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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	Jun. 30, 2022	Dec. 31, 2021
Debt Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	$ 31,299	$ 17,118
Less Than 12 Months, Gross Unrealized Losses	(2,214)	(237)
Greater Than 12 Months, Fair Value	4,499	886
Greater Than 12 Months, Gross Unrealized Losses	(629)	(37)
Total, Fair Value	35,798	18,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,843)	(274)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,921	1,976
Less Than 12 Months, Gross Unrealized Losses	(152)	(18)
Greater Than 12 Months, Fair Value	474	249
Greater Than 12 Months, Gross Unrealized Losses	(57)	(13)
Total, Fair Value	3,395	2,225
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(209)	(31)
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	4,807	1,386
Less Than 12 Months, Gross Unrealized Losses	(355)	(19)
Greater Than 12 Months, Fair Value	209	31
Greater Than 12 Months, Gross Unrealized Losses	(26)	(1)
Total, Fair Value	5,016	1,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(381)	(20)
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	16,894	9,357
Less Than 12 Months, Gross Unrealized Losses	(1,200)	(130)
Greater Than 12 Months, Fair Value	2,261	376
Greater Than 12 Months, Gross Unrealized Losses	(315)	(15)
Total, Fair Value	19,155	9,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,515)	(145)
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	4,323	3,078
Less Than 12 Months, Gross Unrealized Losses	(356)	(52)
Greater Than 12 Months, Fair Value	1,201	116
Greater Than 12 Months, Gross Unrealized Losses	(181)	(3)
Total, Fair Value	5,524	3,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(537)	(55)
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,354	1,321
Less Than 12 Months, Gross Unrealized Losses	(151)	(18)
Greater Than 12 Months, Fair Value	354	114
Greater Than 12 Months, Gross Unrealized Losses	(50)	(5)
Total, Fair Value	2,708	1,435
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (201)	$ (23)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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