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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, shares in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) | May 31, 2020 USD ($) shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) agreement shares | Sep. 30, 2020 USD ($) | Nov. 30, 2021 shares | May 01, 2020 shares | Sep. 24, 2013 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  | 10,000
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased |  |  |  |  |  | 10,000 |  |
Other comprehensive loss before reclassifications, net of taxes | $ |  |  | $ 306,000,000 | $ 383,000,000 | $ (338,000,000) |  |  |
Accelerated Share Repurchase Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Total Shares to be Delivered Under Accelerated Share Repurchase Program |  |  | 1,953 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  | $ 500,000,000 | $ 1,250,000,000 |  |  |  |
Number of Transactions | agreement |  |  |  | 2 |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 462 | 4,577 |  |  |  |
Open Market Repurchases |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 2,066 |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  |  | $ 650,000,000 | $ 1,600,000,000 |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 2,415 | 6,643 |  |  |  |
Treasury Stock | Accelerated Share Repurchase Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  |  | $ 150,000,000 | $ 1,100,000,000 |  |  |  |
Treasury Stock | Open Market Repurchases |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  |  |  | 500,000,000 |  |  |  |
Benefit Plans |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Other comprehensive loss before reclassifications, net of taxes | $ | $ 24,000,000 |  | $ 169,000,000 | $ 187,000,000 | $ (101,000,000) |  |  |
Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  | 5,300 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  | 6,400 |  |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  | 2,475 |
Stock Issued During Period, Shares, New Issues |  | 1,500 |  |  |  |  |  |
Gross Proceeds from Issuance of Equity | $ |  | $ 1,500,000,000 |  |  |  |  |  |
Preferred Stock, Depositary Share Ownership Interest, Percentage |  | 5.00% |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 1,459,000,000 |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 6.00% |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  |  | $ 1,000 |  |  |  |  |
Depositary Share Liquidation | $ |  |  | $ 50 |  |  |  |  |
Common Stock Issued at Par Value |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  |  | 11,703 |
Stock Issued During Period, Shares, New Issues |  | 6,250 |  |  |  |  |  |
Gross Proceeds from Issuance of Equity | $ |  | $ 1,500,000,000 |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 1,459,000,000 |  |  |  |  |  |

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