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Financing arrangements (Debt Exchange) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount of notes issued | $ 6,700 |  | $ 4,500
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount of notes issued | $ 1,400 |  |
Interest rate, stated percentage | 4.563% | 4.563% |
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount of notes issued | $ 3,500 |  |
Interest rate, stated percentage | 4.663% | 4.663% |
Debt securities payable [Member] | New senior notes [Member] | Nonoperating Income (Expense) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized bond discounts and issuance costs | $ 801 |  |
Debt related commitment fees and debt issuance costs | $ 24 |  |

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