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Notes Receivable (Schedule Of Allowance For Loan Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Notes Receivable [Abstract]    
Allowance for loan losses, at beginning of period $ 9 $ 8
Charge-offs (14) (8)
Recoveries 2 1
Provision for loan losses 19 8
Allowance for loan losses, at end of period $ 16 $ 9