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v3.20.1

Financing arrangements (Details Textual) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Debt Instrument [Line Items] |  |
Repayments of Long-term Debt | $ 3,250 | $ 1,000
Notes [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 5,000 |
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.563% |
Effective interest rate | 6.30% |
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.663% |
Effective interest rate | 5.60% |
Notes [Member] | Interest Expense [Member] |  |
Debt Instrument [Line Items] |  |
MakeWholePayments | $ 50 |
Notes [Member] | 1.90% notes due 2025 (1.90% 2025 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.90% |
Notes [Member] | 2.20% notes due 2027 (2.20% 2027 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.20% |
Notes [Member] | 2.45% notes due 2030 (2.45% 2030 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.45% |
Notes [Member] | 3.15% notes due 2040 (3.15% 2040 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.15% |
Notes [Member] | 3.375% notes due 2050 (3.375% 2050 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.375% |
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.45% |
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.10% |
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.85% |
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.875% |
Repayments of Long-term Debt | $ 300 |
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 4.50% |
Minimum [Member] | Debt Securities Payable [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Period without Payment of Make Whole Amount | 1 month |
Maximum [Member] | Debt Securities Payable [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Period without Payment of Make Whole Amount | 6 months |

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