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Financing arrangements (Debt Repayments) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Repayments of short-term debt | $ 605,000,000 |  |
Repayments of debt | 4,405,000,000 | $ 3,725,000,000 | $ 2,400,000,000
2.125% notes due 2017 (2.125% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt | $ 1,250,000,000 |  |
Stated contractual interest rate on note | 2.125% |  |
Floating rate notes due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt | $ 600,000,000 |  |
1.25% notes due 2017 (1.25% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt | $ 850,000,000 |  |
Stated contractual interest rate on note | 1.25% |  |
5.85% notes due 2017 (5.85% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt | $ 1,100,000,000 |  |
Stated contractual interest rate on note | 5.85% |  |
Term loan due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt |  | 1,975,000,000 | $ 2,400,000,000
2.30% notes due 2016 (2.30% 2016 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt |  | $ 750,000,000 |
Stated contractual interest rate on note |  | 2.30% |
2.50% notes due 2016 (2.50% 2016 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt |  | $ 1,000,000,000.0 |
Stated contractual interest rate on note |  | 2.50% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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