Financing arrangements - Schedule of Borrowings (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Unamortized bond discounts, premiums and issuance costs, net	$ (1,360)			$ (1,420)
Fair value adjustments	(343)			(314)
Other	24			17
Total carrying value of debt	60,099			64,613
Less current portion	(3,550)			(1,443)
Total long-term debt	56,549			63,170
Notes
Debt Instrument [Line Items]
Principal Amount	0				$ 24,000	$ 7,000
Total principal amount of debt	61,778			66,330
Total carrying value of debt	$ 58,300			60,600
3.625% notes due 2024 (3.625% 2024 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%	3.625%	3.625%
Total principal amount of debt	$ 0			1,400
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	$ 500			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%
Principal Amount					2,000
Total principal amount of debt	$ 2,000			2,000
Term loan due April 2025 | Secured Debt
Debt Instrument [Line Items]
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	$ 1,000			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	$ 777			828
5.507% notes due 2026 (5.507% 2026 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%	5.507%	5.507%
Principal Amount					1,500
Total principal amount of debt	$ 1,500			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			2,000
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	$ 595			605
2.20% notes due 2027 (2.20% 2027 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%	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%
Principal Amount					3,750
Total principal amount of debt	$ 3,750			3,750
1.65% notes due in 2028 (1.65% 2028 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%	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%			3.00%
Principal Amount						$ 750
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%			4.05%
Principal Amount						$ 1,250
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	$ 876			892
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%
Principal Amount					2,750
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%	2.00%		2.00%
Total principal amount of debt	$ 1,001			$ 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%			3.35%
Principal Amount						$ 1,000
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%			4.20%
Principal Amount						$ 750
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%
Principal Amount					4,250
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	$ 1,668			$ 1,803
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%		2.80%
Total principal amount of debt	$ 776			$ 949
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%
Principal Amount					2,750
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	$ 1,764			$ 2,132
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%		3.00%
Total principal amount of debt	$ 890			$ 999
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%		4.20%
Principal Amount						$ 1,000
Total principal amount of debt	$ 895			$ 950
4.875% notes due 2053 (4.875% 2053 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.875%	4.875%	4.875%			4.875%
Principal Amount						$ 1,000
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%
Principal Amount					4,250
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%		4.40%
Principal Amount						$ 1,250
Total principal amount of debt	$ 1,165			$ 1,200
5.75% notes due 2063 (5.75% 2063 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%	5.75%
Principal Amount					$ 2,750
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