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Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:        
Net cash used in operating activities $ 480 $ 210 $ 300  
Cash flows from investing activities:        
Net cash provided by (used in) investing activities (275) (26) (259)  
Cash flows from financing activities:        
Repurchase of restricted stock shares for payroll tax withholding requirements (1) (4) (8)  
Net cash used in financing activities (206) (264) (430)  
Net change in cash and cash equivalents (1) (80) (389)  
Cash and cash equivalents at beginning of period 37 38 118 $ 507
Parent Company        
Cash flows from operating activities:        
Net cash used in operating activities (167) (85) (13)  
Cash flows from financing activities:        
Repurchase of restricted stock shares for payroll tax withholding requirements (2) (4) (8)  
Changes in intercompany balances with affiliates, net 169 89 21  
Net cash used in financing activities $ 167 $ 85 $ 13