Borrowings Under Credit Facilities and Commercial Paper Program - Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) Term bank	Mar. 31, 2023 CAD ($) Term bank	Dec. 31, 2022 USD ($)	[1]
Line of Credit Facility [Line Items]
Number of banks in consortium | bank	31	31
Borrowings outstanding	$ 0		$ 0
Unsecured revolving credit facility
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	4,000,000,000
Borrowings outstanding	$ 0
Number of successive terms | Term	2	2
Successive term	6 months
Available to borrow in alternate currencies (upto)	$ 1,000,000,000
Annual facility fee for each bank based on commitment amount	0.15%
Unsecured revolving credit facility | Credit Facility, Tranche Due 2026
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	$ 1,000,000,000
Borrowings outstanding	0
Unsecured revolving credit facility | Credit Facility, Tranche Due 2025
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	3,000,000,000
Borrowings outstanding	$ 0
Unsecured revolving credit facility | SOFR
Line of Credit Facility [Line Items]
Application margin over index, based on certain debt ratings	0.775%
Unsecured revolving credit facility | Accordion feature
Line of Credit Facility [Line Items]
Unsecured line of credit arrangement	$ 1,250,000,000
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
Commercial paper note program | Maximum
Line of Credit Facility [Line Items]
Debt instrument, term	397 days

[1] The consolidated balance sheet at December 31, 2022 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.