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Income Taxes (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |
Effective income tax rate, continuing operations | 29.20% | 20.70%
Tax expense on gain from commercial settlement |  | $ 1
Tax benefits related to restructuring expense | $ 11 | 10
Effective rate reconciliation measurement period adjustments due to the Tax Act |  | 20
Effective income tax reconciliation, other postretirement expense | 6 |
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount | 13 | 11
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 22 |
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount |  | $ 22

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other postretirement expense. + References No definition available. + Details
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