Other Assets (Tables)

12 Months Ended

Dec. 31, 2014

The following is a summary of other assets as of December 31:

(Millions)	2014		2013
Goodwill	$	3,024	$	3,198
Deferred tax assets, net^(a)		2,110		2,443
Prepaid expenses^(b)		1,626		1,998
Other intangible assets, at amortized cost		854		817
Derivative assets^(a)		711		329
Restricted cash^(c)		384		486
Other		2,633		1,957
Total	$	11,342	$	11,228

Refer to Notes 21 and 14 for a discussion of deferred tax assets, net and derivative assets, respectively, as of December 31, 2014 and 2013. Derivative assets reflect the impact of master netting agreements. For 2014, $96 million of foreign deferred tax liabilities is reflected in Other Liabilities.
Includes prepaid miles and reward points acquired primarily from airline partners of approximately $1.1 billion and $1.5 billion as of December 31, 2014 and 2013, respectively, including approximately $0.6 billion and $0.9 billion, respectively, from Delta.
Includes restricted cash of approximately $64 million and $58 million as of December 31, 2014 and 2013, respectively, which is primarily held for coupon and certain asset-backed securitization maturities.

Changes in carrying amount of goodwill

The changes in the carrying amount of goodwill reported in the Company’s reportable operating segments and Corporate & Other were as follows:

									Corporate &
(Millions)	USCS		ICS		GCS		GNMS			Other	Total
Balance as of January 1, 2013	$	175	$	1,031	$	1,544	$	160	$	271	$	3,181
Acquisitions		―		―		―		―		―		―
Dispositions		―		―		―		―		―		―
Other, including foreign currency translation		(1)		21		(1)		―		(2)		17
Balance as of December 31, 2013	$	174	$	1,052	$	1,543	$	160	$	269	$	3,198
Acquisitions		―		―		―		―		―		―
Dispositions		―		―		(102)		―		―		(102)
Other, including foreign currency translation		―		(70)		―		―		(2)		(72)
Balance as of December 31, 2014	$	174	$	982	$	1,441	$	160	$	267	$	3,024

Components of other intangible assets

The components of other intangible assets were as follows:

		2014						2013
(Millions)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships^(a)	$	1,455	$	(754)	$	701	$	1,297	$	(660)	$	637
Other		255		(102)		153		269		(89)		180
Total	$	1,710	$	(856)	$	854	$	1,566	$	(749)	$	817

Includes net intangibles acquired from airline partners of $340 million and $290 million as of December 31, 2014 and 2013, respectively, including approximately $206 million and $117 million, respectively, from Delta.

Estimated amortization expense for other intangible assets

Estimated amortization expense for other intangible assets over the next five years is as follows:

(Millions)			2015			2016			2017			2018			2019
Estimated amortization expense		$	158		$	134		$	117		$	109		$	87