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Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended | 26 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2024 USD ($) $ / shares | Sep. 30, 2024 $ / shares | Jun. 30, 2024 USD ($) $ / shares | Mar. 31, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) $ / shares | Mar. 31, 2023 USD ($) $ / shares | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2024 USD ($) $ / shares shares | Sep. 15, 2025 USD ($) | Sep. 15, 2024 USD ($) | Apr. 20, 2022 USD ($)
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends | $ |  |  | $ 24 | $ 25 | $ 25 | $ 24 |  |  |  |  |  |
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum |  |  | 0.025 |  |  |  | 0.025 |  | 0.025 |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 2,500
Stock Repurchased During Period, Shares | shares |  |  |  |  |  |  |  |  | 27 |  |  |
Stock Repurchased During Period, Value | $ |  |  |  |  |  |  |  |  | $ 456 |  |  |
Cash dividend declared (in dollars per share) |  |  | $ 0.24 | $ 0.24 | $ 0.20 | $ 0.20 | $ 0.48 | $ 0.40 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) |  | $ 0.25 |  |  |  |  |  |  |  |  |  |
Series B |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 1,000 |  |  |  | $ 1,000 |  | $ 1,000 |  |  |
Dividend rate, percentage |  |  |  |  |  |  | 6.375% |  |  |  |  |
Series B | Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 25 |  |  |  | $ 25 |  | 25 |  |  |
Series B | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount | $ |  |  |  |  |  |  |  |  |  |  | $ 67 |
PreferredDividendsReductiontoRetainedEarningsatRedemption | $ |  |  |  |  |  |  |  |  |  |  | 52 |
Series C |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 1,000 |  |  |  | $ 1,000 |  | 1,000 |  |  |
Dividend rate, percentage |  |  |  |  |  |  | 5.70% |  |  |  |  |
Series C | Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 25 |  |  |  | $ 25 |  | 25 |  |  |
Series C | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount | $ |  |  |  |  |  |  |  |  |  |  | $ 10 |
Series D |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 100,000 |  |  |  | $ 100,000 |  | 100,000 |  |  |
Dividend rate, percentage |  |  |  |  |  |  | 5.75% |  |  |  |  |
Series D | Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 1,000 |  |  |  | $ 1,000 |  | 1,000 |  |  |
Series D | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount | $ |  |  |  |  |  |  |  |  |  | $ 4 |  |
Series E |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | 1,000 |  |  |  | $ 1,000 |  | 1,000 |  |  |
Dividend rate, percentage |  |  |  |  |  |  | 4.45% |  |  |  |  |
Series E | Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) |  |  | $ 25 |  |  |  | $ 25 |  | $ 25 |  |  |
Series E | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount | $ |  |  |  |  |  |  |  |  |  | $ 10 |  |
us-gaap_SeriesBandCandDand EPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends | $ |  |  |  |  |  |  | $ 49 | $ 49 |  |  |  |
Series F Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ | $ 500 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ 1,000 |  |  |  |  |  |  |  |  |  |  |
Series F Preferred Stock | Subsequent Event | Depositary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Series F Preferred Stock Dividend Scenario 1 Member | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage | 6.95% |  |  |  |  |  |  |  |  |  |  |

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