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Financing arrangements (Schedule Interest Rate Swaps) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
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 Payable, Other Payables [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 7,350 | $ 9,550
Notes Payable, Other Payables [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 0 | $ 900
Interest rate, stated percentage | 3.45% |
Notes Payable, Other Payables [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 1.10% | 1.10%
Notes Payable, Other Payables [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 0 | $ 1,000
Interest rate, stated percentage | 4.10% |
Notes Payable, Other Payables [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 1.70% | 1.70%
Notes Payable, Other Payables [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 1,450 | $ 1,750
Interest rate, stated percentage | 3.875% |
Notes Payable, Other Payables [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 2.00% | 2.00%
Notes Payable, Other Payables [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 750 | $ 750
Interest rate, stated percentage | 3.625% |
Notes Payable, Other Payables [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 2.70% | 1.60%
Notes Payable, Other Payables [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 1,400 | $ 1,400
Interest rate, stated percentage | 3.625% |
Notes Payable, Other Payables [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 3.20% | 1.40%
Notes Payable, Other Payables [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 1,000 | $ 1,000
Interest rate, stated percentage | 3.125% |
Notes Payable, Other Payables [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 1.80% | 0.90%
Notes Payable, Other Payables [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 1,250 | $ 1,250
Interest rate, stated percentage | 2.60% |
Notes Payable, Other Payables [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 1.80% | 0.30%
Notes Payable, Other Payables [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Notional amounts | $ 1,500 | $ 1,500
Interest rate, stated percentage | 4.663% |
Notes Payable, Other Payables [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 2.60% | 0.00%

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