Debt and lines of credit - Additional Information (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2024 USD ($)	Feb. 29, 2024 USD ($) series	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Debt Instrument [Line Items]
Commercial paper			$ 0		$ 0
Repayment of debt					300,000,000	$ 500,000,000
Proceeds from issuance of long-term debt					2,980,000,000	3,000,000,000
Interest and debt expense			131,000,000	$ 89,000,000	247,000,000	157,000,000
Interest costs capitalized			$ 5,000,000	$ 3,000,000	$ 11,000,000	$ 5,000,000
Notes due 2024 at 2.625%
Debt Instrument [Line Items]
Repayment of debt	$ 300,000,000
Long-term debt stated interest rate (in percentage)			2.625%		2.625%
Notes due 2027 at 4.60%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			4.60%		4.60%
Notes due 2029 at 4.60%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			4.60%		4.60%
Notes due 2034 at 4.85%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			4.85%		4.85%
Notes due 2054 at 5.15%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			5.15%		5.15%
Notes due 2063 at 5.05%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			5.05%		5.05%
Senior unsecured notes
Debt Instrument [Line Items]
Number of series of debt issued | series		5
Principal amount		$ 3,000,000,000
Debt issuance costs		16,000,000
Proceeds from issuance of long-term debt		2,980,000,000
Senior unsecured notes | Notes due 2027 at 4.60%
Debt Instrument [Line Items]
Principal amount		$ 650,000,000
Long-term debt stated interest rate (in percentage)		4.60%
Senior unsecured notes | Notes due 2029 at 4.60%
Debt Instrument [Line Items]
Principal amount		$ 650,000,000
Long-term debt stated interest rate (in percentage)		4.60%
Senior unsecured notes | Notes due 2034 at 4.85%
Debt Instrument [Line Items]
Principal amount		$ 600,000,000
Long-term debt stated interest rate (in percentage)		4.85%
Senior unsecured notes | Notes due 2054 at 5.15%
Debt Instrument [Line Items]
Principal amount		$ 750,000,000
Long-term debt stated interest rate (in percentage)		5.15%
Senior unsecured notes | Notes due 2063 at 5.05%
Debt Instrument [Line Items]
Principal amount		$ 350,000,000
Long-term debt stated interest rate (in percentage)		5.05%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000		$ 1,000,000,000