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Income Taxes - Tax Effected Operating Loss, Capital Loss, and Tax Credit Carryovers (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax |  |  |  |
Net UTB impacting the effective tax rate | $ 526 | $ 655 | $ 526 | $ 333
Interest and penalties related to unrecognized tax benefits, expense (benefit) recognized on a gross basis |  | 12 | 20 | $ 10
Interest and penalties related to unrecognized tax benefits, accrued on a gross basis | 68 | 69 | 68 |
Deferred tax assets valuation allowance | 81 | $ 67 | $ 81 |
Effective tax rate (as a percent) |  | 23.40% | 35.50% | 28.30%
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent) |  | (12.10%) | 7.20% |
Statutory U.S. tax rate |  | 21.00% | 35.00% | 35.00%
Provisional income tax expense (benefit) from enactment of Tax Cuts and Jobs Act of 2017 | 762 |  |  |
Tax Cuts and Jobs Act of 2017 measurement period adjustment |  | $ 176 |  |
Provisional transition tax expense (benefit) for accumulated foreign earnings from enactment of Tax Cuts and Jobs Act of 2017 | 745 | 97 |  |
Provisional expense (benefit) from remeasurement of deferred tax assets and liabilities due to change in tax rate from enactment of Tax Cuts and Jobs Act of 2017 | $ 17 | $ 79 |  |
Period of time over which TCJA transition tax on certain unrepatriated earnings of foreign subsidiaries may be paid |  | 8 years |  |
Tax Cuts and Jobs Act of 2017 transition tax long term income taxes payable |  | $ 649 |  |

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- Definition Carrying amount specific to the Tax Cuts and Jobs act of 2017 as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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