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Employee Benefit Plans (Summary of Changes in the Corporation's Qualified Defined Benefit Pension Plan's Level 3 Investments Measured at Fair Value on a Recurring Basis) (Details) - Private placements - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Balance at beginning of period $ 50 $ 58
Gains (Losses) Realized (3) 2
Gains (Losses) Unrealized (12) (4)
Purchases 38 44
Sales (34) (50)
Balance at end of period $ 39 $ 50