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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016
 
As of December 31, 2015
 
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
$
29,540

 
$
660

 
$
94,584

 
$
(4,396
)
 
$
33,154

 
$
267

 
$
123,106

 
$
(6,920
)
Receive-fixed
30,207

 
2,696

 
135,470

 
(1,552
)
 
59,796

 
3,436

 
143,209

 
(753
)
Basis
1,624

 
115

 
15,600

 
(11
)
 
1,864

 
141

 
17,100

 
(15
)
Foreign currency
214

 
40

 
216

 
(85
)
 
295

 
95

 
258

 
(52
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
9,600

 
241

 
4,850

 
(82
)
 
7,050

 
45

 
14,950

 
(26
)
Receive-fixed
—

 
—

 
10,100

 
(257
)
 
2,000

 
8

 
13,950

 
(171
)
Other(1)
15,087

 
33

 
655

 
(2
)
 
9,196

 
28

 
—

 
(2
)
Total gross risk management derivatives
86,272

 
3,785

 
261,475

 
(6,385
)
 
113,355

 
4,020

 
312,573

 
(7,939
)
Accrued interest receivable (payable)
—

 
785

 
—

 
(937
)
 
—

 
758

 
—

 
(977
)
Netting adjustment(2)
—

 
(4,514
)
 
—

 
6,844

 
—

 
(4,024
)
 
—

 
8,650

Total net risk management derivatives
$
86,272

 
$
56

 
$
261,475

 
$
(478
)
 
$
113,355

 
$
754

 
$
312,573

 
$
(266
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
$
4,753

 
$
28

 
$
3,039

 
$
(49
)
 
$
4,815

 
$
9

 
$
2,960

 
$
(9
)
Forward contracts to purchase mortgage-related securities
31,635

 
198

 
27,297

 
(388
)
 
31,273

 
66

 
19,418

 
(57
)
Forward contracts to sell mortgage-related securities
34,103

 
405

 
47,645

 
(300
)
 
26,224

 
65

 
40,753

 
(92
)
Total mortgage commitment derivatives
70,491

 
631

 
77,981

 
(737
)
 
62,312

 
140

 
63,131

 
(158
)
Derivatives at fair value
$
156,763

 
$
687

 
$
339,456

 
$
(1,215
)
 
$
175,667

 
$
894

 
$
375,704

 
$
(424
)
__________
(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 $2.9 billion and $4.9 billion as of December 31, 2016 and 2015, respectively. Cash collateral received was $535 million and $314 million as of December 31, 2016 and 2015, 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,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
Swaps:
 
 
 
 
 
Pay-fixed
$
757

 
$
(746
)
 
$
(7,703
)
Receive-fixed
(751
)
 
625

 
4,229

Basis
(21
)
 
4

 
85

Foreign currency
(76
)
 
(60
)
 
27

Swaptions:
 
 
 
 
 
Pay-fixed
163

 
135

 
(4
)
Receive-fixed
(230
)
 
(93
)
 
(197
)
Other
160

 
(25
)
 
1

Net accrual of periodic settlements
(1,125
)
 
(960
)
 
(1,062
)
Total risk management derivatives fair value losses, net
(1,123
)
 
(1,120
)
 
(4,624
)
Mortgage commitment derivatives fair value gains (losses), net
288

 
(393
)
 
(1,140
)
Total derivatives fair value losses, net
$
(835
)
 
$
(1,513
)
 
$
(5,764
)