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Stockholders' equity (Details Textual) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 30, 2018 | Jan. 31, 2018
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000.0 | $ 10,000,000,000.0
Number of shares repurchased | 52.1 |  |  |  |  |  |  | 8.7 | 18.2 | 56.4 | 4.4 | 6.2 | 3.4 | 83.4 | 14.0 |  |
Stock repurchase program, tender offer amount |  |  |  |  |  |  |  |  |  | $ 10,000,000,000 |  |  |  |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan |  |  | $ 3,700,000,000 |  |  |  |  | $ 3,700,000,000 |  |  |  |  |  | $ 3,700,000,000 |  |  |
Dividends paid per share (in usd per share) |  |  | $ 1.32 |  | $ 1.32 | $ 1.32 |  | $ 1.32 |  |  | $ 1.15 |  |  | $ 3.96 | $ 3.45 |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) |  |  |  | $ 1.32 |  | $ 1.32 | $ 1.32 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) |  | $ 1.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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