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Debt Securities (Investments in Debt Securities, Classified as Available-For-Sale) (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	$ 9,257	$ 9,317
Debt Securities, Gross unrealized gains	5	127
Debt Securities, Gross unrealized losses	(812)	(82)
Debt securities, Estimated fair value	8,450	9,362
U.S. Treasury bonds
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	155	123
Debt Securities, Gross unrealized gains	0	1
Debt Securities, Gross unrealized losses	(8)	(1)
Debt securities, Estimated fair value	147	123
Municipal bonds
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	1,609	1,607
Debt Securities, Gross unrealized gains	2	59
Debt Securities, Gross unrealized losses	(149)	(17)
Debt securities, Estimated fair value	1,462	1,649
Foreign government bonds
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	217	228
Debt Securities, Gross unrealized gains	0	2
Debt Securities, Gross unrealized losses	(17)	(3)
Debt securities, Estimated fair value	200	227
Governmental agency bonds
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	141	175
Debt Securities, Gross unrealized gains	0	3
Debt Securities, Gross unrealized losses	(12)	(1)
Debt securities, Estimated fair value	129	177
Governmental agency mortgage-backed securities
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	5,539	5,620
Debt Securities, Gross unrealized gains	3	34
Debt Securities, Gross unrealized losses	(492)	(47)
Debt securities, Estimated fair value	5,050	5,607
U.S. corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	1,096	1,071
Debt Securities, Gross unrealized gains	0	19
Debt Securities, Gross unrealized losses	(93)	(9)
Debt securities, Estimated fair value	1,003	1,081
Foreign corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Debt Securities, Amortized cost	500	493
Debt Securities, Gross unrealized gains	0	9
Debt Securities, Gross unrealized losses	(41)	(4)
Debt securities, Estimated fair value	$ 459	$ 498

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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