Allowance for Loan Losses Allowance at Recorded Investment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for individually impaired loans	$ 37,729	[1],[2]	$ 45,034	[1],[2]
Allowance for loan losses for collectively reserved loans	6,117		13,761
Allowance for loan losses	43,846		58,795		72,156	61,556
Recorded investment in individually impaired loans	193,279	[2],[3]	200,391	[2],[3]
Recorded investment in collectively reserved loans	2,871,390	[3]	2,807,080	[3]
Total recorded investment in loans	3,064,669	[3]	3,007,471	[3]
Single-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for individually impaired loans	37,423	[2]	44,545	[2]
Allowance for loan losses for collectively reserved loans	5,884		13,142
Allowance for loan losses	43,307		57,687		70,633	59,980
Recorded investment in individually impaired loans	189,064	[2],[3]	195,852	[2],[3]
Recorded investment in collectively reserved loans	2,689,627	[3]	2,620,568	[3]
Total recorded investment in loans	2,878,691	[3]	2,816,420	[3]
Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for individually impaired loans	306	[2]	489	[2]
Allowance for loan losses for collectively reserved loans	233		619
Allowance for loan losses	539		1,108		1,523	1,576
Recorded investment in individually impaired loans	4,215	[2],[3]	4,539	[2],[3]
Recorded investment in collectively reserved loans	181,763	[3]	186,512	[3]
Total recorded investment in loans	$ 185,978	[3]	$ 191,051	[3]

[1] Includes single-family loans restructured in a TDR with a recorded investment of $187.6 billion, $193.4 billion and $161.9 billion as of December 31, 2013, 2012 and 2011, respectively. Includes multifamily loans restructured in a TDR with a recorded investment of $911 million, $1.1 billion and $956 million as of December 31, 2013, 2012 and 2011, respectively.

[2] Includes acquired credit-impaired loans.

[3] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.