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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, 2020 | Dec. 31, 2019
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 11,001 | $ 4,022
Less Than 12 Months, Gross Unrealized Losses | (436) | (22)
Greater Than 12 Months, Fair Value | 421 | 1,073
Greater Than 12 Months, Gross Unrealized Losses | (32) | (7)
Total, Fair Value | 11,422 | 5,095
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (468) | (29)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 56 | 616
Less Than 12 Months, Gross Unrealized Losses | (1) | (4)
Greater Than 12 Months, Fair Value | 0 | 0
Greater Than 12 Months, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 56 | 616
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1) | (4)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 810 | 440
Less Than 12 Months, Gross Unrealized Losses | (20) | (5)
Greater Than 12 Months, Fair Value | 0 | 0
Greater Than 12 Months, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 810 | 440
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (20) | (5)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 9,294 | 1,903
Less Than 12 Months, Gross Unrealized Losses | (382) | (7)
Greater Than 12 Months, Fair Value | 391 | 740
Greater Than 12 Months, Gross Unrealized Losses | (29) | (4)
Total, Fair Value | 9,685 | 2,643
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (411) | (11)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value |  | 657
Less Than 12 Months, Gross Unrealized Losses |  | (3)
Greater Than 12 Months, Fair Value |  | 333
Greater Than 12 Months, Gross Unrealized Losses |  | (3)
Total, Fair Value |  | 990
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (6)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 841 | 406
Less Than 12 Months, Gross Unrealized Losses | (33) | (3)
Greater Than 12 Months, Fair Value | 30 | 0
Greater Than 12 Months, Gross Unrealized Losses | (3) | 0
Total, Fair Value | 871 | 406
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (36) | $ (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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