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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, 2021 | Dec. 31, 2020
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 12,563 | $ 2,415
Less Than 12 Months, Gross Unrealized Losses | (149) | (16)
Greater Than 12 Months, Fair Value | 535 | 549
Greater Than 12 Months, Gross Unrealized Losses | (20) | (6)
Total, Fair Value | 13,098 | 2,964
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (169) | (22)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,499 | 346
Less Than 12 Months, Gross Unrealized Losses | (16) | (3)
Greater Than 12 Months, Fair Value | 117 | 0
Greater Than 12 Months, Gross Unrealized Losses | (7) | 0
Total, Fair Value | 1,616 | 346
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (23) | (3)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,226 |
Less Than 12 Months, Gross Unrealized Losses | (15) |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months, Gross Unrealized Losses | 0 |
Total, Fair Value | 1,226 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (15) |
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 6,471 | 1,273
Less Than 12 Months, Gross Unrealized Losses | (75) | (9)
Greater Than 12 Months, Fair Value | 326 | 456
Greater Than 12 Months, Gross Unrealized Losses | (9) | (3)
Total, Fair Value | 6,797 | 1,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (84) | (12)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,537 | 601
Less Than 12 Months, Gross Unrealized Losses | (34) | (3)
Greater Than 12 Months, Fair Value | 0 | 0
Greater Than 12 Months, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 2,537 | 601
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (34) | (3)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 830 | 195
Less Than 12 Months, Gross Unrealized Losses | (9) | (1)
Greater Than 12 Months, Fair Value | 92 | 93
Greater Than 12 Months, Gross Unrealized Losses | (4) | (3)
Total, Fair Value | 922 | 288
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (13) | $ (4)

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