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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Income Tax Information [Line Items] |  |  |  |  |  |
Federal statutory rate |  |  | 21.00% |  |  | 35.00%
Net income tax expense (benefit), tax reform |  | $ (43) | $ (193) |  |  |
Net income tax expense (benefit), tax reform, per diluted share |  | $ (0.07) | $ (0.30) |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  | $ (98) |  |  |  |
Income tax expense (benefit), repatriation of foreign earnings and withholding taxes |  | 185 |  |  |  |
Income tax expense (benefit) for repatriation of foreign earnings, prior periods |  | $ (130) |  |  |  |
Income tax expense (benefit) due to increase in foreign tax credit carryforwards | $ (150) |  |  |  |  |
Income tax expense (benefit) due to increase in foreign tax credit carryforwards, per diluted share | $ (0.24) |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Schedule of Income Tax Information [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  |  | 25.00% | 19.00% |
Effective income tax rate, tax reform impact |  |  |  |  | 7.00% |

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