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Summary Of Significant Accounting Policies (Schedule Of Allowance For Uncollectible Accounts) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Accounting Policies [Abstract] | |||
| Allowances, beginning of year | $ 1us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | $ 1us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | $ 1us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts |
| Amounts charged to expense | 8us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsProvisionChargedToExpense1 | 3us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsProvisionChargedToExpense1 | 1us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsProvisionChargedToExpense1 |
| Write-offs of uncollectible receivables | (4)us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance | (3)us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance | (1)us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance |
| Allowances, end of year | $ 5us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | $ 1us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | $ 1us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts |
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- Details
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- Definition
The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of expense for known and estimated loss on collection of premiums receivable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of decrease during the period to the valuation allowance account representing portions of such account associated with premium receivables that have been determined to be absolutely uncollectible or that were sold or transferred, and which receivables were simultaneously written off. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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