Receivables - Aging Analysis of Past Due Loans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Apr. 30, 2013 platform	Mar. 31, 2013 platform	Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total receivables	$ 26,584				$ 32,939		$ 47,912
Threshold period for current receivable	30 days
Number of mortgage loan servicing platforms			1	2
Real estate secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, 30 - 89 days past due	2,711	[1]			3,075	[1]
Financing Receivable, 90 plus days past due	1,730	[1]			2,987	[1]
Financing Receivable, Past Due, Total	4,441	[1]			6,062	[1]
Financing Receivable, Current	22,143	[1],[2]			26,877	[1],[2]
Total receivables	26,584	[1],[3]			32,939	[1],[3]
First Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, 30 - 89 days past due	2,462				2,759
Financing Receivable, 90 plus days past due	1,538				2,748
Financing Receivable, Past Due, Total	4,000				5,507
Financing Receivable, Current	19,568	[2]			23,794	[2]
Total receivables	23,568	[3]			29,301	[3]
Second Lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, 30 - 89 days past due	249				316
Financing Receivable, 90 plus days past due	192				239
Financing Receivable, Past Due, Total	441				555
Financing Receivable, Current	2,575	[2]			3,083	[2]
Total receivables	$ 3,016	[3]			$ 3,638	[3]

[1] Our real estate secured receivables have historically been maintained on two mortgage loan servicing platforms which resulted in differences relating to how contractual delinquency was determined. In April 2013, we moved all closed-end real estate secured receivables onto one platform which resulted in the substantial majority of our real estate secured receivables utilizing the same platform.

[2] Receivables less than 30 days past due are presented as current.

[3] The receivable balances included in this table reflects the principal amount outstanding on the loan and certain basis adjustments to the loan such as deferred fees and costs on originated loans, purchase accounting fair value adjustments and premiums or discounts on purchased loans. However, these basis adjustments on the loans are excluded in other presentations of dollars of two-months-and-over contractual delinquency and nonperforming receivable account balances.