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U.S. and Europe Retrospective Responsibility Plan Changes in Preferred Stock and Right to Recover Covered Losses (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Jun. 21, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |
Beginning Balance |  |  |  | $ 32,912 | $ 29,842 |
VE Territory Covered Losses Incurred (Note 14) |  |  |  | (209) | (34) |
Ending Balance | $ 32,760 |  | $ 32,912 | 32,760 | 32,912 |
Preferred Stock Available to Recover Covered Losses, Value, As-converted | 8,048 |  | 6,504 | 8,048 | 6,504 |
Preferred Stock Available to Recover Covered Losses, Value | 5,526 |  | 5,717 | 5,526 | 5,717 |
Right to recover for covered losses | (52) |  | (34) | (52) | (34) | $ (25)
Preferred Stock Available to Recover Covered Losses, Value, As-converted, Net | 7,996 |  | 6,470 | 7,996 | 6,470 |
Preferred Stock Available to Recover Covered Losses, Value, Net | $ 5,474 |  | $ 5,683 | $ 5,474 | $ 5,683 |
Closing Stock Price | $ / shares | $ 105.24 |  |  | $ 105.24 |  |
Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares outstanding | shares | 5,000,000 |  | 5,000,000 | 5,000,000 | 5,000,000 |
Series B Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  | $ 190 |  |
Preferred Stock Available to Recover Covered Losses, Value, As-converted | $ 3,414 |  | $ 2,862 | 3,414 | $ 2,862 |
Preferred stock | $ 2,326 |  | $ 2,516 | $ 2,326 | $ 2,516 |
Preferred stock, shares outstanding | shares | 2,000,000 |  | 2,000,000 | 2,000,000 | 2,000,000 |
Preferred stock, conversion rate | 13.0770 | [1] | 13.952 |  |  |
Series C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  | $ 1 |  |
Preferred Stock Available to Recover Covered Losses, Value, As-converted | $ 4,634 |  | $ 3,642 | 4,634 | $ 3,642 |
Preferred stock | $ 3,200 |  | $ 3,201 | $ 3,200 | $ 3,201 |
Preferred stock, shares outstanding | shares | 3,000,000 |  | 3,000,000 | 3,000,000 | 3,000,000 |
Preferred stock, conversion rate | 13.9480 |  | 13.952 |  |  |
Class A common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Closing Stock Price | $ / shares | $ 105.24 |  | $ 82.70 | $ 105.24 | $ 82.70 |
Right to Recover for Covered Losses |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Beginning Balance |  |  |  | $ (34) | $ 0 |
VE Territory Covered Losses Incurred (Note 14) |  |  |  | (209) | (34) |
Recovery through conversion rate adjustment |  |  |  | 191 |  |
Ending Balance | $ (52) |  | $ (34) | (52) | (34) |
Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Beginning Balance |  |  |  | 5,717 | 0 |
Recovery through conversion rate adjustment |  |  |  | (191) |  |
Ending Balance | 5,526 |  | 5,717 | 5,526 | 5,717 |
Preferred Stock | Series B Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Beginning Balance |  |  |  | 2,516 |  |
Recovery through conversion rate adjustment |  |  |  | (190) |  |
Ending Balance | 2,326 |  | 2,516 | 2,326 | 2,516 |
Preferred Stock | Series C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Beginning Balance |  |  |  | 3,201 |  |
Recovery through conversion rate adjustment |  |  |  | (1) |  |
Ending Balance | $ 3,200 |  | $ 3,201 | $ 3,200 | $ 3,201 |
[1] | The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.

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