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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, 2023 | Dec. 31, 2022
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 15,103 | $ 24,899
Less Than 12 Months, Gross Unrealized Losses | (290) | (1,750)
Greater Than 12 Months, Fair Value | 25,753 | 12,320
Greater Than 12 Months, Gross Unrealized Losses | (3,166) | (1,914)
Total, Fair Value | 40,856 | 37,219
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,456) | (3,664)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,300 | 2,007
Less Than 12 Months, Gross Unrealized Losses | (28) | (96)
Greater Than 12 Months, Fair Value | 1,902 | 1,290
Greater Than 12 Months, Gross Unrealized Losses | (255) | (189)
Total, Fair Value | 4,202 | 3,297
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (283) | (285)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,769 | 4,630
Less Than 12 Months, Gross Unrealized Losses | (46) | (288)
Greater Than 12 Months, Fair Value | 3,324 | 1,178
Greater Than 12 Months, Gross Unrealized Losses | (381) | (191)
Total, Fair Value | 6,093 | 5,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (427) | (479)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 6,346 | 13,003
Less Than 12 Months, Gross Unrealized Losses | (122) | (893)
Greater Than 12 Months, Fair Value | 13,974 | 6,637
Greater Than 12 Months, Gross Unrealized Losses | (1,521) | (905)
Total, Fair Value | 20,320 | 19,640
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,643) | (1,798)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 3,111 | 3,561
Less Than 12 Months, Gross Unrealized Losses | (79) | (345)
Greater Than 12 Months, Fair Value | 4,314 | 2,239
Greater Than 12 Months, Gross Unrealized Losses | (720) | (463)
Total, Fair Value | 7,425 | 5,800
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (799) | (808)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 577 | 1,698
Less Than 12 Months, Gross Unrealized Losses | (15) | (128)
Greater Than 12 Months, Fair Value | 2,239 | 976
Greater Than 12 Months, Gross Unrealized Losses | (289) | (166)
Total, Fair Value | 2,816 | 2,674
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (304) | $ (294)

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