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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018
 
As of December 31, 2017
 
 
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
 
$
71,416

 
$
438

 
$
21,253

 
$
(740
)
 
$
52,732

 
$
772

 
$
70,211

 
$
(2,120
)
Receive-fixed
 
88,799

 
1,113

 
58,399

 
(860
)
 
31,671

 
2,391

 
138,852

 
(1,764
)
Basis
 
250

 
104

 
624

 

 
873

 
124

 

 

Foreign currency
 
221

 
22

 
223

 
(72
)
 
234

 
59

 
236

 
(56
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
 
10,375

 
191

 
1,000

 
(4
)
 
9,750

 
95

 
4,000

 
(20
)
Receive-fixed
 
500

 
20

 
7,375

 
(338
)
 
250

 
13

 
9,250

 
(304
)
Futures(1)
 
 
16,631

 

 

 

 

 

 
7,315

 

Total gross risk management derivatives
 
188,192

 
1,888

 
88,874

 
(2,014
)
 
95,510

 
3,454

 
229,864

 
(4,264
)
Accrued interest receivable (payable)
 

 
400

 

 
(419
)
 

 
835

 

 
(814
)
Netting adjustment(2)
 

 
(2,266
)
 

 
2,315

 

 
(4,272
)
 

 
4,979

Total net risk management derivatives
 
$
188,192

 
$
22

 
$
88,874

 
$
(118
)
 
$
95,510

 
$
17

 
$
229,864

 
$
(99
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
 
$
4,370

 
$
29

 
$
57

 
$

 
$
4,143

 
$
9

 
$
1,570

 
$
(2
)
Forward contracts to purchase mortgage-related securities
 
40,650

 
349

 
1,045

 
(3
)
 
45,925

 
108

 
21,099

 
(21
)
Forward contracts to sell mortgage-related securities
 
292

 
1

 
70,593

 
(645
)
 
19,320

 
15

 
85,556

 
(205
)
Total mortgage commitment derivatives
 
45,312

 
379

 
71,695

 
(648
)
 
69,388

 
132

 
108,225

 
(228
)
Credit enhancement derivatives
 
33,431

 
57

 
919

 
(11
)
 
13,240

 
22

 

 
(1
)
Derivatives at fair value
 
$
266,935

 
$
458

 
$
161,488

 
$
(777
)
 
$
178,138

 
$
171

 
$
338,089

 
$
(328
)

(1) 
Futures have no ascribable fair value since the positions are settled daily.
(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 $713 million and $1.4 billion as of December 31, 2018 and 2017, respectively. Cash collateral received was $664 million and $649 million as of December 31, 2018 and 2017, 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,
 
 
2018
 
2017
 
2016
 
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
 
Swaps:
 
 
 
 
 
 
Pay-fixed
 
$
2,940

 
$
1,296

 
$
757

Receive-fixed
 
(1,834
)
 
(851
)
 
(751
)
Basis
 
(21
)
 
21

 
(21
)
Foreign currency
 
(51
)
 
49

 
(76
)
Swaptions:
 
 
 
 
 
 
Pay-fixed
 
100

 
(161
)
 
163

Receive-fixed
 
(39
)
 
(60
)
 
(230
)
Futures
 
38

 
22

 
154

Net accrual of periodic settlements
 
(1,061
)
 
(889
)
 
(1,125
)
Total risk management derivatives fair value gains (losses), net
 
72

 
(573
)
 
(1,129
)
Mortgage commitment derivatives fair value gains (losses), net
 
324

 
(603
)
 
288

Credit enhancement derivatives fair value gains (losses), net
 
26

 
(9
)
 
6

Total derivatives fair value gains (losses), net
 
$
422

 
$
(1,185
)
 
$
(835
)