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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, 2021 | Sep. 15, 2024 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 1,750 |  |
Preferred stock |  |  |  | $ 1,659 |  | $ 1,656
Series A Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | [1],[2] |  |  | 6.375% |  |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 0 |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 1,000 |  |
Preferred stock |  |  |  | $ 0 |  | 387
Series B Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | [1],[3] |  |  | 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 | [1],[4] |  |  | 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 | [1],[5] |  |  | 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 | [1] |  |  | 4.45% |  |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 400 |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 1,000 |  |
Preferred stock |  |  |  | $ 390 |  | $ 0
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 A Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 25 |  |
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 |  |
[1] | Dividends on all series of preferred stock, if declared, accrue and are payable quarterly in arrears.
[2] | The shares were fully redeemed on June 15, 2021.
[3] | Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2024, 6.375%, and (ii) for each period beginning on or after September 15, 2024, three-month LIBOR plus 3.536%.
[4] | Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to August 15, 2029, 5.700%, and (ii) for each period beginning on or after August 15, 2029, three-month LIBOR plus 3.148%.
[5] | Dividends, if declared, will be paid quarterly at an annual rate equal to (i) for each period beginning prior to September 15, 2025, 5.750%, and (ii) for each period beginning on or after September 15, 2025, the five-year treasury rate as of the most recent reset dividend determination date plus 5.426%.

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- Definition 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 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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