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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, 2022 | Dec. 31, 2021
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 31,299 | $ 17,118
Less Than 12 Months, Gross Unrealized Losses | (2,214) | (237)
Greater Than 12 Months, Fair Value | 4,499 | 886
Greater Than 12 Months, Gross Unrealized Losses | (629) | (37)
Total, Fair Value | 35,798 | 18,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,843) | (274)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,921 | 1,976
Less Than 12 Months, Gross Unrealized Losses | (152) | (18)
Greater Than 12 Months, Fair Value | 474 | 249
Greater Than 12 Months, Gross Unrealized Losses | (57) | (13)
Total, Fair Value | 3,395 | 2,225
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (209) | (31)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,807 | 1,386
Less Than 12 Months, Gross Unrealized Losses | (355) | (19)
Greater Than 12 Months, Fair Value | 209 | 31
Greater Than 12 Months, Gross Unrealized Losses | (26) | (1)
Total, Fair Value | 5,016 | 1,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (381) | (20)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 16,894 | 9,357
Less Than 12 Months, Gross Unrealized Losses | (1,200) | (130)
Greater Than 12 Months, Fair Value | 2,261 | 376
Greater Than 12 Months, Gross Unrealized Losses | (315) | (15)
Total, Fair Value | 19,155 | 9,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,515) | (145)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,323 | 3,078
Less Than 12 Months, Gross Unrealized Losses | (356) | (52)
Greater Than 12 Months, Fair Value | 1,201 | 116
Greater Than 12 Months, Gross Unrealized Losses | (181) | (3)
Total, Fair Value | 5,524 | 3,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (537) | (55)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,354 | 1,321
Less Than 12 Months, Gross Unrealized Losses | (151) | (18)
Greater Than 12 Months, Fair Value | 354 | 114
Greater Than 12 Months, Gross Unrealized Losses | (50) | (5)
Total, Fair Value | 2,708 | 1,435
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (201) | $ (23)

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