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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Notional and Fair Value Position [Table Text Block]
The following table displays the notional amount and estimated fair value of our asset and liability derivative instruments as of March 31, 2013 and December 31, 2012.

As of March 31, 2013
 
As of December 31, 2012

Asset Derivatives
 
Liability Derivatives
 
Asset Derivatives
 
Liability Derivatives

Notional Amount
 
Estimated Fair Value
 
Notional Amount
 
Estimated Fair Value
 
Notional Amount
 
Estimated Fair Value
 
Notional Amount
 
Estimated Fair Value

(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Swaps:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
$
32,285

 
$
775

 
$
226,697

 
$
(15,712
)
 
$
19,450

 
$
270

 
$
239,017

 
$
(18,237
)
Receive-fixed
199,209

 
8,740

 
110,705

 
(572
)
 
231,346

 
10,514

 
57,190

 
(200
)
Basis
18,699

 
124

 
8,200

 
(1
)
 
23,199

 
151

 
1,700

 
—

Foreign currency
577

 
149

 
539

 
(67
)
 
686

 
193

 
509

 
(45
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
32,550

 
114

 
50,575

 
(300
)
 
33,050

 
102

 
36,225

 
(184
)
Receive-fixed
15,720

 
3,332

 
50,575

 
(2,209
)
 
15,970

 
3,572

 
36,225

 
(2,279
)
Other(1)
6,859

 
36

 
12

 
—

 
7,374

 
26

 
13

 
(1
)
Total gross risk management derivatives
305,899

 
13,270

 
447,303

 
(18,861
)
 
331,075

 
14,828

 
370,879

 
(20,946
)
Accrued interest receivable (payable)
—

 
1,361

 
—

 
(1,494
)
 
—

 
1,242

 
—

 
(1,508
)
Netting adjustment(2)
—

 
(14,334
)
 
—

 
19,911

 
—

 
(15,791
)
 
—

 
22,046

Total net risk management derivatives
$
305,899

 
$
297

 
$
447,303

 
$
(444
)
 
$
331,075

 
$
279

 
$
370,879

 
$
(408
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
$
8,981

 
$
29

 
$
4,432

 
$
(12
)
 
$
12,360

 
$
27

 
$
5,232

 
$
(8
)
Forward contracts to purchase mortgage-related securities
38,738

 
154

 
9,761

 
(24
)
 
34,545

 
103

 
12,557

 
(23
)
Forward contracts to sell mortgage-related securities
15,553

 
39

 
72,213

 
(300
)
 
18,886

 
26

 
75,477

 
(266
)
Total mortgage commitment derivatives
$
63,272

 
$
222

 
$
86,406

 
$
(336
)
 
$
65,791

 
$
156

 
$
93,266

 
$
(297
)
Derivatives at fair value
$
369,171

 
$
519

 
$
533,709

 
$
(780
)
 
$
396,866

 
$
435

 
$
464,145

 
$
(705
)
__________
(1) 
Includes interest rate caps, futures, swap credit enhancements and mortgage insurance contracts that we account for as derivatives. The mortgage insurance contracts have payment provisions that are not based on a notional amount.
(2) 
The netting adjustment represents the effect of the legal right to offset under legally enforceable master netting agreements to settle with the same counterparty on a net basis, including cash collateral posted and received. Cash collateral posted was $5.6 billion and $6.3 billion as of March 31, 2013 and December 31, 2012, respectively. No cash collateral was received as of March 31, 2013 and December 31, 2012.
Fair Value Gain (Loss), Net [Table Text Block]
The following table displays, by type of derivative instrument, the fair value gains and losses, net on our derivatives for the three months ended March 31, 2013 and 2012.
 
For the
 
Three Months
 
Ended March 31,
 
2013
 
2012
 
(Dollars in millions)
Risk management derivatives:
 
 
 
Swaps:
 
 
 
Pay-fixed
$
1,392

 
$
1,175

Receive-fixed
(928
)
 
(918
)
Basis
(17
)
 
38

Foreign currency
(66
)
 
1

Swaptions:
 
 
 
Pay-fixed
17

 
(22
)
Receive-fixed
21

 
(94
)
Other(1)
12

 
(1
)
Total risk management derivatives fair value gains, net
431

 
179

Mortgage commitment derivatives fair value gains (losses), net
131

 
(205
)
Total derivatives fair value gains (losses), net
$
562

 
$
(26
)
__________
(1) 
Includes interest rate caps, futures, swap credit enhancements and mortgage insurance contracts.