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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
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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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- 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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