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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, 2021	Dec. 31, 2020
Debt Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	$ 12,563	$ 2,415
Less Than 12 Months, Gross Unrealized Losses	(149)	(16)
Greater Than 12 Months, Fair Value	535	549
Greater Than 12 Months, Gross Unrealized Losses	(20)	(6)
Total, Fair Value	13,098	2,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(169)	(22)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	1,499	346
Less Than 12 Months, Gross Unrealized Losses	(16)	(3)
Greater Than 12 Months, Fair Value	117	0
Greater Than 12 Months, Gross Unrealized Losses	(7)	0
Total, Fair Value	1,616	346
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(23)	(3)
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	1,226
Less Than 12 Months, Gross Unrealized Losses	(15)
Greater Than 12 Months, Fair Value	0
Greater Than 12 Months, Gross Unrealized Losses	0
Total, Fair Value	1,226
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(15)
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	6,471	1,273
Less Than 12 Months, Gross Unrealized Losses	(75)	(9)
Greater Than 12 Months, Fair Value	326	456
Greater Than 12 Months, Gross Unrealized Losses	(9)	(3)
Total, Fair Value	6,797	1,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(84)	(12)
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,537	601
Less Than 12 Months, Gross Unrealized Losses	(34)	(3)
Greater Than 12 Months, Fair Value	0	0
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	2,537	601
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(34)	(3)
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	830	195
Less Than 12 Months, Gross Unrealized Losses	(9)	(1)
Greater Than 12 Months, Fair Value	92	93
Greater Than 12 Months, Gross Unrealized Losses	(4)	(3)
Total, Fair Value	922	288
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (13)	$ (4)

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