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Accumulated Other Comprehensive Income (Loss) (AOCI) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss), net of tax, Beginning Balance $ 40    
Tax effect 42 $ (21) $ (33)
Accumulated other comprehensive income (loss), net of tax, Ending Balance (92) 40  
Unrealized Gains (Losses) on Debt Securities Attributable to First American Financial Corporation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Beginning Balance 172 84 (41)
Change in unrealized gains (losses) on debt securities (189) 116 164
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings   1  
Tax effect 46 (29) (39)
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Ending Balance 29 172 84
Foreign Currency Translation Adjustment Attributable to First American Financial Corporation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Beginning Balance (38) (52) (66)
Change in foreign currency translation adjustment (2) 14 15
Tax effect 1   (1)
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Ending Balance (39) (38) (52)
Pension Benefit Adjustment Attributable to First American Financial Corporation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Beginning Balance (94) (73) (53)
Net actuarial (loss) gain 11 (31) (27)
Amortization of net actuarial loss 7 5 4
Amortization of prior service credit (1) (3) (4)
Tax effect (5) 8 7
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Ending Balance (82) (94) (73)
Accumulated Other Comprehensive Income/(loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss), net of tax, Beginning Balance 40 (41) (160)
Change in unrealized gains (losses) on debt securities (189) 116 164
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings   1  
Change in foreign currency translation adjustment (2) 14 15
Net actuarial (loss) gain 11 (31) (27)
Amortization of net actuarial loss 7 5 4
Amortization of prior service credit (1) (3) (4)
Tax effect 42 (21) (33)
Accumulated other comprehensive income (loss), net of tax, Ending Balance $ (92) $ 40 $ (41)