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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
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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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