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Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Millions |  | 3 Months Ended | 9 Months Ended | 29 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2024 USD ($) $ / shares | Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) $ / shares | Mar. 31, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 15, 2029 USD ($) | May 15, 2029 USD ($) | Jun. 15, 2026 USD ($) | Sep. 15, 2025 USD ($) | Apr. 20, 2022 USD ($)
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  | $ 29 | $ 24 | $ 25 | $ 25 | $ 25 | $ 24 |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 31,000 |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  |  |  |  |  |  |  | $ 557 |  |  |  |  |
Cash dividend declared (in dollars per share) | $ / shares |  | $ 0.25 | $ 0.24 | $ 0.24 |  |  |  | $ 0.73 | $ 0.64 |  |  |  |  |  |
Series B(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares |  | $ 1,000 |  |  |  |  |  | 1,000 |  | $ 1,000 |  |  |  |  |
Stock Redeemed or Called During Period, Shares | shares |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B(2) | Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares |  | $ 25 |  |  |  |  |  | 25 |  | 25 |  |  |  |  |
Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares |  | 1,000 |  |  |  |  |  | 1,000 |  | 1,000 |  |  |  |  |
Series C | Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares |  | 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) | $ / shares |  | 100,000 |  |  |  |  |  | 100,000 |  | 100,000 |  |  |  |  |
Series D | Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares |  | 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) | $ / shares |  | 1,000 |  |  |  |  |  | 1,000 |  | 1,000 |  |  |  |  |
Series E | Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares |  | $ 25 |  |  |  |  |  | 25 |  | 25 |  |  |  |  |
Series E | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares | $ 1,000 | $ 1,000 |  |  |  |  |  | 1,000 |  | 1,000 |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |
Series F Preferred Stock | Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in usd per share) | $ / shares | $ 25.00 | $ 25 |  |  |  |  |  | $ 25 |  | $ 25 |  |  |  |  |
Series F Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  |  |  | $ 11 |  |  |  |
us-gaap_SeriesBandCandDand EPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  | $ 74 |  |  |  |  |  |
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Preferred stock dividends |  |  |  |  |  |  |  | $ 78 |  |  |  |  |  |  |

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