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Basis of Presentation and Significant Accounting Policies Noncontrolling Interest (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
shares
Jun. 30, 2023
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest $ 53   $ 53 $ 53  
Preferred Stock, Shares Outstanding | shares 0   0 0  
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 17   $ 17 $ 20 $ 18
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value 2   2 5  
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest     1 1  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     (2) (1)  
Temporary Equity, Accretion to Redemption Value, Adjustment     (5) $ (3)  
AMPS Shares Purchased       (905)  
AMPS Gain Based on Carry Value       $ 1  
AMPS Purchase Cash Paid       $ 8  
Ambac Assurance Corporation [Member]          
Stockholders' Equity Attributable to Noncontrolling Interest $ 51   $ 51    
Preferred Stock, Shares Outstanding | shares 4,596   4,596 4,596  
Preferred Stock, Liquidation Preference, Value $ 115   $ 115 $ 115  
London Interbank Offered Rate (LIBOR) [Member]          
Dividend Rate on Auction Rate Preferred Shares   20000.00%      
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Dividend Rate on Auction Rate Preferred Shares 11.448%