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Netting Arrangements (Tables)
 12 Months Ended
Dec. 31, 2017
Offsetting [Abstract]  
Offsetting [Table Text Block]
The tables below display information related to derivatives, securities purchased under agreements to resell or similar arrangements, and securities sold under agreements to repurchase or similar arrangements, which are subject to an enforceable master netting arrangement or similar agreement that are either offset or not offset in our consolidated balance sheets.
 
As of December 31, 2017
 
 
 
 
Gross Amount Offset(1)
 
 
Net Amount Presented in our Consolidated Balance Sheets
 
Amounts Not Offset in our Consolidated Balance Sheets
 
 
 
Gross Amount
 
 
 
 
Financial Instruments(2)
 
Collateral(3)
 
Net Amount
 
(Dollars in millions)
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OTC risk management derivatives
$
2,479

 
 
$
(2,464
)
 
 
 
$
15

 
 
 
$
—

 
 
$
—

 
$
15

Cleared risk management derivatives
1,811

 
 
(1,808
)
 
 
 
3

 
 
 
—

 
 
—

 
3

Mortgage commitment derivatives
132

 
 
—

 
 
 
132

 
 
 
(117
)
 
 
(1
)
 
14

Total derivative assets
4,422

 
 
(4,272
)
 
 
 
150

(4 
) 
 
 
(117
)
 
 
(1
)
 
32

Securities purchased under agreements to resell or similar arrangements(5)
44,670

 
 
—

 
 
 
44,670

 
 
 
—

 
 
(44,670
)
 
—

Total assets
$
49,092

 
 
$
(4,272
)
 
 
 
$
44,820

 
 
 
$
(117
)
 
 
$
(44,671
)
 
$
32

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OTC risk management derivatives
$
(3,045
)
 
$
2,957

 
 
 
$
(88
)
 
 
 
$
—

 
 
$
—

 
$
(88
)
Cleared risk management derivatives
(2,033
)
 
2,022

 
 
 
(11
)
 
 
 
—

 
 
11

 
—

Mortgage commitment derivatives
(228
)
 
—

 
 
 
(228
)
 
 
 
117

 
 
93

 
(18
)
Total derivative liabilities
(5,306
)
 
4,979

 
 
 
(327
)
(4 
) 
 
 
117

 
 
104

 
(106
)
Total liabilities
$
(5,306
)
 
$
4,979

 
 
 
$
(327
)
 
 
 
$
117

 
 
$
104

 
$
(106
)
 
As of December 31, 2016
 
 
 
 
Gross Amount Offset(1)
 
 
Net Amount Presented in our Consolidated Balance Sheets
 
Amounts Not Offset in our Consolidated Balance Sheets
 
 
 
Gross Amount
 
 
 
 
Financial Instruments(2)
 
Collateral(3)
 
Net Amount
 
(Dollars in millions)
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OTC risk management derivatives
$
3,688

 
 
$
(3,667
)
 
 
 
$
21

 
 
 
$
—

 
 
$
—

 
$
21

Cleared risk management derivatives
849

 
 
(847
)
 
 
 
2

 
 
 
—

 
 
—

 
2

Mortgage commitment derivatives
631

 
 
—

 
 
 
631

 
 
 
(357
)
 
 
(22
)
 
252

Total derivative assets
5,168

 
 
(4,514
)
 
 
 
654

(4 
) 
 
 
(357
)
 
 
(22
)
 
275

Securities purchased under agreements to resell or similar arrangements(5)
51,115

 
 
—

 
 
 
51,115

 
 
 
—

 
 
(51,115
)
 
—

Total assets
$
56,283

 
 
$
(4,514
)
 
 
 
$
51,769

 
 
 
$
(357
)
 
 
$
(51,137
)
 
$
275

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OTC risk management derivatives
$
(4,905
)
 
$
4,520

 
 
 
$
(385
)
 
 
 
$
—

 
 
$
—

 
$
(385
)
Cleared risk management derivatives
(2,415
)
 
2,324

 
 
 
(91
)
 
 
 
—

 
 
91

 
—

Mortgage commitment derivatives
(737
)
 
—

 
 
 
(737
)
 
 
 
357

 
 
16

 
(364
)
Total derivative liabilities
(8,057
)
 
6,844

 
 
 
(1,213
)
(4 
) 
 
 
357

 
 
107

 
(749
)
Total liabilities
$
(8,057
)
 
$
6,844

 
 
 
$
(1,213
)
 
 
 
$
357

 
 
$
107

 
$
(749
)
________
(1) 
Represents the effect of the 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 and accrued interest.
(2) 
Mortgage commitment derivative amounts reflect where we have recognized both an asset and a liability with the same counterparty under an enforceable master netting arrangement but we have not elected to offset the related amounts in our consolidated balance sheets.
(3) 
Represents collateral received that has not been recognized and not offset in our consolidated balance sheets as well as collateral posted which has been recognized but not offset in our consolidated balance sheets. Does not include collateral held or posted in excess of our exposure. The fair value of non-cash collateral we pledged was $747 million and $1.3 billion as of December 31, 2017 and December 31, 2016, respectively, which the counterparty was permitted to sell or repledge. The fair value of non-cash collateral received was $44.7 billion and $51.2 billion, of which $42.5 billion and $45.5 billion could be sold or repledged as of December 31, 2017 and December 31, 2016, respectively. None of the underlying collateral was sold or repledged as of December 31, 2017 and December 31, 2016.
(4) 
Excludes derivative assets of $21 million and $33 million as of December 31, 2017 and 2016, respectively, and derivative liabilities of $1 million and $2 million recognized in our consolidated balance sheets as of December 31, 2017 and 2016, respectively, that are not subject to enforceable master netting arrangements.
(5) 
Includes $25.2 billion and $20.7 billion of securities purchased under agreements to resell classified as “Cash and cash equivalents” in our consolidated balance sheets as of December 31, 2017 and 2016, respectively.