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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
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 December 31, 2015
 
As of December 31, 2014
 
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
$
33,154

 
$
267

 
$
123,106

 
$
(6,920
)
 
$
41,965

 
$
733

 
$
123,557

 
$
(7,125
)
Receive-fixed
59,796

 
3,436

 
143,209

 
(753
)
 
67,629

 
4,486

 
157,272

 
(1,302
)
Basis
1,864

 
141

 
17,100

 
(15
)
 
5,769

 
123

 
7,100

 
(2
)
Foreign currency
295

 
95

 
258

 
(52
)
 
344

 
144

 
273

 
(30
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
7,050

 
45

 
14,950

 
(26
)
 
11,100

 
57

 
26,525

 
(175
)
Receive-fixed
2,000

 
8

 
13,950

 
(171
)
 
750

 
96

 
29,525

 
(816
)
Other(1)
9,196

 
28

 
—

 
(2
)
 
1,071

 
28

 
12

 
(1
)
Total gross risk management derivatives
113,355

 
4,020

 
312,573

 
(7,939
)
 
128,628

 
5,667

 
344,264

 
(9,451
)
Accrued interest receivable (payable)
—

 
758

 
—

 
(977
)
 
—

 
749

 
—

 
(1,013
)
Netting adjustment(2)
—

 
(4,024
)
 
—

 
8,650

 
—

 
(5,186
)
 
—

 
10,194

Total net risk management derivatives
$
113,355

 
$
754

 
$
312,573

 
$
(266
)
 
$
128,628

 
$
1,230

 
$
344,264

 
$
(270
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
$
4,815

 
$
9

 
$
2,960

 
$
(9
)
 
$
6,157

 
$
28

 
$
428

 
$
—

Forward contracts to purchase mortgage-related securities
31,273

 
66

 
19,418

 
(57
)
 
43,533

 
223

 
6,112

 
(8
)
Forward contracts to sell mortgage-related securities
26,224

 
65

 
40,753

 
(92
)
 
4,886

 
4

 
57,910

 
(336
)
Total mortgage commitment derivatives
62,312

 
140

 
63,131

 
(158
)
 
54,576

 
255

 
64,450

 
(344
)
Derivatives at fair value
$
175,667

 
$
894

 
$
375,704

 
$
(424
)
 
$
183,204

 
$
1,485

 
$
408,714

 
$
(614
)
__________
(1) 
Includes futures and swap credit enhancements, as well as credit risk transfer transactions and mortgage insurance contracts that we account for as derivatives.
(2) 
The netting adjustment represents the effect of the legal right to offset under legally enforceable master netting arrangements to settle with the same counterparty on a net basis, including cash collateral posted and received. Cash collateral posted was $4.9 billion and $5.3 billion as of December 31, 2015 and 2014, respectively. Cash collateral received was $314 million and $245 million as of December 31, 2015 and 2014, respectively.
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 Year Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
Swaps:
 
 
 
 
 
Pay-fixed
$
(746
)
 
$
(7,703
)
 
$
14,393

Receive-fixed
625

 
4,229

 
(10,721
)
Basis
4

 
85

 
(115
)
Foreign currency
(60
)
 
27

 
(101
)
Swaptions:
 
 
 
 
 
Pay-fixed
135

 
(4
)
 
(238
)
Receive-fixed
(93
)
 
(197
)
 
307

Other
(25
)
 
1

 
21

Accrual of periodic settlements:
 
 
 
 
 
Pay-fixed interest-rate swaps
(3,602
)
 
(3,712
)
 
(4,463
)
Receive-fixed interest-rate swaps
2,603

 
2,600

 
3,632

Other
39

 
50

 
64

Total risk management derivatives fair value gains (losses), net
(1,120
)
 
(4,624
)
 
2,779

Mortgage commitment derivatives fair value gains (losses), net
(393
)
 
(1,140
)
 
501

Total derivatives fair value gains (losses), net
$
(1,513
)
 
$
(5,764
)
 
$
3,280