Borrowings Under Credit Facilities and Commercial Paper Program - Narrative (Details)	6 Months Ended
	Jun. 30, 2025 USD ($) bank term	Jun. 30, 2025 CAD ($) bank term	Dec. 31, 2024 USD ($)	[1]	Jun. 30, 2024 USD ($)
Line of Credit Facility [Line Items]
Number of banks in consortium | bank	29	29
Unsecured credit facility and commercial paper	$ 0		$ 0		$ 0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	5,000,000,000
Unsecured credit facility and commercial paper	$ 0
Number of successive terms | term	2	2
Successive term	6 months
Available in alternate currencies	$ 1,000,000,000
Interest rate margin (in percent)	0.725%
Annual facility fee for each bank based on commitment amount	0.125%
Revolving Credit Facility | Accordion feature
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	$ 1,250,000,000
Revolving Credit Facility | Credit Facility, Tranche Due July 2029
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	2,000,000,000
Unsecured credit facility and commercial paper	0
Revolving Credit Facility | Credit Facility, Tranche Due July 2028
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	3,000,000,000
Unsecured credit facility and commercial paper	0
Term credit facility
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	1,000,000,000
Term credit facility, CAD denominated
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement		$ 250,000,000
Term credit facility, CAD denominated | Accordion feature
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement		$ 250,000,000
Commercial paper note program
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	2,000,000,000
Unsecured credit facility and commercial paper	$ 0
Commercial paper note program | Maximum
Line of Credit Facility [Line Items]
Debt instrument, term (in days)	397 days

[1] The consolidated balance sheet at December 31, 2024 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.