Long-term Customer Financing and Sales Of Receivables (Narrative) (Details) (USD $)	Dec. 31, 2014 loan	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Interest income recognized on long-term receivables	$ 1,000,000	$ 0	$ 5,000,000
Commitments to provide long-term financing	293,000,000	50,000,000
Servicing obligations for long-term receivables	496,000,000	434,000,000
Financing receivables past due over 90 days	$ 12,000,000	$ 10,000,000
Loans with receivable over 90 days past due	2