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Income Taxes - Future Tax Benefits (Details) $ in Millions | Mar. 31, 2018 USD ($)
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Foreign tax credit carryover | Expiring within Tax Years 2023 to 2024 |
Tax Credit Carryforward [Line Items] |
Tax credit carryover, Carryover amount | $ 21
Foreign tax credit credit carryover, Expected tax benefit, gross | 21
General business credit carryover |
Tax Credit Carryforward [Line Items] |
Tax credit carryover, Carryover amount | 3
General business credit carryover, Expected tax benefit, gross | 3
General business credit carryover | Expiring Tax Year 2031 to 2037 |
Tax Credit Carryforward [Line Items] |
General business credit carryover, Expected tax benefit, gross | 3
U.S. |
Tax Credit Carryforward [Line Items] |
Operating Loss Carryforwards | 3,087
Net operating loss carryover, Expected tax benefit, gross | 648
U.S. | Expiring Tax Year 2020 |
Tax Credit Carryforward [Line Items] |
Operating Loss Carryforwards | 1
U.S. | Expiring within Tax Years 2023 to 2036 |
Tax Credit Carryforward [Line Items] |
Operating Loss Carryforwards | 3,086
Foreign |
Tax Credit Carryforward [Line Items] |
Operating Loss Carryforwards | 4
Net operating loss carryover, Expected tax benefit, gross | 0
Foreign | No expiration tax year |
Tax Credit Carryforward [Line Items] |
Operating Loss Carryforwards | $ 4

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