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Financing arrangements (Debt Issuances) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Commercial paper, maximum borrowing capacity | $ 2,500,000,000 |
Notes [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued | 5,000,000,000 | $ 9,000,000,000
Notes [Member] | 1.65% notes due in 2028 (1.65% 2028 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued | $ 1,250,000,000 |
Interest rate, stated percentage | 1.65% |
Notes [Member] | 2.00% notes due 2032 (2.00% 2032 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued | $ 1,250,000,000 |
Interest rate, stated percentage | 2.00% |
Notes [Member] | 2.80% notes due 2041 (2.80% 2041 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued | $ 1,150,000,000 |
Interest rate, stated percentage | 2.80% |
Notes [Member] | 3.00% notes due 2052 (3.00% 2052 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued | $ 1,350,000,000 |
Interest rate, stated percentage | 3.00% |
Notes [Member] | 1.90% notes due 2025 (1.90% 2025 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued |  | $ 500,000,000
Interest rate, stated percentage | 1.90% | 1.90%
Notes [Member] | 2.20% notes due 2027 (2.20% 2027 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued |  | $ 1,750,000,000
Interest rate, stated percentage | 2.20% | 2.20%
Notes [Member] | 2.45% notes due 2030 (2.45% 2030 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued |  | $ 1,250,000,000
Interest rate, stated percentage | 2.45% | 2.45%
Notes [Member] | 2.30% notes due 2031 (2.30% 2031 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued |  | $ 1,250,000,000
Interest rate, stated percentage | 2.30% | 2.30%
Notes [Member] | 3.15% notes due 2040 (3.15% 2040 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued |  | $ 2,000,000,000
Interest rate, stated percentage | 3.15% | 3.15%
Notes [Member] | 3.375% notes due 2050 (3.375% 2050 Notes) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued |  | $ 2,250,000,000
Interest rate, stated percentage | 3.375% | 3.375%

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