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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019
 
As of December 31, 2018
 
 
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
 
$
70,599

 
$
171

 
$
22,538

 
$
(823
)
 
$
71,416

 
$
438

 
$
21,253

 
$
(740
)
Receive-fixed
 
89,157

 
1,037

 
53,059

 
(541
)
 
88,799

 
1,113

 
58,399

 
(860
)
Basis
 
273

 
129

 
—

 
—

 
250

 
104

 
624

 
—

Foreign currency
 
226

 
35

 
228

 
(66
)
 
221

 
22

 
223

 
(72
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
 
5,350

 
46

 
5,625

 
(45
)
 
10,375

 
191

 
1,000

 
(4
)
Receive-fixed
 
1,100

 
51

 
6,375

 
(287
)
 
500

 
20

 
7,375

 
(338
)
Futures(1)
 
21,594

 
—

 
—

 
—

 
16,631

 
—

 
—

 
—

Total gross risk management derivatives
 
188,299

 
1,469

 
87,825

 
(1,762
)
 
188,192

 
1,888

 
88,874

 
(2,014
)
Accrued interest receivable (payable)
 
—

 
395

 
—

 
(462
)
 
—

 
400

 
—

 
(419
)
Netting adjustment(2)
 
—

 
(1,781
)
 
—

 
2,126

 
—

 
(2,266
)
 
—

 
2,315

Total net risk management derivatives
 
$
188,299

 
$
83

 
$
87,825

 
$
(98
)
 
$
188,192

 
$
22

 
$
88,874

 
$
(118
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
 
$
3,901

 
$
26

 
$
2,153

 
$
(3
)
 
$
4,370

 
$
29

 
$
57

 
$
—

Forward contracts to purchase mortgage-related securities
 
53,514

 
403

 
9,649

 
(10
)
 
40,650

 
349

 
1,045

 
(3
)
Forward contracts to sell mortgage-related securities
 
10,547

 
10

 
86,515

 
(653
)
 
292

 
1

 
70,593

 
(645
)
Total mortgage commitment derivatives
 
67,962

 
439

 
98,317

 
(666
)
 
45,312

 
379

 
71,695

 
(648
)
Credit enhancement derivatives
 
32,745

 
62

 
2,874

 
(29
)
 
33,431

 
57

 
919

 
(11
)
Derivatives at fair value
 
$
289,006

 
$
584

 
$
189,016

 
$
(793
)
 
$
266,935

 
$
458

 
$
161,488

 
$
(777
)
(1) 
Futures have no ascribable fair value because 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 $882 million and $713 million as of March 31, 2019 and December 31, 2018, respectively. Cash collateral received was $537 million and $664 million as of March 31, 2019 and December 31, 2018, 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 Three Months Ended March 31,
 
 
 
 
2019
 
2018
 
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
Swaps:
 
 
 
 
Pay-fixed
 
$
(1,335
)
 
$
2,783

Receive-fixed
 
1,281

 
(2,387
)
Basis
 
24

 
(23
)
Foreign currency
 
19

 
16

Swaptions:
 
 
 
 
Pay-fixed
 
(177
)
 
129

Receive-fixed
 
7

 
(16
)
Futures
 
59

 
8

Net accrual of periodic settlements
 
(266
)
 
(215
)
Total risk management derivatives fair value gains (losses), net
 
(388
)
 
295

Mortgage commitment derivatives fair value gains (losses), net
 
(300
)
 
564

Credit enhancement derivatives fair value gains (losses), net
 
(7
)
 
4

Total derivatives fair value gains (losses), net
 
$
(695
)
 
$
863