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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
Dec. 31, 2021
Dec. 31, 2020
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           $ 3,387 $ 4,238
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