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Stockholders' Equity (Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 16, 2024 | Sep. 12, 2019 | Mar. 29, 2019 | Dec. 31, 2019 | Jun. 15, 2024 | Sep. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Net proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 989 | $ 973 | $ 1,962 |  |  |
Current maturities of long-term debt |  |  |  | $ 3,141 |  |  | $ 3,406
Series A Cumulative Redeemable Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) |  |  | 40,000,000 |  |  |  |
Preferred stock, issue price (in usd per share) |  |  | $ 25 |  |  |  |
Liquidation preference per share (in usd per share) |  |  | $ 25 |  |  |  |
Cumulative annual dividend rate |  |  | 5.75% |  |  |  |
Redemption price (in usd per share) |  |  |  | $ 25.50 |  |  |
Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) |  | 1,000,000 |  |  |  |  |
Preferred stock, issue price (in usd per share) |  | $ 1,000 |  |  |  |  |
Liquidation preference per share (in usd per share) |  | $ 1,000 |  |  |  |  |
Cumulative annual dividend rate |  | 4.875% |  |  |  |  |
Redemption price (in usd per share) |  | $ 1,020 |  |  |  |  |
Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redemption price (in usd per share) |  |  |  |  | $ 25 |  |
Forecast | Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cumulative annual dividend rate | 3.388% |  |  |  |  |  |
Unsecured Debt | Senior notes due September 2019 | Parent Company |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Current maturities of long-term debt |  |  |  |  |  | $ 500 |

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