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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, 2022 | Dec. 31, 2021
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 30,052 | $ 17,118
Less Than 12 Months, Gross Unrealized Losses | (2,621) | (237)
Greater Than 12 Months, Fair Value | 8,342 | 886
Greater Than 12 Months, Gross Unrealized Losses | (1,526) | (37)
Total, Fair Value | 38,394 | 18,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (4,147) | (274)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,484 | 1,976
Less Than 12 Months, Gross Unrealized Losses | (170) | (18)
Greater Than 12 Months, Fair Value | 866 | 249
Greater Than 12 Months, Gross Unrealized Losses | (129) | (13)
Total, Fair Value | 3,350 | 2,225
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (299) | (31)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 5,811 | 1,386
Less Than 12 Months, Gross Unrealized Losses | (470) | (19)
Greater Than 12 Months, Fair Value | 833 | 31
Greater Than 12 Months, Gross Unrealized Losses | (151) | (1)
Total, Fair Value | 6,644 | 1,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (621) | (20)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 15,374 | 9,357
Less Than 12 Months, Gross Unrealized Losses | (1,292) | (130)
Greater Than 12 Months, Fair Value | 4,364 | 376
Greater Than 12 Months, Gross Unrealized Losses | (765) | (15)
Total, Fair Value | 19,738 | 9,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,057) | (145)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,201 | 3,078
Less Than 12 Months, Gross Unrealized Losses | (517) | (52)
Greater Than 12 Months, Fair Value | 1,609 | 116
Greater Than 12 Months, Gross Unrealized Losses | (358) | (3)
Total, Fair Value | 5,810 | 3,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (875) | (55)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,182 | 1,321
Less Than 12 Months, Gross Unrealized Losses | (172) | (18)
Greater Than 12 Months, Fair Value | 670 | 114
Greater Than 12 Months, Gross Unrealized Losses | (123) | (5)
Total, Fair Value | 2,852 | 1,435
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (295) | $ (23)

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