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Financing arrangements - Schedule of Borrowings (Details) $ in Millions | Mar. 31, 2024 USD ($) | Mar. 31, 2024 EUR (€) | Mar. 31, 2024 GBP (£) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Unamortized bond discounts, premiums and issuance costs, net | $ (1,404) |  |  | $ (1,420)
Fair value adjustments | (363) |  |  | (314)
Other | 33 |  |  | 17
Total carrying value of debt | 64,020 |  |  | 64,613
Less current portion | (3,959) |  |  | (1,443)
Total long-term debt | $ 60,061 |  |  | 63,170
Notes | 3.625% notes due 2024 (3.625% 2024 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.625% | 3.625% | 3.625% |
Long-term debt, gross | $ 1,400 |  |  | 1,400
Notes | 1.90% notes due 2025 (1.90% 2025 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 1.90% | 1.90% | 1.90% |
Long-term debt, gross | $ 500 |  |  | 500
Notes | 5.25% notes due 2025 (5.25% 2025 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.25% | 5.25% | 5.25% |
Long-term debt, gross | $ 2,000 |  |  | 2,000
Notes | 3.125% notes due 2025 (3.125% 2025 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.125% | 3.125% | 3.125% |
Long-term debt, gross | $ 1,000 |  |  | 1,000
Notes | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00% |
Face amount | € |  | € 750,000,000 |  |
Long-term debt, gross | $ 809 |  |  | 828
Notes | 5.507% notes due 2026 (5.507% 2026 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.507% | 5.507% | 5.507% |
Long-term debt, gross | $ 1,500 |  |  | 1,500
Notes | 2.60% notes due 2026 (2.60% 2026 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.60% | 2.60% | 2.60% |
Long-term debt, gross | $ 1,250 |  |  | 1,250
Notes | 5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50% |
Face amount | £ |  |  | £ 475,000,000 |
Long-term debt, gross | $ 600 |  |  | 605
Notes | 2.20% notes due 2027 (2.20% 2027 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.20% | 2.20% | 2.20% |
Long-term debt, gross | $ 1,724 |  |  | 1,724
Notes | 3.20% notes due 2027 (3.20% 2027 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.20% | 3.20% | 3.20% |
Long-term debt, gross | $ 1,000 |  |  | 1,000
Notes | 5.15% notes due 2028 (5.15% 2028 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.15% | 5.15% | 5.15% |
Long-term debt, gross | $ 3,750 |  |  | 3,750
Notes | 1.65% notes due 2028 (1.65% 2028 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 1.65% | 1.65% | 1.65% |
Long-term debt, gross | $ 1,234 |  |  | 1,234
Notes | 3.00% notes due 2029 (3.00% 2029 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.00% | 3.00% | 3.00% |
Long-term debt, gross | $ 750 |  |  | 750
Notes | 4.05% notes due 2029 (4.05% 2029 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.05% | 4.05% | 4.05% |
Long-term debt, gross | $ 1,250 |  |  | 1,250
Notes | 4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.00% | 4.00% | 4.00% |
Face amount | £ |  |  | £ 700,000,000 |
Long-term debt, gross | $ 884 |  |  | 892
Notes | 2.45% notes due 2030 (2.45% 2030 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.45% | 2.45% | 2.45% |
Long-term debt, gross | $ 1,250 |  |  | 1,250
Notes | 5.25% notes due 2030 (5.25% 2030 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.25% | 5.25% | 5.25% |
Long-term debt, gross | $ 2,750 |  |  | 2,750
Notes | 2.30% notes due 2031 (2.30% 2031 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.30% | 2.30% | 2.30% |
Long-term debt, gross | $ 1,250 |  |  | 1,250
Notes | 2.00% notes due 2032 (2.00% 2032 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00% |
Long-term debt, gross | $ 1,001 |  |  | 1,001
Notes | 3.35% notes due 2032 (3.35% 2032 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.35% | 3.35% | 3.35% |
Long-term debt, gross | $ 1,000 |  |  | 1,000
Notes | 4.20% notes due 2033 (4.20% 2033 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.20% | 4.20% | 4.20% |
Long-term debt, gross | $ 750 |  |  | 750
Notes | 5.25% notes due 2033 (5.25% 2033 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.25% | 5.25% | 5.25% |
Long-term debt, gross | $ 4,250 |  |  | 4,250
Notes | 6.375% notes due 2037 (6.375% 2037 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.375% | 6.375% | 6.375% |
Long-term debt, gross | $ 478 |  |  | 478
Notes | 6.90% notes due 2038 (6.90% 2038 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.90% | 6.90% | 6.90% |
Long-term debt, gross | $ 254 |  |  | 254
Notes | 6.40% notes due 2039 (6.40% 2039 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 6.40% | 6.40% | 6.40% |
Long-term debt, gross | $ 333 |  |  | 333
Notes | 3.15% notes due 2040 (3.15% 2040 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.15% | 3.15% | 3.15% |
Long-term debt, gross | $ 1,768 |  |  | 1,803
Notes | 5.75% notes due 2040 (5.75% 2040 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.75% | 5.75% | 5.75% |
Long-term debt, gross | $ 373 |  |  | 373
Notes | 2.80% notes due 2041 (2.80% 2041 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.80% | 2.80% | 2.80% |
Long-term debt, gross | $ 828 |  |  | 949
Notes | 4.95% notes due 2041 (4.95% 2041 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.95% | 4.95% | 4.95% |
Long-term debt, gross | $ 600 |  |  | 600
Notes | 5.15% notes due 2041 (5.15% 2041 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.15% | 5.15% | 5.15% |
Long-term debt, gross | $ 729 |  |  | 729
Notes | 5.65% notes due 2042 (5.65% 2042 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.65% | 5.65% | 5.65% |
Long-term debt, gross | $ 415 |  |  | 415
Notes | 5.60% notes due 2043 (5.60% 2043 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.60% | 5.60% | 5.60% |
Long-term debt, gross | $ 2,750 |  |  | 2,750
Notes | 5.375% notes due 2043 (5.375% 2043 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.375% | 5.375% | 5.375% |
Long-term debt, gross | $ 185 |  |  | 185
Notes | 4.40% notes due 2045 (4.40% 2045 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.40% | 4.40% | 4.40% |
Long-term debt, gross | $ 2,250 |  |  | 2,250
Notes | 4.563% notes due 2048 (4.563% 2048 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.563% | 4.563% | 4.563% |
Long-term debt, gross | $ 1,415 |  |  | 1,415
Notes | 3.375% notes due 2050 (3.375% 2050 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.375% | 3.375% | 3.375% |
Long-term debt, gross | $ 1,914 |  |  | 2,132
Notes | 4.663% notes due 2051 (4.663% 2051 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.663% | 4.663% | 4.663% |
Long-term debt, gross | $ 3,541 |  |  | 3,541
Notes | 3.00% notes due 2052 (3.00% 2052 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 3.00% | 3.00% | 3.00% |
Long-term debt, gross | $ 919 |  |  | 999
Notes | 4.20% notes due 2052 (4.20% 2052 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.20% | 4.20% | 4.20% |
Long-term debt, gross | $ 895 |  |  | 950
Notes | 4.875% notes due 2053 (4.875% 2053 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.875% | 4.875% | 4.875% |
Long-term debt, gross | $ 1,000 |  |  | 1,000
Notes | 5.65% notes due 2053 (5.65% 2053 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.65% | 5.65% | 5.65% |
Long-term debt, gross | $ 4,250 |  |  | 4,250
Notes | 2.77% notes due 2053 (2.77% 2053 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 2.77% | 2.77% | 2.77% |
Long-term debt, gross | $ 940 |  |  | 940
Notes | 4.40% notes due 2062 (4.40% 2062 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.40% | 4.40% | 4.40% |
Long-term debt, gross | $ 1,165 |  |  | 1,200
Notes | 5.75% notes due 2063 (5.75% 2063 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.75% | 5.75% | 5.75% |
Long-term debt, gross | $ 2,750 |  |  | 2,750
Notes | Other notes due 2097 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 100 |  |  | 100
Secured Debt | Term Loan Due April 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 2,000 |  |  | 2,000
Secured Debt | Term Loan Due October 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 2,000 |  |  | $ 2,000

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