Borrowings Under Credit Facilities and Commercial Paper Program - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) bank Term	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Number of banks in consortium | bank	31
Borrowings outstanding	$ 0	$ 0	$ 325,000,000
Total outstanding balance	15,735,549,000
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
Successive term	6 months
Available to borrow in alternate currencies (up to)	$ 1,000,000,000
Annual facility fee for each bank based on commitment amount	0.15%
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
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
Revolving Credit Facility | SOFR
Line of Credit Facility [Line Items]
Applicable margin over index, based on certain debt ratings	0.775%
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
Total outstanding balance	$ 0
Commercial Paper Note Program | Maximum
Line of Credit Facility [Line Items]
Debt instrument, term	397 days