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Financing arrangements (Interest Rate Swaps Textual) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Net cash provided by operating activities | $ 2,134 | $ 1,845 |
Repayments of Long-term Debt | $ 3,250 | $ 1,000 |
4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Rate difference in an interest rate swap relationship | 1.50% |  |
Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount | $ 5,000 |  |
Notes [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 3.625% |  |
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 2.60% |  |
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 4.663% |  |
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 3.625% |  |
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage | 3.125% |  |
Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notional amounts | $ 4,900 |  | $ 5,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notional amounts | 7,400 |  | $ 9,600
Value of derivative contracts terminated | 2,200 |  |
Net cash provided by operating activities | 576 |  |
$2.2 Billion Notional Value Interest Rate Swap [Member] | Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Value of derivative contracts terminated | 2,200 |  |
$5.2 Billion Notional Value Interest Rate Swap, Original [Member] | Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Value of derivative contracts terminated | 5,200 |  |
$5.2 Billion Notional Value Interest Rate Swap [Member] | Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notional amounts | $ 5,200 |  |

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