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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	Mar. 31, 2022	Dec. 31, 2021
Debt Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	$ 26,579	$ 17,118
Less Than 12 Months, Gross Unrealized Losses	(1,182)	(237)
Greater Than 12 Months, Fair Value	4,291	886
Greater Than 12 Months, Gross Unrealized Losses	(421)	(37)
Total, Fair Value	30,870	18,004
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,603)	(274)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,485	1,976
Less Than 12 Months, Gross Unrealized Losses	(96)	(18)
Greater Than 12 Months, Fair Value	451	249
Greater Than 12 Months, Gross Unrealized Losses	(44)	(13)
Total, Fair Value	2,936	2,225
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(140)	(31)
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	3,568	1,386
Less Than 12 Months, Gross Unrealized Losses	(204)	(19)
Greater Than 12 Months, Fair Value	218	31
Greater Than 12 Months, Gross Unrealized Losses	(20)	(1)
Total, Fair Value	3,786	1,417
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(224)	(20)
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	14,237	9,357
Less Than 12 Months, Gross Unrealized Losses	(603)	(130)
Greater Than 12 Months, Fair Value	2,049	376
Greater Than 12 Months, Gross Unrealized Losses	(208)	(15)
Total, Fair Value	16,286	9,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(811)	(145)
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	4,192	3,078
Less Than 12 Months, Gross Unrealized Losses	(201)	(52)
Greater Than 12 Months, Fair Value	1,225	116
Greater Than 12 Months, Gross Unrealized Losses	(115)	(3)
Total, Fair Value	5,417	3,194
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(316)	(55)
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,097	1,321
Less Than 12 Months, Gross Unrealized Losses	(78)	(18)
Greater Than 12 Months, Fair Value	348	114
Greater Than 12 Months, Gross Unrealized Losses	(34)	(5)
Total, Fair Value	2,445	1,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (112)	$ (23)

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