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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, 2021	Dec. 31, 2020
Debt Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	$ 10,038	$ 2,415
Less Than 12 Months, Gross Unrealized Losses	(118)	(16)
Greater Than 12 Months, Fair Value	271	549
Greater Than 12 Months, Gross Unrealized Losses	(3)	(6)
Total, Fair Value	10,309	2,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(121)	(22)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	1,201	346
Less Than 12 Months, Gross Unrealized Losses	(17)	(3)
Greater Than 12 Months, Fair Value	0	0
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	1,201	346
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(17)	(3)
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	777
Less Than 12 Months, Gross Unrealized Losses	(7)
Greater Than 12 Months, Fair Value	0
Greater Than 12 Months, Gross Unrealized Losses	0
Total, Fair Value	777
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(7)
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	4,679	1,273
Less Than 12 Months, Gross Unrealized Losses	(56)	(9)
Greater Than 12 Months, Fair Value	229	456
Greater Than 12 Months, Gross Unrealized Losses	(1)	(3)
Total, Fair Value	4,908	1,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(57)	(12)
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	2,668	601
Less Than 12 Months, Gross Unrealized Losses	(30)	(3)
Greater Than 12 Months, Fair Value	0	0
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	2,668	601
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(30)	(3)
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less Than 12 Months, Fair Value	713	195
Less Than 12 Months, Gross Unrealized Losses	(8)	(1)
Greater Than 12 Months, Fair Value	42	93
Greater Than 12 Months, Gross Unrealized Losses	(2)	(3)
Total, Fair Value	755	288
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (10)	$ (4)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563

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