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Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss), net of tax, Beginning Balance     $ (92)  
Change in unrealized gains (losses) on debt securities     (852)  
Change in foreign currency translation adjustment     (23)  
Amortization of net actuarial loss     3  
Tax effect $ 90 $ (11) 214 $ 19
Accumulated other comprehensive income (loss), net of tax, Ending Balance (750)   (750)  
Unrealized Gains (Losses) on Debt Securities        
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     29  
Change in unrealized gains (losses) on debt securities     (852)  
Tax effect 89 (13) 214 19
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Ending Balance (609)   (609)  
Foreign Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Beginning Balance     (39)  
Change in foreign currency translation adjustment     (23)  
Tax effect 1 $ 2 1 $ 0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Ending Balance (61)   (61)  
Pension Benefit Adjustment        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Beginning Balance     (82)  
Amortization of net actuarial loss     3  
Tax effect     (1)  
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Ending Balance $ (80)   $ (80)