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Financing arrangements - Miscellaneous (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt securities payable | Minimum
Debt Instrument [Line Items]
Redemption period without payment of make whole amount	1 month
Debt securities payable | Maximum
Debt Instrument [Line Items]
Redemption period without payment of make whole amount	6 months
3.625% notes due 2024 (3.625% 2024 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.00% notes due 2029 (3.00% 2029 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%		3.00%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.30% notes due 2031 (2.30% 2031 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.30%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.35% notes due 2032 (3.35% 2032 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.35%		3.35%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.20% notes due 2033 (4.20% 2033 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%		4.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
6.90% notes due 2038 (6.90% 2038 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.90%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
6.40% notes due 2039 (6.40% 2039 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.15% notes due 2040 (3.15% 2040 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%	3.15%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.563% notes due 2048 (4.563% 2048 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.563%
Effective interest rate on note	6.30%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.663% notes due 2051 (4.663% 2051 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.663%
Effective interest rate on note	5.60%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.77% notes due 2053 (2.77% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.77%
Effective interest rate on note	5.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.40% notes due 2045 (4.40% 2045 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.95% notes due 2041 (4.95% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.00% notes due 2052 (3.00% 2052 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%	3.00%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.375% notes due 2050 (3.375% 2050 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.375%	3.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.375% notes due 2043 (5.375% 2043 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.40% notes due 2062 (4.40% 2062 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%	4.40%	4.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.15% notes due 2041 (5.15% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.875% notes due 2053 (4.875% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.875%		4.875%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.125% notes due 2025 (3.125% 2025 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.75% notes due 2040 (5.75% 2040 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
6.375% notes due 2037 (6.375% 2037 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.60% notes due 2026 (2.60% 2026 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
1.65% notes due in 2028 (1.65% 2028 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%		1.65%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
3.20% notes due 2027 (3.20% 2027 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.65% notes due 2042 (5.65% 2042 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.20% notes due 2027 (2.20% 2027 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%		2.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.45% notes due 2030 (2.45% 2030 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.45%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.05% notes due 2029 (4.05% 2029 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.05%		4.05%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
4.20% notes due 2052 (4.20% 2052 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%	4.20%	4.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.507% Notes Due 2026 | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%
5.507% Notes Due 2026 | Debt securities payable
Debt Instrument [Line Items]
Redemption period without payment of make whole amount	2 years
1.90% notes due 2025 (1.90% 2025 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.90%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.25% notes due 2025 (5.25% 2025 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.507% notes due 2026 (5.507% 2026 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.15% notes due 2028 (5.15% 2028 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.25% notes due 2030 (5.25% 2030 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.00% notes due 2032 (2.00% 2032 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%	2.00%	2.00%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.25% notes due 2033 (5.25% 2033 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
2.80% notes due 2041 (2.80% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%	2.80%	2.80%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.60% notes due 2043 (5.60% 2043 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.60%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.65% notes due 2053 (5.65% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%
5.75% notes due 2063 (5.75% 2063 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event	101.00%

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