Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Accounting Policies [Abstract]
Number of reportable segments \| segment	2
Period of origination of loans within which they are sold to investors	30 days
Days past due for loans to be placed on non-accrual status	90 days
Allowance for doubtful accounts	$ 5	$ 4
Custodial Accounts
Customer escrow funds and custodial funds due to investors	$ 3,500	$ 3,400
Capitalized software \| Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	3 years
Capitalized software \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	5 years
Capital leases \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	5 years
Furniture, fixtures and equipment \| Minimum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	3 years
Furniture, fixtures and equipment \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	7 years
Leasehold improvements \| Maximum
PROPERTY, PLANT AND EQUIPMENT
Estimated useful life	20 years

No definition available.

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- Definition

Amounts held in escrow and custodial funds due to investors that are not included in the Balance Sheet amounts. These amounts are maintained in segregated bank accounts.

+ References

No definition available.

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- Definition

Represents the number of days from when a loan is originated to when a loan is generally sold to an investor.

+ References

No definition available.

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- Definition

Threshold period past due for financing receivable for placing loans on non accrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P90D' represents the reported fact of ninety days.

+ References

No definition available.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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