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Investments (Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time That Individual Securities Have Been in a Continuous Unrealized Loss Position) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	$ 30,052	$ 17,118
Less Than 12 Months, Gross Unrealized Losses	(2,621)	(237)
Greater Than 12 Months, Fair Value	8,342	886
Greater Than 12 Months, Gross Unrealized Losses	(1,526)	(37)
Total, Fair Value	38,394	18,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(4,147)	(274)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,484	1,976
Less Than 12 Months, Gross Unrealized Losses	(170)	(18)
Greater Than 12 Months, Fair Value	866	249
Greater Than 12 Months, Gross Unrealized Losses	(129)	(13)
Total, Fair Value	3,350	2,225
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(299)	(31)
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	5,811	1,386
Less Than 12 Months, Gross Unrealized Losses	(470)	(19)
Greater Than 12 Months, Fair Value	833	31
Greater Than 12 Months, Gross Unrealized Losses	(151)	(1)
Total, Fair Value	6,644	1,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(621)	(20)
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	15,374	9,357
Less Than 12 Months, Gross Unrealized Losses	(1,292)	(130)
Greater Than 12 Months, Fair Value	4,364	376
Greater Than 12 Months, Gross Unrealized Losses	(765)	(15)
Total, Fair Value	19,738	9,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,057)	(145)
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	4,201	3,078
Less Than 12 Months, Gross Unrealized Losses	(517)	(52)
Greater Than 12 Months, Fair Value	1,609	116
Greater Than 12 Months, Gross Unrealized Losses	(358)	(3)
Total, Fair Value	5,810	3,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(875)	(55)
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,182	1,321
Less Than 12 Months, Gross Unrealized Losses	(172)	(18)
Greater Than 12 Months, Fair Value	670	114
Greater Than 12 Months, Gross Unrealized Losses	(123)	(5)
Total, Fair Value	2,852	1,435
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (295)	$ (23)

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