.375%
Unsecured debt	$ 901		934
Senior Unsecured Notes 4.624% due 2034
Line of Credit Facility [Line Items]
Rate	4.625%
Unsecured debt	$ 742		741
Senior Unsecured Notes, 5.200% Due 2035
Line of Credit Facility [Line Items]
Rate	5.20%
Unsecured debt	$ 991		990
Senior Unsecured Notes, 3.625% Due 2036
Line of Credit Facility [Line Items]
Rate	3.625%
Unsecured debt	$ 671		695
Senior Unsecured Notes, 4.100% Due 2043
Line of Credit Facility [Line Items]
Rate	4.10%
Unsecured debt	$ 393		393
Senior Unsecured Notes 4.375% due 2044
Line of Credit Facility [Line Items]
Rate	4.375%
Unsecured debt	$ 396		396
Senior Unsecured Notes 4.625% due 2046
Line of Credit Facility [Line Items]
Rate	4.625%
Unsecured debt	$ 985		984
Senior Unsecured Notes, 2.900% due 2050
Line of Credit Facility [Line Items]
Rate	2.90%
Unsecured debt	$ 643		$ 643