Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 58	$ 79
Other comprehensive income before reclassifications	296	13
Amounts reclassified from accumulated other comprehensive income	(15)	(9)
Income Tax Expense (Benefit)	(2)	(18)	$ 3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(310)	(21)
Ending Balance	(253)	58	79
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	154	166
Other comprehensive income before reclassifications	211	5
Amounts reclassified from accumulated other comprehensive income	(14)	(7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(225)	(12)
Ending Balance	(71)	154	166
Accumulated Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(100)	(92)
Other comprehensive income before reclassifications	85	8
Amounts reclassified from accumulated other comprehensive income	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(85)	(8)
Ending Balance	(184)	(100)	(92)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(1)	0
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	(1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	(1)
Ending Balance	(1)	(1)	0
Other Postretirement Benefits Plan [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	4	5
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	$ 3	$ 4	$ 5