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Financing arrangements (Debt Issuances) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Commercial paper, maximum borrowing capacity |  | $ 2,500,000,000
Commercial paper issued | $ 12,300,000,000 |
Commercial paper repaid | 12,300,000,000 |
Commercial paper, maximum outstanding | 1,500,000,000 |
Notes [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount of notes issued | $ 4,500,000,000 |
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 1.90% | 1.90%
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.20% | 2.20%
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 2.65% | 2.65%
Notes [Member] | 3.20% notes due 2027 (3.20% 2027 Notes) [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 3.20% | 3.20%

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- Definition Maximum Borrowing Capacity Under Commercial Paper Program. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 The cash inflow from borrowing by issuing commercial paper. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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