Receivables - TDR Loans (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Unpaid principal balance subject to reduction	$ 549		$ 92
TDR Loans held for investment, recorded at the lower of amortized cost or FV less cost to sell	517		604
Real Estate Secured [Member] | Receivables Held For Sale [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	650	[1],[2],[3]	1,392	[1],[2],[3]
Receivables Held For Sale [Member] | Real Estate Secured [Member]
Financing Receivable, Modifications [Line Items]
Unpaid balance of TDR loans	1,004		2,587
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	11,195	[1],[2]	13,072	[1],[2]
Credit loss reserves for TDR loans	1,982	[3],[4]	2,654	[3],[4]
Unpaid balance of TDR loans	11,985		14,758
First Lien [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	9,630	[1],[2],[5]	10,633	[1],[2],[5]
Credit loss reserves for TDR loans	1,738	[4]	2,294	[4]
Unpaid balance of TDR loans	9,931		10,983
Second Lien [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	915	[1],[2],[5]	1,047	[1],[2],[5]
Credit loss reserves for TDR loans	244	[4]	360	[4]
Unpaid balance of TDR loans	$ 1,050		$ 1,188

[1] The TDR Loan balances included in the table above reflect the current carrying amount of TDR Loans and includes all basis adjustments on the loan, such as unearned income, unamortized deferred fees and costs on originated loans and premiums or discounts on purchased loans as well as any charge-off recorded in accordance with our existing charge-off policies. Additionally, the carrying amount of TDR Loans classified as held for sale has been reduced by both the lower of amortized cost or fair value adjustment as well as the credit loss reserves associated with these receivables prior to the transfer. The following table reflects the unpaid principal balance of TDR Loans. Real Estate Secured: First lien $9,931 and $10,983 at December 31, 2014 and December 31, 2013, respectively; Second lien $1,050 and $1,188 at December 31, 2014 and December 31, 2013, respectively; Real estate secured receivables held for sale $1,004 and $2,587 at December 31, 2014 and December 31, 2013, respectively; Total real estate secured $11,985 and $14,758 at December 31, 2014 and December 31, 2013, respectively. At December 31, 2014 and December 31, 2013, the unpaid principal balances reflected above include $549 million and $92 million, respectively, which has received a reduction in the unpaid principal balance as part of an account management action.

[2] TDR Loans are considered to be impaired loans regardless of accrual status.

[3] There are no credit loss reserves associated with receivables classified as held for sale as they are carried at the lower of amortized cost or fair value.

[4] Included in credit loss reserves.

[5] At December 31, 2014 and December 31, 2013, TDR Loans held for investment totaling $517 million and $604 million, respectively, are recorded at the lower of amortized cost or fair value of the collateral less cost to sell.