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Preferred Stock Issuances (Details) - USD ($) $ / shares in Units, $ in Millions			6 Months Ended	120 Months Ended
	Aug. 15, 2029	Sep. 15, 2025	Jun. 30, 2022	Sep. 15, 2024	Dec. 31, 2021
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value			$ 1,750
Preferred stock			$ 1,659		$ 1,659
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.375%
Preferred Stock, Liquidation Preference, Value			$ 500
Preferred Stock, Liquidation Preference Per Share			$ 1,000
Preferred stock			$ 433		433
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			5.70%
Preferred Stock, Liquidation Preference, Value			$ 500
Preferred Stock, Liquidation Preference Per Share			$ 1,000
Preferred stock			$ 490		490
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			5.75%
Preferred Stock, Liquidation Preference, Value			$ 350
Preferred Stock, Liquidation Preference Per Share			$ 100,000
Preferred stock			$ 346		346
Series E Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			4.45%
Preferred Stock, Liquidation Preference, Value			$ 400
Preferred Stock, Liquidation Preference Per Share			$ 1,000
Preferred stock			$ 390		$ 390
Forecast [Member] | Series B Preferred Stock Dividend Scenario 1 [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage				6.375%
Forecast [Member] | Series C Preferred Stock Dividend Scenario 1 [Member] [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.70%
Plus 3-Month LIBOR [Member] | Forecast [Member] | Series B Preferred Stock Dividend Scenario 2 [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage				3.536%
Plus 3-Month LIBOR [Member] | Forecast [Member] | Series C Preferred Stock Dividend Scenario 2 [Member] [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage	3.148%
Plus 5-year Treasury rate [Member] | Forecast [Member] | Series D Preferred Stock Dividend Scenario 1 [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage		5.75%
Plus 5-year Treasury rate [Member] | Forecast [Member] | Series D Preferred Stock Dividend Scenario 2 [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage		5.426%
Depositary Shares [Member] | Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share			$ 25
Depositary Shares [Member] | Series C Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share			25
Depositary Shares [Member] | Series D Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share			1,000
Depositary Shares [Member] | Series E Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference Per Share			$ 25

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Preferred Stock, Dividend Rate, Basis Spread on Variable Rate, Percentage

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The percentage rate used to calculate dividend payments on preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)
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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders.

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