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Income Taxes (Unrecognized Tax Benefit Changes) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 45.10% | 23.20% |  | (31.50%) | 13.40% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent |  |  |  | 27.60% |  |
Effective income tax reconciliation, update to the forecasted AETR impact | 15.90% |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in State and Foreign Tax Rates, Percent | 17.40% |  |  |  |  |
Effective Income Tax Rate Reconciliation, Deferred Tax Assets, Percent |  |  |  | 16.30% |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent | 61.10% |  |  | 9.50% |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent |  |  |  | 8.30% |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent | 5.90% |  |  | 0.20% |  |
Unrecognized Tax Benefits, Period Decrease | $ 440 |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | 240 |  |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 12 |  |  | $ 11 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 138 |  |  | 138 |  |
Forecast [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  |  |  |  | $ 25
Minimum [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change | 200 |  |  | 200 |  |
Minimum [Member] | Forecast [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  | $ 75 |  |  |
Maximum [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change | $ 300 |  |  | $ 300 |  |
Maximum [Member] | Forecast [Member] |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  |  | $ 125 |  |  |

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