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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
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Fair Value - Less than six months $ 50 $ 63
Fair Value - Six months or greater, but less than nine months 52 2
Fair Value - Nine months or greater, but less than twelve months 1 23
Fair Value - Twelve months or greater 27 30
Fair Value - Total 130 118
Gross Unrealized Losses - Less than six months 16 23
Gross Unrealized Losses - Six months or greater, but less than nine months 23 1
Gross Unrealized Losses - Nine months or greater, but less than twelve months 1 7
Gross Unrealized Losses - Twelve months or greater 8 11
Gross Unrealized Losses - Total $ 48 $ 42
Number of Securities - Less than six months | security 10 14
Number of Securities - Six months or greater, but less than nine months | security 4 4
Number of Securities - Nine months or greater, but less than twelve months | security 3 14
Number of Securities - Twelve months or greater | security 28 20
Number of Securities - Total | security 45 52