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Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 $ / shares | Jun. 30, 2022 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2021 USD ($) $ / shares | May 15, 2029 USD ($) | Sep. 15, 2025 USD ($) | Sep. 15, 2024 USD ($) | Apr. 20, 2022 USD ($) | Apr. 21, 2021 USD ($)
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  | $ (25,000,000) | $ (24,000,000) | $ (29,000,000) | $ (28,000,000) | $ (49,000,000) | $ (57,000,000) |  |  |  |  |
Stock repurchase plan, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 | $ 2,500,000,000
Stock Repurchased During Period, Value |  | $ 15,000,000 | $ 215,000,000 |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ / shares |  | $ 0.17 | $ 0.17 | $ 0.155 | $ 0.155 | $ 0.34 | $ 0.31 |  |  |  |  |
Stock repurchased (in shares) | shares |  | 725 | 9,100 |  |  |  |  |  |  |  |  |
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum |  | 0.025 |  |  |  | 0.025 |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  |  | $ (16,000,000) |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  | $ (8,000,000) |  |  |  |  |  |
Series B, C and D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  | $ (41,000,000) | $ (41,000,000) |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ / shares | $ 0.2 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  |  | $ 67,000,000 |  |
PreferredDividendsReductiontoRetainedEarningsatRedemption |  |  |  |  |  |  |  |  |  | $ 52,000,000 |  |
Subsequent Event [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Subsequent Event [Member] | Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |
Subsequent Event [Member] | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |

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