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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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