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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
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017
Income tax |  |  |  |
Net UTB impacting the effective tax rate | $ 518 | $ 526 |  | $ 526
Interest and penalties related to unrecognized tax benefits, expense (benefit) recognized on a gross basis | 9 |  | $ 3 |
Interest and penalties related to unrecognized tax benefits, accrued on a gross basis | 69 | 68 |  | 68
Deferred Tax Assets, Valuation Allowance | $ 85 | 81 |  | $ 81
Effective tax rate (as a percent) | 37.20% |  | 23.70% |
Increase (decrease) in effective income tax rate from prior reporting period to current reporting period (as a percent) | 13.50% |  |  |
Impact of factors that decreased the effective tax rate from prior reporting period to current reporting period (as a percent) | 14.30% |  |  |
Impact of factors that increased the effective tax rate from prior reporting period to current reporting period (as a percent) | 27.80% |  |  |
Statutory U.S. tax rate | 21.00% |  |  | 35.00%
Provisional income tax expense (benefit) from enactment of Tax Cuts and Jobs Act of 2017 | $ 217 | 762 |  |
Provisional transition tax expense (benefit) for accumulated foreign earnings from enactment of Tax Cuts and Jobs Act of 2017 | 132 | 745 |  |
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 | $ 85 | $ 17 |  |
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 in current accrued income taxes payable | $ 144 |  |  |
Tax Cuts and Jobs Act of 2017 transition tax long term income taxes payable | $ 733 |  |  |

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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 currently due domestic and foreign income tax obligations. + References No definition available. + Details
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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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