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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investment [Table Text Block]
Our portfolio of securities includes bonds, equity securities, asset-backed securities, commercial and residential mortgage-backed securities, and other investments. The cost, fair value, and gross unrealized gains and losses on investment securities were as follows.
 
 
June 30, 2017
 
December 31, 2016


Amortized cost

Gross unrealized

Fair value

Amortized cost

Gross unrealized

Fair
value
($ in millions)

gains

losses

gains

losses

Available-for-sale securities
















Debt securities
















U.S. Treasury

$
1,891


$
—


$
(39
)

$
1,852


$
1,680


$
—


$
(60
)

$
1,620

U.S. States and political subdivisions

780


13


(11
)

782


794


7


(19
)

782

Foreign government

148


2


—


150


157


5


—


162

Agency mortgage-backed residential

13,809


39


(172
)

13,676


10,473


29


(212
)

10,290

Mortgage-backed residential
 
2,063

 
11

 
(36
)
 
2,038

 
2,162

 
5

 
(70
)
 
2,097

Mortgage-backed commercial

474


2


(1
)

475


537


2


(2
)

537

Asset-backed

1,010


6


(2
)

1,014


1,396


6


(2
)

1,400

Corporate debt

1,273


8


(9
)

1,272


1,452


7


(16
)

1,443

Total debt securities (a) (b)

21,448


81


(270
)

21,259


18,651


61


(381
)

18,331

Equity securities

549


9


(53
)

505


642


7


(54
)

595

Total available-for-sale securities

$
21,997


$
90


$
(323
)

$
21,764


$
19,293


$
68


$
(435
)

$
18,926

Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency mortgage-backed residential (c)
 
$
1,143

 
$
2

 
$
(35
)
 
$
1,110

 
$
839

 
$
—

 
$
(50
)
 
$
789

Asset-backed retained notes
 
46

 
—

 
—

 
46

 
—

 
—

 
—

 
—

Total held-to-maturity securities

$
1,189


$
2


$
(35
)

$
1,156


$
839

 
$
—

 
$
(50
)
 
$
789

(a)
Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $12 million and $14 million at June 30, 2017, and December 31, 2016, respectively.
(b)
Investment securities with a fair value of $3,316 million and $4,881 million at June 30, 2017, and December 31, 2016, respectively, were pledged to secure advances from the Federal Home Loan Bank (FHLB), short-term borrowings or repurchase agreements and for other purposes as required by contractual obligation or law. Under these agreements, Ally has granted the counterparty the right to sell or pledge $1,420 million and $737 million of the underlying investment securities at June 30, 2017, and December 31, 2016, respectively.
(c)
Agency mortgage-backed residential debt securities are held for liquidity purposes. Securities with a fair value of $0 million and $87 million at June 30, 2017, and December 31, 2016, respectively, were pledged to secure advances from the FHLB.
Investments Classified by Contractual Maturity Date [Table Text Block]
The maturity distribution of investment securities outstanding is summarized in the following tables. Call or prepayment options may cause actual maturities to differ from contractual maturities.


Total

Due in one year or less

Due after one year through five years

Due after five years through ten years

Due after ten years
($ in millions)

Amount

Yield

Amount

Yield

Amount

Yield

Amount

Yield

Amount

Yield
June 30, 2017




















Fair value of available-for-sale debt securities (a)




















U.S. Treasury

$
1,852


1.7
%

$
—


—
%

$
21


1.7
%

$
1,831


1.7
%

$
—


—
%
U.S. States and political subdivisions

782


3.1


38


2.5


45


2.4


165


2.8


534


3.3

Foreign government

150


2.5


—


—


68


2.6


82


2.4


—


—

Agency mortgage-backed residential
 
13,676

 
3.0

 
—

 
—

 
—

 
—

 
3

 
2.9

 
13,673

 
3.0

Mortgage-backed residential

2,038


2.9


—


—


—


—


—


—


2,038


2.9

Mortgage-backed commercial

475


3.1


—


—


—


—


3


2.9


472


3.1

Asset-backed

1,014


2.9


—


—


801


3.0


57


2.9


156


2.7

Corporate debt

1,272


2.9


125


2.3


617


2.6


496


3.2


34


5.2

Total available-for-sale debt securities

$
21,259


2.9


$
163


2.3


$
1,552


2.8


$
2,637


2.1


$
16,907


3.0

Amortized cost of available-for-sale debt securities

$
21,448




$
163




$
1,545




$
2,675




$
17,065



Amortized cost of held-to-maturity securities
 


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency mortgage-backed residential
 
$
1,143

 
3.0
%
 
$
—

 
—
%
 
$
—

 
—
%
 
$
—

 
—
%
 
$
1,143

 
3.0
%
Asset-backed retained notes
 
46

 
1.6

 
4

 
0.8

 
41

 
1.6

 
1

 
3.0

 
—

 
—

Total held-to-maturity securities
 
$
1,189

 
2.9

 
$
4

 
0.8

 
$
41

 
1.6

 
$
1

 
3.0

 
$
1,143

 
3.0

December 31, 2016




















Fair value of available-for-sale debt securities (a)




















U.S. Treasury

$
1,620


1.7
%

$
2


4.6
%

$
60


1.6
%

$
1,558


1.7
%

$
—


—
%
U.S. States and political subdivisions

782


3.1


64


1.7


29


2.3


172


2.8


517


3.4

Foreign government

162


2.6


—


—


58


2.8


104


2.4


—


—

Agency mortgage-backed residential
 
10,290

 
2.9

 
—

 
—

 
—

 
—

 
29

 
2.6

 
10,261

 
2.9

Mortgage-backed residential

2,097


2.9


—


—


—


—


—


—


2,097


2.9

Mortgage-backed commercial

537


2.6


—


—


—


—


3


2.8


534


2.6

Asset-backed

1,400


2.8


—


—


1,059


2.8


143


3.2


198


2.6

Corporate debt

1,443


2.8


72


2.2


840


2.6


489


3.2


42


4.7

Total available-for-sale debt securities

$
18,331


2.8


$
138


2.0


$
2,046


2.7


$
2,498


2.2


$
13,649


2.9

Amortized cost of available-for-sale debt securities

$
18,651





$
138





$
2,040





$
2,563





$
13,910




Amortized cost of held-to-maturity securities (b)

$
839


2.9
%

$
—


—
%

$
—


—
%

$
—


—
%

$
839


2.9
%
(a)
Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses
Investment Income [Table Text Block]
The following table presents interest and dividends on investment securities.
 
Three months ended June 30,
 
Six months ended June 30,
($ in millions)
2017
 
2016
 
2017
 
2016
Taxable interest
$
130


$
89

 
$
249

 
$
183

Taxable dividends
3


5

 
5

 
9

Interest and dividends exempt from U.S. federal income tax
6


5

 
11

 
9

Interest and dividends on investment securities
$
139


$
99

 
$
265

 
$
201
Schedule of Realized Gain (Loss) [Table Text Block]
The following table presents gross gains and losses realized upon the sales of available-for-sale securities. There were no other-than-temporary impairments upon the sales of available-for-sale securities for either period.
 
Three months ended June 30,
 
Six months ended June 30,
($ in millions)
2017
 
2016
 
2017
 
2016
Gross realized gains
$
24

 
$
40

 
$
51

 
$
94

Gross realized losses (a)
(1
)
 
(1
)
 
(1
)
 
(1
)
Other gain on investments, net
$
23

 
$
39

 
$
50

 
$
93

(a)
Certain available-for-sale securities were sold at a loss in 2017 and 2016 as a result of market conditions within these respective periods (e.g., a downgrade in the rating of a debt security). Any such sales were made in accordance with our risk management policies and practices.
Schedule of Unrealized Loss on Investments [Table Text Block]
The table below summarizes available-for-sale securities in an unrealized loss position in accumulated other comprehensive income. Based on the assessment of whether such losses were deemed to be other-than-temporary, we believe that the unrealized losses are not indicative of an other-than-temporary impairment of these securities. As of June 30, 2017, we did not have the intent to sell the debt securities with an unrealized loss position in accumulated other comprehensive income, it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis, and we expect to recover the entire amortized cost basis of the securities. As of June 30, 2017, we had the ability and intent to hold equity securities with an unrealized loss position in accumulated other comprehensive income, and it is not more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss position in accumulated other comprehensive income are not considered to be other-than-temporarily impaired at June 30, 2017. Refer to Note 1 to the Consolidated Financial Statements in our 2016 Annual Report on Form 10-K for additional information related to investment securities and our methodology for evaluating potential other-than-temporary impairments.
 
 
June 30, 2017
 
December 31, 2016


Less than 12 months

12 months or longer

Less than 12 months

12 months or longer
($ in millions)

Fair value

Unrealized loss

Fair value

Unrealized loss

Fair value

Unrealized loss

Fair value

Unrealized loss
Available-for-sale securities
















Debt securities
















U.S. Treasury

$
1,829


$
(39
)

$
—


$
—


$
1,612


$
(60
)

$
—


$
—

U.S. States and political subdivisions

401


(10
)

15


(1
)

524


(19
)

—


—

Foreign government

26


—


—


—


38


—


—


—

Agency mortgage-backed residential
 
9,293

 
(162
)
 
448

 
(10
)
 
8,052

 
(196
)
 
587

 
(16
)
Mortgage-backed residential

410


(6
)

763


(30
)

813


(17
)

860


(53
)
Mortgage-backed commercial
 
102

 
(1
)
 
49

 
—

 
47

 
(1
)
 
149

 
(1
)
Asset-backed

293


(1
)

107


(1
)

375


(2
)

127


—

Corporate debt

495


(7
)

36


(2
)

744


(14
)

46


(2
)
Total temporarily impaired debt securities

12,849


(226
)

1,418


(44
)

12,205


(309
)

1,769


(72
)
Temporarily impaired equity securities

140


(9
)

124


(44
)

151


(8
)

269


(46
)
Total temporarily impaired available-for-sale securities

$
12,989


$
(235
)

$
1,542


$
(88
)

$
12,356


$
(317
)

$
2,038


$
(118
)