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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 | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities - held-to-maturity |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 17,118 | $ 2,415
Less Than 12 Months, Gross Unrealized Losses | (237) | (16)
Greater Than 12 Months, Fair Value | 886 | 549
Greater Than 12 Months, Gross Unrealized Losses | (37) | (6)
Total, Fair Value | 18,004 | 2,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (274) | (22)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,976 | 346
Less Than 12 Months, Gross Unrealized Losses | (18) | (3)
Greater Than 12 Months, Fair Value | 249 |
Greater Than 12 Months, Gross Unrealized Losses | (13) |
Total, Fair Value | 2,225 | 346
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (31) | (3)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,386 |
Less Than 12 Months, Gross Unrealized Losses | (19) |
Greater Than 12 Months, Fair Value | 31 |
Greater Than 12 Months, Gross Unrealized Losses | (1) |
Total, Fair Value | 1,417 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (20) |
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 9,357 | 1,273
Less Than 12 Months, Gross Unrealized Losses | (130) | (9)
Greater Than 12 Months, Fair Value | 376 | 456
Greater Than 12 Months, Gross Unrealized Losses | (15) | (3)
Total, Fair Value | 9,733 | 1,729
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (145) | (12)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 3,078 | 601
Less Than 12 Months, Gross Unrealized Losses | (52) | (3)
Greater Than 12 Months, Fair Value | 116 | 0
Greater Than 12 Months, Gross Unrealized Losses | (3) | 0
Total, Fair Value | 3,194 | 601
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (55) | (3)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,321 | 195
Less Than 12 Months, Gross Unrealized Losses | (18) | (1)
Greater Than 12 Months, Fair Value | 114 | 93
Greater Than 12 Months, Gross Unrealized Losses | (5) | (3)
Total, Fair Value | 1,435 | 288
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (23) | $ (4)

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