Customer Financing (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Millions |
Jun. 30, 2015 |
Dec. 31, 2014 |
---|---|---|
Financing Receivable, Recorded Investment [Line Items] | ||
Carrying value of financing receivables | $ 1,813 | $ 1,905 |
B B B Credit Rating [Member] | ||
Financing Receivable, Recorded Investment [Line Items] | ||
Carrying value of financing receivables | 1,009 | 1,055 |
B Credit Rating [Member] | ||
Financing Receivable, Recorded Investment [Line Items] | ||
Carrying value of financing receivables | 612 | 633 |
C C C Credit Rating [Member] | ||
Financing Receivable, Recorded Investment [Line Items] | ||
Carrying value of financing receivables | 103 | 131 |
Other Credit Rating [Member] | ||
Financing Receivable, Recorded Investment [Line Items] | ||
Carrying value of financing receivables | $ 89 | $ 86 |