Customer Financing (Financing Receivable Credit Quality Indicators) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables	$ 2,286	$ 2,442
BBB Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables	1,091	1,201
BB Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables	58	63
B Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables	585	51
CCC Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables	457	511
D Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables		524
Other Credit Rating [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Financing Receivables	$ 95	$ 92