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Income taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tax Credit Carryforward [Line Items] |  |  |
Total U.S. repatriation tax commitments | $ 7,316,000,000 |  |
Remeasurement of net deferred and other tax liabilities, provisional income tax expense (benefit) | (1,200,000,000) |  |
Provisional income tax expense (benefit) | 6,100,000,000 |  |
Significant change in UTB is reasonably possible, amount of unrecorded benefit | 63,000,000 |  |
Interest and penalties related to unrecognized tax benefits recognized in income tax provision | 56,000,000 | $ 125,000,000 | $ 17,000,000
Accrued interest and penalties associated with unrecognized tax benefits | 332,000,000 | 276,000,000 |
Income taxes paid | $ 1,500,000,000 | $ 1,100,000,000 | $ 919,000,000
Puerto Rico [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax rate | 4.00% |  |
Domestic [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforwards available to reduce income taxes | $ 20,000,000 |  |
Tax credit carryforwards, valuation allowance | 0 |  |
NOL carryforwards available to reduce income taxes | 146,000,000 |  |
NOL carryforwards, valuation allowance | 6,000,000 |  |
State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforwards available to reduce income taxes | 524,000,000 |  |
Tax credit carryforwards, valuation allowance | 392,000,000 |  |
NOL carryforwards available to reduce income taxes | 425,000,000 |  |
NOL carryforwards, valuation allowance | 400,000,000 |  |
Foreign [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards available to reduce income taxes | 2,000,000,000 |  |
NOL carryforwards, valuation allowance | 819,000,000 |  |
NOLs with no valuation allowance and no expiration | 678,000,000 |  |
Expiration in tax years beginning 2022 [Member] | State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforwards, valuation allowance | 0 |  |
Operating Losses That Expire Between 2020 and 2035 [Member] | Domestic [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards, valuation allowance | 0 |  |
Operating Losses That Expire Between 2018 and 2032 [Member] | State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards, valuation allowance | 0 |  |
Operating Losses With No Expiry or Expiry Beginning 2018 [Member] | Foreign [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards, valuation allowance | $ 0 |  |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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