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Income Taxes Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019
U.S. Tax Cuts and Jobs Act |  |  |
U.S. Tax Reform Related Matters |  |  |
Discrete net tax expense |  | $ 82 |
Transition tax and remeasurement of deferred taxes |  |  |
U.S. Tax Reform Related Matters |  |  |
Discrete net tax expense | $ 26 |  |
Brazil Tax Matter |  |  |
U.S. Tax Reform Related Matters |  |  |
Proposed Tax Adjustments and Penalties, Foreign Tax Authority |  |  | $ 90

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