Financing arrangements - Shelf Registration Statement and Other Facilities (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) renewal_options	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Commercial paper, maximum borrowing capacity		$ 2,500,000,000
Commercial paper		0	$ 0
Annual commitment fees for syndicated, unsecured, revolving credit agreement	0.09%
Line of credit
Debt Instrument [Line Items]
Maximum current borrowing capacity under a syndicated, unsecured, revolving credit agreement	$ 4,000,000,000
Amount by which borrowing capacity under a syndicated unsecured revolving credit agreement may be increased upon our request at discretion of banks	$ 1,250,000,000
Initial commitment term of each bank which is a party to the agreement	5 years
Number of additional term extension options | renewal_options	2
Additional period for extension of commitment term	1 year
Basis spread on variable rate	0.50%
Amount outstanding under syndicated, unsecured, revolving credit facility		$ 0	$ 0
Line of credit | Variable Rate Component One
Debt Instrument [Line Items]
Basis spread on variable rate	1.01%
Line of credit | Variable Rate Component Two
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%