Receivables - TDR Loans (Detail) (USD $)	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
TDR Loans	$ 16,567,000,000	[1],[2],[3],[4]	$ 16,404,000,000	[1],[2],[3],[4]
Credit loss reserves for TDR loans	3,439,000,000	[2],[4]	3,627,000,000	[2],[4]
Total modifications unpaid principal	20,794,000,000		20,935,000,000
TDR Loans held for investment	1,700,000,000		1,500,000,000
First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	14,843,000,000	[1],[3],[4]	14,607,000,000	[1],[3],[4]
Credit loss reserves for TDR loans	2,953,000,000		3,104,000,000
Total modifications unpaid principal	18,402,000,000		18,451,000,000
Second Mortgage [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	1,177,000,000	[1],[3],[4]	1,205,000,000	[1],[3],[4]
Credit loss reserves for TDR loans	486,000,000		523,000,000
Total modifications unpaid principal	1,321,000,000		1,345,000,000
Real estate secured [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	16,020,000,000	[1],[3],[4],[5]	15,812,000,000	[1],[3],[4],[5]
Credit loss reserves for TDR loans	3,439,000,000		3,627,000,000
Total modifications unpaid principal	19,723,000,000		19,796,000,000
Personal non-credit card [Member]
Financing Receivable, Modifications [Line Items]
TDR Loans	547,000,000	[1],[3],[4]	592,000,000	[1],[3],[4]
Total modifications unpaid principal	1,071,000,000		1,139,000,000
Receivables Held For Sale [Member]
Financing Receivable, Modifications [Line Items]
Total modifications unpaid principal	2,700,000,000		2,500,000,000
Receivables Held For Sale [Member] | Real Estate Owned [Member]
Financing Receivable, Modifications [Line Items]
Total modifications unpaid principal	$ 2,200,000,000		$ 1,900,000,000

[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.

[2] Included in credit loss reserves.

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

[4] At March 31, 2013 and December 31, 2012, $2.7 billion (including $2.2 billion of real estate secured receivables) and $2.5 billion (including $1.9 billion of real estate secured receivables) of TDR Loans were reported as receivables held for sale for which there are no credit loss reserves as they are carried at the lower of amortized cost or fair value.

[5] At March 31, 2013 and December 31, 2012, TDR Loans held for investment totaling $1.7 billion and $1.5 billion, respectively, are recorded at the lower of amortized cost or fair value of the collateral less cost to sell.