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Notes Receivable (Schedule Of Allowance For Loan Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Notes Receivable [Abstract]    
Allowance for loan losses, at beginning of period $ 8 $ 5
Charge-offs (8) (6)
Recoveries 1 1
Provision for loan losses 8 8
Allowance for loan losses, at end of period $ 9 $ 8