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Stockholders' equity (Shares Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 06, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 05, 2018 | Jan. 31, 2018
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock repurchases, Shares |  | 4.5 | 4.4 | 6.2 | 3.4 | 6.7 | 4.4 | 3.9 | 4.7 | 1.2 | 4.6 | 3.3 | 2.9 | 18.5 | 19.7 | 12.0 |  |
Total stock repurchases |  | $ 796,000,000 | $ 769,000,000 | $ 1,006,000,000 | $ 555,000,000 | $ 999,000,000 | $ 747,000,000 | $ 591,000,000 | $ 690,000,000 | $ 184,000,000 | $ 703,000,000 | $ 515,000,000 | $ 451,000,000 | $ 3,126,000,000 | $ 3,027,000,000 | $ 1,853,000,000 |  |
Amount available for stock repurchases under a board approved stock repurchase plan |  | $ 4,400,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000,000 |  |  |  |
Subsequent event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000,000.0
Stock repurchase program, tender offer amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000,000 |
Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, cost per share | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, cost per share | $ 175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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://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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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