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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate, continuing operations (in percent) | 6.00% |  |  | 44.60% | 31.70%
Restructuring, merger, acquisition and divestiture expense |  |  |  | $ 94 |
Restructuring, merger, acquisition, divestiture expenses, and asset impairment costs | $ 75 |  |  |  |
Tax benefit recognized on restructuring expense |  |  |  | 9 | $ 7
Asset impairments | 17 | $ 0 |  | 26 | 0
Tax benefits related to other one-time adjustments |  |  |  | $ 10 | 5
Tax benefits recognized | $ 5 |  |  |  |
Tax benefits related to postretirement expenses |  |  |  |  | $ 6
Tax benefits related to Tax Act |  |  | $ 22 |  |

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- Definition Effective Income Tax Rate Reconciliation, Nondeductible Expense, Postretirement Expenses, Amount + References No definition available. + Details
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