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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
 
As of December 31, 2016
 
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
$
52,732

 
$
772

 
$
70,211

 
$
(2,120
)
 
$
29,540

 
$
660

 
$
94,584

 
$
(4,396
)
Receive-fixed
31,671

 
2,391

 
138,852

 
(1,764
)
 
30,207

 
2,696

 
135,470

 
(1,552
)
Basis
873

 
124

 
—

 
—

 
1,624

 
115

 
15,600

 
(11
)
Foreign currency
234

 
59

 
236

 
(56
)
 
214

 
40

 
216

 
(85
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
9,750

 
95

 
4,000

 
(20
)
 
9,600

 
241

 
4,850

 
(82
)
Receive-fixed
250

 
13

 
9,250

 
(304
)
 
—

 
—

 
10,100

 
(257
)
Other(1)
13,240

 
22

 
7,315

 
(1
)
 
15,087

 
33

 
655

 
(2
)
Total gross risk management derivatives
108,750

 
3,476

 
229,864

 
(4,265
)
 
86,272

 
3,785

 
261,475

 
(6,385
)
Accrued interest receivable (payable)
—

 
835

 
—

 
(814
)
 
—

 
785

 
—

 
(937
)
Netting adjustment(2)
—

 
(4,272
)
 
—

 
4,979

 
—

 
(4,514
)
 
—

 
6,844

Total net risk management derivatives
$
108,750

 
$
39

 
$
229,864

 
$
(100
)
 
$
86,272

 
$
56

 
$
261,475

 
$
(478
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
$
4,143

 
$
9

 
$
1,570

 
$
(2
)
 
$
4,753

 
$
28

 
$
3,039

 
$
(49
)
Forward contracts to purchase mortgage-related securities
45,925

 
108

 
21,099

 
(21
)
 
31,635

 
198

 
27,297

 
(388
)
Forward contracts to sell mortgage-related securities
19,320

 
15

 
85,556

 
(205
)
 
34,103

 
405

 
47,645

 
(300
)
Total mortgage commitment derivatives
69,388

 
132

 
108,225

 
(228
)
 
70,491

 
631

 
77,981

 
(737
)
Derivatives at fair value
$
178,138

 
$
171

 
$
338,089

 
$
(328
)
 
$
156,763

 
$
687

 
$
339,456

 
$
(1,215
)
__________
(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 $1.4 billion and $2.9 billion as of December 31, 2017 and 2016, respectively. Cash collateral received was $649 million and $535 million as of December 31, 2017 and 2016, 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,
 
2017
 
2016
 
2015
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
Swaps:
 
 
 
 
 
Pay-fixed
$
1,296

 
$
757

 
$
(746
)
Receive-fixed
(851
)
 
(751
)
 
625

Basis
21

 
(21
)
 
4

Foreign currency
49

 
(76
)
 
(60
)
Swaptions:
 
 
 
 
 
Pay-fixed
(161
)
 
163

 
135

Receive-fixed
(60
)
 
(230
)
 
(93
)
Other
13

 
160

 
(25
)
Net accrual of periodic settlements
(889
)
 
(1,125
)
 
(960
)
Total risk management derivatives fair value losses, net
(582
)
 
(1,123
)
 
(1,120
)
Mortgage commitment derivatives fair value gains (losses), net
(603
)
 
288

 
(393
)
Total derivatives fair value losses, net
$
(1,185
)
 
$
(835
)
 
$
(1,513
)