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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance $ 79 $ 42  
Other comprehensive income before reclassifications 13 (58)  
Amounts reclassified from accumulated other comprehensive income (9) (21)  
Income Tax Expense (Benefit) (18) 3 $ (32)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (21) 37  
Ending Balance 58 79 42
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance 166 151  
Other comprehensive income before reclassifications 5 (36)  
Amounts reclassified from accumulated other comprehensive income (7) (21)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (12) 15  
Ending Balance 154 166 151
Accumulated Translation Adjustment [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance (92) (116)  
Other comprehensive income before reclassifications 8 (23)  
Amounts reclassified from accumulated other comprehensive income 0 0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (8) 23  
Ending Balance (100) (92) (116)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance 0 (2)  
Other comprehensive income before reclassifications 0 0  
Amounts reclassified from accumulated other comprehensive income (1) 1  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1) 1  
Ending Balance (1) 0 (2)
Other Postretirement Benefits Plan [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance 5 8  
Other comprehensive income before reclassifications 0 2  
Amounts reclassified from accumulated other comprehensive income (1) (1)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1) (3)  
Ending Balance $ 4 $ 5 $ 8