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Regulation and Equity - Statutory Income and Net Capital (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statutory Accounting Practices [Line Items]      
Statutory net income (loss) $ 778 $ 936 $ 629
Statutory capital and surplus 1,350 1,903  
IOWA      
Statutory Accounting Practices [Line Items]      
Statutory net income (loss) (243) 351  
Statutory capital and surplus 1,877 1,473  
New York      
Statutory Accounting Practices [Line Items]      
Statutory net income (loss) (15) 4  
Statutory capital and surplus 82 99  
VERMONT      
Statutory Accounting Practices [Line Items]      
Statutory net income (loss) (111) 3  
Statutory capital and surplus $ 121 $ 115