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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, 2022 | Dec. 31, 2021
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 26,579 | $ 17,118
Less Than 12 Months, Gross Unrealized Losses | (1,182) | (237)
Greater Than 12 Months, Fair Value | 4,291 | 886
Greater Than 12 Months, Gross Unrealized Losses | (421) | (37)
Total, Fair Value | 30,870 | 18,004
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,603) | (274)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,485 | 1,976
Less Than 12 Months, Gross Unrealized Losses | (96) | (18)
Greater Than 12 Months, Fair Value | 451 | 249
Greater Than 12 Months, Gross Unrealized Losses | (44) | (13)
Total, Fair Value | 2,936 | 2,225
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (140) | (31)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 3,568 | 1,386
Less Than 12 Months, Gross Unrealized Losses | (204) | (19)
Greater Than 12 Months, Fair Value | 218 | 31
Greater Than 12 Months, Gross Unrealized Losses | (20) | (1)
Total, Fair Value | 3,786 | 1,417
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (224) | (20)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 14,237 | 9,357
Less Than 12 Months, Gross Unrealized Losses | (603) | (130)
Greater Than 12 Months, Fair Value | 2,049 | 376
Greater Than 12 Months, Gross Unrealized Losses | (208) | (15)
Total, Fair Value | 16,286 | 9,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (811) | (145)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,192 | 3,078
Less Than 12 Months, Gross Unrealized Losses | (201) | (52)
Greater Than 12 Months, Fair Value | 1,225 | 116
Greater Than 12 Months, Gross Unrealized Losses | (115) | (3)
Total, Fair Value | 5,417 | 3,194
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (316) | (55)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,097 | 1,321
Less Than 12 Months, Gross Unrealized Losses | (78) | (18)
Greater Than 12 Months, Fair Value | 348 | 114
Greater Than 12 Months, Gross Unrealized Losses | (34) | (5)
Total, Fair Value | 2,445 | 1,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (112) | $ (23)

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