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Income taxes (Textual) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income taxes paid | $ 1,900,000,000 | $ 1,500,000,000 | $ 1,100,000,000
Tax Credit Carryforward [Line Items] |  |  |
Interest and penalties related to unrecognized tax benefits recognized in income tax provision | 137,000,000 | 56,000,000 | $ 125,000,000
Accrued interest and penalties associated with unrecognized tax benefits | 469,000,000 | $ 332,000,000 |
Federal [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 | 145,000,000 |  |
NOL carryforwards, valuation allowance | 6,000,000 |  |
Federal [Member] | Operating Losses That Expire Between 2020 and 2035 [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards, valuation allowance | 0 |  |
State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforwards available to reduce income taxes | 556,000,000 |  |
Tax credit carryforwards, valuation allowance | 444,000,000 |  |
NOL carryforwards available to reduce income taxes | 287,000,000 |  |
NOL carryforwards, valuation allowance | 263,000,000 |  |
State [Member] | Expiration in tax years beginning 2022 [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforwards, valuation allowance | 0 |  |
State [Member] | Operating Losses That Expire Between 2019 and 2032 [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards, valuation allowance | 0 |  |
Foreign [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
NOL carryforwards available to reduce income taxes | 1,800,000,000 |  |
NOL carryforwards, valuation allowance | 485,000,000 |  |
NOLs with no valuation allowance and no expiration | 620,000,000 |  |
Foreign [Member] | Operating Losses With No Expiry [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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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