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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, 2021 | Dec. 31, 2020
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 10,533 | $ 2,415
Less Than 12 Months, Gross Unrealized Losses | (233) | (16)
Greater Than 12 Months, Fair Value | 448 | 549
Greater Than 12 Months, Gross Unrealized Losses | (4) | (6)
Total, Fair Value | 10,981 | 2,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (237) | (22)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 924 | 346
Less Than 12 Months, Gross Unrealized Losses | (26) | (3)
Greater Than 12 Months, Fair Value | 0 | 0
Greater Than 12 Months, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 924 | 346
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (26) | (3)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,141 |
Less Than 12 Months, Gross Unrealized Losses | (22) |
Greater Than 12 Months, Fair Value | 3 |
Greater Than 12 Months, Gross Unrealized Losses | 0 |
Total, Fair Value | 1,144 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (22) |
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 5,266 | 1,273
Less Than 12 Months, Gross Unrealized Losses | (120) | (9)
Greater Than 12 Months, Fair Value | 367 | 456
Greater Than 12 Months, Gross Unrealized Losses | (2) | (3)
Total, Fair Value | 5,633 | 1,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (122) | (12)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,552 | 601
Less Than 12 Months, Gross Unrealized Losses | (48) | (3)
Greater Than 12 Months, Fair Value | 1 | 0
Greater Than 12 Months, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 2,553 | 601
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (48) | (3)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 650 | 195
Less Than 12 Months, Gross Unrealized Losses | (17) | (1)
Greater Than 12 Months, Fair Value | 77 | 93
Greater Than 12 Months, Gross Unrealized Losses | (2) | (3)
Total, Fair Value | 727 | 288
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (19) | $ (4)

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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=123581744&loc=d3e27337-111563 + Details
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