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Stockholders' equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available for stock repurchases under a board approved stock repurchase plan | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  | $ 4,400 |  |
Common stock, dividends paid per share (in usd per share) | $ 1.15 | $ 1.15 | $ 1.15 | $ 1.15 | $ 1.00 | $ 1 | $ 1 | $ 1 | $ 0.79 | $ 0.79 | $ 0.79 | $ 0.79 |  |  |
Common stock, dividends declared per share (in usd per share) | $ 1.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes expense or (benefit) for unrealized gains and losses for cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  | 68 | $ (68) | $ 53
Income tax expense or (benefit) reclassification adjustments to income for cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  | (226) | 46 | (53)
Income taxes expense or (benefit) for unrealized gains and losses for available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 9 | (9) | 0
Income tax expense or (benefit) for reclassification adjustments to income for available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  | $ (8) | $ 11 | $ 18
Preferred stock shares authorized (in shares) | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Preferred stock, par value (in usd per share) | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |
Preferred stock, shares issued (in shares) | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |
Preferred stock, shares outstanding (in shares) | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: 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 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 + Details
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