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U.S. and Europe Retrospective Responsibility Plans - Schedule of Preferred Stock As-Converted Value and Book Value (Details) $ / shares in Units, shares in Millions, $ in Millions | Mar. 31, 2026 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) $ / shares shares
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Restricted Cash and Cash Equivalent Item [Line Items] |  |
As-converted Value of Preferred Stock | $ 1,131 | $ 1,389
Book value of preferred stock | 528 | 745
Book Value of Preferred Stock, Total | 123 | 232
Less: right to recover for covered losses | (44) | (124)
As-converted Value of Preferred Stock, Total recovery for covered losses available | 1,087 | 1,265
Book Value of Preferred of Stock, Total recovery for covered losses available | $ 79 | $ 108
Preferred stock, shares outstanding (in shares) | shares | 5 | 5
Share price (in dollars per share) | $ / shares | $ 302.24 | $ 341.38
Series B preferred stock |  |
Restricted Cash and Cash Equivalent Item [Line Items] |  |
As-converted Value of Preferred Stock | $ 447 | $ 566
Book value of preferred stock | $ 7 | $ 67
Preferred stock, shares outstanding (in shares) | shares | 2 | 2
Preferred stock, conversion rate (in percent) | 0.5960 | 0.6690
Series C preferred stock |  |
Restricted Cash and Cash Equivalent Item [Line Items] |  |
As-converted Value of Preferred Stock | $ 684 | $ 823
Book value of preferred stock | $ 116 | $ 165
Preferred stock, shares outstanding (in shares) | shares | 3 | 3
Preferred stock, conversion rate (in percent) | 0.7170 | 0.7640

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-3 + Details
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- Definition Value of nonredeemable preferred shares and preferred shares redeemable solely at option of issuer, held by shareholders. Excludes preferred shares repurchased and held as treasury shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 + Details
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- Definition Preferred Stock Available to Recover Covered Losses, Value, As-converted, Gross + References No definition available. + Details
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- Definition VE Covered Loss, Protection from the Plan Relating to Liabilities where the Claim Relates to Inter-regional Multilateral Interchange Fee Rates + References No definition available. + Details
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