Variable Interest Entities (VIEs) (Details) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
|
Jun. 30, 2015
USD ($)
|
Jun. 30, 2016
USD ($)
loan
entity
|
Jun. 30, 2015
USD ($)
|
Dec. 31, 2015
USD ($)
loan
|
Dec. 31, 2014
USD ($)
loan
|
Dec. 31, 2013
USD ($)
|
|
| HELOC Securitizations | ||||||
| Private-label Securitizations [Line Items] | ||||||
| Payments for Legal Settlements | $ 52 | |||||
| FSTAR 2007-1 Mortgage Securitization | ||||||
| Securitized Loans [Abstract] | ||||||
| Number of loans | loan | 2,762 | 3,061 | 3,624 | |||
| Aggregate principal balance | $ 103 | $ 117 | $ 141 | |||
| Variable Interest Entity, Number of Entities | entity | 1 | |||||
| Recurring | Level 3 | ||||||
| Private-label Securitizations [Line Items] | ||||||
| Sales | $ 24 | $ 24 | 52 | 0 | $ 0 | |
| Long-term debt | Recurring | Level 3 | ||||||
| Private-label Securitizations [Line Items] | ||||||
| Sales | $ 24 | $ 24 | $ 52 | $ 0 | $ 0 | |