Equity (Tables)

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Schedule of Stockholders Equity [Table Text Block]

The following table presents changes in the number of shares issued and outstanding.

Year ended December 31, (in shares)	2014		2013	2012
Common stock
Total issued and outstanding, January 1,	479,767,470		412,600,700	412,600,700
New issuances
Employee benefits and compensation plans	368,569		—	—
Private placement (a)	—		67,166,770	—
Total issued, December 31,	480,136,039		479,767,470	412,600,700
Purchase of treasury stock	(41,148	)	—	—
Total outstanding, December 31,	480,094,891		479,767,470	412,600,700
Total treasury stock, December 31,	41,148		—	—

(a) On November 20, 2013, Ally completed its private placement of its common stock for an aggregate price of $1.3 billion.

Schedule of Stock by Class [Table Text Block]

The following table summarizes information about our Series A and Series G preferred stock.

December 31,	2014			2013
Series A preferred stock (a)
Carrying value ($ in millions)	$	1,021		$	1,021
Par value (per share)	0.01			0.01
Liquidation preference (per share)	25			25
Number of shares authorized	40,870,560			160,870,560
Number of shares issued and outstanding	40,870,560			40,870,560
Dividend/coupon
Prior to May 15, 2016	8.5		%	8.5		%
On and after May 15, 2016	three month LIBOR + 6.243%			three month LIBOR + 6.243%
Series G preferred stock (b) (c)
Carrying value ($ in millions)	$	234		$	234
Par value (per share)	0.01			0.01
Liquidation preference (per share)	1,000			1,000
Number of shares authorized	2,576,601			2,576,601
Number of shares issued and outstanding	2,576,601			2,576,601
Dividend/coupon	7		%	7		%

(a) Nonredeemable prior to May 15, 2016.

(b) Pursuant to a registration rights agreement, we are required to maintain an effective shelf registration statement. In the event we fail to meet this obligation, we may be required to pay additional interest to the holders of the Series G Preferred Stock.

(c) Redeemable.