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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) - Fair Value Decline, Greater Than 20% [Member]
$ in Millions
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Fair Value - Less than six months $ 9 $ 63
Fair Value - Six months or greater, but less than nine months 17 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 60 30
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 86 118
Gross Unrealized Losses - Less than six months 2 23
Gross Unrealized Losses - Six months or greater, but less than nine months 5 1
Less Than or Equal to Twelve Months   7
Greater Than Twelve Months 9 11
Fair Value - Total $ 16 $ 42
Number of Securities - Less than six months | security 4 14
Number of Securities - Six months or greater, but less than nine months | security 1 4
Number of Securities - Nine months or greater, but less than twelve months | security   14
Number of Securities - Twelve months or greater | security 25 20
Number of Securities - Total | security 30 52