Borrowings Under Credit Facilities and Commercial Paper Program - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) Term bank	Mar. 31, 2024 CAD ($) Term bank	Dec. 31, 2023 USD ($)	[1]	Mar. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Number of banks in consortium | bank	31	31
Unsecured credit facility and commercial paper	$ 0		$ 0		$ 0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	4,000,000,000
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
Annual facility fee for each bank based on commitment amount	0.15%
Revolving Credit Facility | SOFR
Line of Credit Facility [Line Items]
Interest rate margin (in percent)	0.775%
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 2026
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	1,000,000,000
Unsecured credit facility and commercial paper	0
Revolving Credit Facility | Credit Facility, Tranche Due 2025
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	1,000,000,000
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, 2023 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.