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Income Taxes (Unaudited) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2020 | Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2021
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |
U.S. operations |  |  |  |  | $ 56 | $ 73 |
International operations |  |  |  |  | (389) | (254) |
Total |  |  | $ (297) | $ (91) | (333) | (181) |
Tax charge resulting from prior period tax positions |  |  |  |  | 21 |  |
Tax charge resulting from prior period tax positions, net noncontrolling interests |  |  |  |  | $ 17 |  |
Tax charge resulting from prior period deferred tax positions |  |  |  |  |  | $ 49 |
Consolidated effective income tax rate (percent) |  |  |  |  | 102.00% | 302.00% |
Proceeds from Income Tax Refunds |  | $ 221 |  |  |  |  |
Forecast |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |
Proceeds from Income Tax Refunds |  |  |  |  |  |  | $ 23
Foreign Tax Authority [Member] |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |
Tax credit |  |  |  |  | $ 53 |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |
Tax credit |  |  |  |  |  | $ 24 |
Subsequent event |  |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |  |
Proceeds from Income Tax Refunds | $ 24 |  |  |  |  |  |

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