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Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Taxes        
Effective tax rate of income (loss) before income taxes 23.60% 24.10% 22.20% 24.00%
Tax credits and adjustments $ 37 $ 2 $ 111 $ 6
Investment proportional amortization 19   56  
Income tax benefit from low-income housing investments 26 28 76 76
Variable interest entities interest expense 5 3 16 10
Equity in net losses of unconsolidated entities $ (1) 18 $ (4) 41
Low income housing investments [Member]        
Income Taxes        
Equity in net losses of unconsolidated entities   $ 18   $ 43