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Financing arrangements - Schedule of Borrowings (Details) $ in Millions	Sep. 30, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Sep. 30, 2025 GBP (£)	Dec. 31, 2024 USD ($)	Sep. 30, 2024
Debt Instrument [Line Items]
Unamortized bond discounts, premiums and issuance costs, net	$ (1,317)			$ (1,360)
Fair value adjustments	(159)			(343)
Other	24			24
Total carrying value of debt	54,587			60,099
Less current portion	(2,153)			(3,550)
Total long-term debt	52,434			56,549
Notes
Debt Instrument [Line Items]
Total principal amount of debt	56,039			61,778
Total carrying value of debt	$ 52,800			58,300
1.90% notes due 2025 (1.90% 2025 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.90%	1.90%	1.90%
Total principal amount of debt	$ 0			500
5.25% notes due 2025 (5.25% 2025 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%	5.25%	5.25%
Total principal amount of debt	$ 0			2,000
3.125% notes due 2025 (3.125% 2025 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%	3.125%	3.125%
Total principal amount of debt	$ 0			1,000
2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%	2.00%	2.00%
Principal amount | €		€ 750,000,000
Total principal amount of debt	$ 880			777
5.507% notes due 2026 (5.507% 2026 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%	5.507%	5.507%
Total principal amount of debt	$ 0			1,500
2.60% notes due 2026 (2.60% 2026 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%	2.60%	2.60%
Total principal amount of debt	$ 1,250			1,250
Term loan due October 2026 | Secured Debt
Debt Instrument [Line Items]
Total principal amount of debt	$ 1,800			1,800
5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%	5.50%	5.50%
Principal amount | £			£ 475,000,000
Total principal amount of debt	$ 639			595
2.20% notes due 2027 (2.20% 2027 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%	2.20%	2.20%
Total principal amount of debt	$ 1,724			1,724
3.20% notes due 2027 (3.20% 2027 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.20%	3.20%	3.20%
Total principal amount of debt	$ 1,000			1,000
5.15% notes due 2028 (5.15% 2028 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%	5.15%	5.15%
Total principal amount of debt	$ 3,750			3,750
1.65% notes due 2028 (1.65% 2028 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%	1.65%	1.65%
Total principal amount of debt	$ 1,234			1,234
3.00% notes due 2029 (3.00% 2029 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%	3.00%
Total principal amount of debt	$ 750			750
4.05% notes due 2029 (4.05% 2029 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.05%	4.05%	4.05%
Total principal amount of debt	$ 1,250			1,250
4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%	4.00%	4.00%
Principal amount | £			£ 700,000,000
Total principal amount of debt	$ 941			876
2.45% notes due 2030 (2.45% 2030 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.45%	2.45%	2.45%
Total principal amount of debt	$ 1,250			1,250
5.25% notes due 2030 (5.25% 2030 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%	5.25%	5.25%
Total principal amount of debt	$ 2,750			2,750
2.30% notes due 2031 (2.30% 2031 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.30%	2.30%	2.30%
Total principal amount of debt	$ 1,250			1,250
2.00% notes due 2032 (2.00% 2032 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%	2.00%	2.00%
Total principal amount of debt	$ 987			1,001
3.35% notes due 2032 (3.35% 2032 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.35%	3.35%	3.35%
Total principal amount of debt	$ 1,000			1,000
4.20% notes due 2033 (4.20% 2033 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%	4.20%	4.20%
Total principal amount of debt	$ 750			750
5.25% notes due 2033 (5.25% 2033 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%	5.25%	5.25%
Total principal amount of debt	$ 4,250			4,250
6.375% notes due 2037 (6.375% 2037 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.375%	6.375%	6.375%
Total principal amount of debt	$ 478			478
6.90% notes due 2038 (6.90% 2038 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.90%	6.90%	6.90%
Total principal amount of debt	$ 254			254
6.40% notes due 2039 (6.40% 2039 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	6.40%	6.40%	6.40%
Total principal amount of debt	$ 333			333
3.15% notes due 2040 (3.15% 2040 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%	3.15%	3.15%		3.15%
Total principal amount of debt	$ 1,478			1,668
5.75% notes due 2040 (5.75% 2040 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%	5.75%
Total principal amount of debt	$ 373			373
2.80% notes due 2041 (2.80% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%	2.80%	2.80%		2.80%
Total principal amount of debt	$ 568			776
4.95% notes due 2041 (4.95% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%	4.95%	4.95%
Total principal amount of debt	$ 600			600
5.15% notes due 2041 (5.15% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%	5.15%	5.15%
Total principal amount of debt	$ 729			729
5.65% notes due 2042 (5.65% 2042 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%	5.65%	5.65%
Total principal amount of debt	$ 415			415
5.60% notes due 2043 (5.60% 2043 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.60%	5.60%	5.60%
Total principal amount of debt	$ 2,750			2,750
5.375% notes due 2043 (5.375% 2043 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%	5.375%	5.375%
Total principal amount of debt	$ 185			185
4.40% notes due 2045 (4.40% 2045 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%	4.40%	4.40%
Total principal amount of debt	$ 2,250			2,250
4.563% notes due 2048 (4.563% 2048 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.563%	4.563%	4.563%
Total principal amount of debt	$ 1,415			1,415
3.375% notes due 2050 (3.375% 2050 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.375%	3.375%	3.375%		3.375%
Total principal amount of debt	$ 1,462			1,764
4.663% notes due 2051 (4.663% 2051 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.663%	4.663%	4.663%
Total principal amount of debt	$ 3,541			3,541
3.00% notes due 2052 (3.00% 2052 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%	3.00%		3.00%
Total principal amount of debt	$ 703			890
4.20% notes due 2052 (4.20% 2052 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%	4.20%	4.20%		4.20%
Total principal amount of debt	$ 882			895
4.875% notes due 2053 (4.875% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.875%	4.875%	4.875%
Total principal amount of debt	$ 1,000			1,000
5.65% notes due 2053 (5.65% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%	5.65%	5.65%
Total principal amount of debt	$ 4,250			4,250
2.77% notes due 2053 (2.77% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.77%	2.77%	2.77%
Total principal amount of debt	$ 940			940
4.40% notes due 2062 (4.40% 2062 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%	4.40%	4.40%		4.40%
Total principal amount of debt	$ 1,128			1,165
5.75% notes due 2063 (5.75% 2063 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%	5.75%
Total principal amount of debt	$ 2,750			2,750
Other notes due 2097 | Notes
Debt Instrument [Line Items]
Total principal amount of debt	$ 100			$ 100

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