Offsetting Assets and Liabilities Offsetting Assets and Liabilities (Assets) (Tables)

9 Months Ended

Sep. 30, 2016

Offsetting Assets and Liabilities [Abstract]

Offsetting Assets [Table Text Block]

The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows.

	Gross amounts of recognized assets/(liabilities)			Gross amounts offset in the Condensed Consolidated Balance Sheet		Net amounts of assets/(liabilities) presented in the Condensed Consolidated Balance Sheet
									Gross amounts not offset in the Condensed Consolidated Balance Sheet
September 30, 2016($ in millions)									Financial instruments			Collateral (a) (b) (c)			Net amount
Assets
Derivative assets in net asset positions	$	140		$	—	$	140		$	(15	)	$	(104	)	$	21
Derivative assets in net liability positions	1			—		1			(1		)	—			—
Total assets (d)	$	141		$	—	$	141		$	(16	)	$	(104	)	$	21
Liabilities
Derivative liabilities in net liability positions	$	(28	)	$	—	$	(28	)	$	—		$	7		$	(21	)
Derivative liabilities in net asset positions	(15		)	—		(15		)	15			—			—
Derivative liabilities with no offsetting arrangements	(3		)	—		(3		)	—			—			(3		)
Total derivative liabilities (d)	(46		)	—		(46		)	15			7			(24		)
Securities sold under agreements to repurchase (e)	(659		)	—		(659		)	—			659			—
Total liabilities	$	(705	)	$	—	$	(705	)	$	15		$	666		$	(24	)

(a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty.

(b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. $2 million of noncash derivative collateral pledged to us was excluded at September 30, 2016. We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met.

(c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $2 million at September 30, 2016. We have not sold or pledged any of the noncash collateral received under these agreements as of September 30, 2016.

(d) For additional information on derivative instruments and hedging activities, refer to Note 20.

(e) For additional information on securities sold under agreements to repurchase, refer to Note 13.

	Gross amounts of recognized assets/(liabilities)			Gross amounts offset in the Condensed Consolidated Balance Sheet		Net amounts of assets/(liabilities) presented in the Condensed Consolidated Balance Sheet
									Gross amounts not offset in the Condensed Consolidated Balance Sheet
December 31, 2015 ($ in millions)									Financial instruments			Collateral (a) (b) (c)			Net amount
Assets
Derivative assets in net asset positions	$	224		$	—	$	224		$	(69	)	$	(67	)	$	88
Derivative assets in net liability positions	9			—		9			(9		)	—			—
Total assets (d)	$	233		$	—	$	233		$	(78	)	$	(67	)	$	88
Liabilities
Derivative liabilities in net liability positions	$	(68	)	$	—	$	(68	)	$	9		$	2		$	(57	)
Derivative liabilities in net asset positions	(69		)	—		(69		)	69			—			—
Derivative liabilities with no offsetting arrangements	(8		)	—		(8		)	—			—			(8		)
Total derivative liabilities (d)	(145		)	—		(145		)	78			2			(65		)
Securities sold under agreements to repurchase (e)	(648		)	—		(648		)	—			648			—
Total liabilities	$	(793	)	$	—	$	(793	)	$	78		$	650		$	(65	)

(a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty.

(b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. $7 million of noncash derivative collateral pledged to us was excluded at December 31, 2015. We do not record such collateral received on our Consolidated Balance Sheet unless certain conditions are met.

(c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $7 million at December 31, 2015. We have not sold or pledged any of the noncash collateral received under these agreements as of December 31, 2015.

(d) For additional information on derivative instruments and hedging activities, refer to Note 20.

(e) For additional information on securities sold under agreements to repurchase, refer to Note 13.