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Summary Quarterly Financial Data (Unaudited) - Statement of Cash Flow (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Net income (loss)   $ (9) $ 75 $ 69 $ 128 $ 41 $ 87 $ 50 $ 144 $ 137 $ 135 $ 178 $ 213 $ 306  
U.S. deferred tax benefit       2       6 8 18 (61) 26 55 (71) $ (395)
Prior To Change                              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Net income (loss) $ 78 $ 59 $ 69 67 $ 125 $ 40 $ 75 44 136 119 195 159   284  
U.S. deferred tax benefit       $ 0       $ 0 $ 0 $ 0 $ (1) $ 7 $ 28 $ (49) $ (313)