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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, 2020 | Dec. 31, 2019
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 3,645 | $ 4,022
Less Than 12 Months, Gross Unrealized Losses | (40) | (22)
Greater Than 12 Months, Fair Value | 455 | 1,073
Greater Than 12 Months, Gross Unrealized Losses | (8) | (7)
Total, Fair Value | 4,100 | 5,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (48) | (29)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value |  | 616
Less Than 12 Months, Gross Unrealized Losses |  | (4)
Greater Than 12 Months, Fair Value |  | 0
Greater Than 12 Months, Gross Unrealized Losses |  | 0
Total, Fair Value |  | 616
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (4)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 366 | 440
Less Than 12 Months, Gross Unrealized Losses | (4) | (5)
Greater Than 12 Months, Fair Value | 0 | 0
Greater Than 12 Months, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 366 | 440
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (4) | (5)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,314 | 1,903
Less Than 12 Months, Gross Unrealized Losses | (30) | (7)
Greater Than 12 Months, Fair Value | 400 | 740
Greater Than 12 Months, Gross Unrealized Losses | (5) | (4)
Total, Fair Value | 2,714 | 2,643
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (35) | (11)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 687 | 657
Less Than 12 Months, Gross Unrealized Losses | (3) | (3)
Greater Than 12 Months, Fair Value | 0 | 333
Greater Than 12 Months, Gross Unrealized Losses | 0 | (3)
Total, Fair Value | 687 | 990
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3) | (6)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 278 | 406
Less Than 12 Months, Gross Unrealized Losses | (3) | (3)
Greater Than 12 Months, Fair Value | 55 | 0
Greater Than 12 Months, Gross Unrealized Losses | (3) | 0
Total, Fair Value | 333 | 406
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (6) | $ (3)

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- Definition 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 No definition available. + Details
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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=121645371&loc=d3e27337-111563 + Details
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