Fair Value (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis



	Fair Value Measurements on a Recurring Basis
	as of December 31, 2017
(In millions)	Quoted Market Prices in Active Markets (Level 1)		Pricing Methods with Significant Observable Market Inputs (Level 2)		Pricing Methods with Significant Unobservable Market Inputs (Level 3)		Impact of Netting⁽¹⁾			Total Net Carrying Value in Consolidated Statement of Condition
Assets:
Trading account assets:
U.S. government securities	$	39	$	—	$	—				$	39
Non-U.S. government securities	389		93		—					482
Other	44		528		—					572
Total trading account assets	472		621		—					1,093
AFS investment securities:
U.S. Treasury and federal agencies:
Direct obligations	11		212		—					223
Mortgage-backed securities	—		10,872		—					10,872
Total U.S. Treasury and federal agencies	11		11,084		—					11,095
Asset-backed securities:
Student loans	—		3,358		—					3,358
Credit cards	—		1,542		—					1,542
Other⁽²⁾	—		89		1,358					1,447
Total asset-backed securities	—		4,989		1,358					6,347
Non-U.S. debt securities:
Mortgage-backed securities	—		6,576		119					6,695
Asset-backed securities	—		2,545		402					2,947
Government securities	—		10,721		—					10,721
Other⁽³⁾	—		5,904		204					6,108
Total non-U.S. debt securities	—		25,746		725					26,471
State and political subdivisions	—		9,108		43					9,151
Collateralized mortgage obligations	—		1,054		—					1,054
Other U.S. debt securities	—		2,560		—					2,560
U.S. equity securities	—		46		—					46
U.S. money-market mutual funds	—		397		—					397
Total AFS investment securities	11		54,984		2,126					57,121
Other assets:
Derivative instruments:
Foreign exchange contracts	—		11,596		1		$	(7,593	)	4,004
Interest-rate contracts	8		—		—		—			8
Other derivative contracts	1		—		—		—			1
Total derivative instruments	9		11,596		1		(7,593		)	4,013
Total assets carried at fair value	$	492	$	67,201	$	2,127	$	(7,593	)	$	62,227
Liabilities:
Accrued expenses and other liabilities:
Trading account liabilities:
Other	$	39	$	—	$	—	$	—		$	39
Derivative instruments:
Foreign exchange contracts	—		11,467		1		(5,970		)	5,498
Interest-rate contracts	—		100		—		—			100
Other derivative contracts	1		283		—		—			284
Total derivative instruments	1		11,850		1		(5,970		)	5,882
Total liabilities carried at fair value	$	40	$	11,850	$	1	$	(5,970	)	$	5,921

⁽¹⁾Represents counterparty netting against level 2 financial assets and liabilities where a legally enforceable master netting agreement exists between State Street and the counterparty. Netting also reflects asset and liability reductions of $2,045 million and $422 million, respectively, for cash collateral received from and provided to derivative counterparties.

⁽²⁾As of December 31, 2017, the fair value of other ABS was primarily composed of $1,447 million of CLOs.

⁽³⁾As of December 31, 2017, the fair value of other non-U.S. debt securities was primarily composed of $3,537 million of covered bonds and $1,885 million of corporate bonds.



	Fair Value Measurements on a Recurring Basis
	as of December 31, 2016
(In millions)	Quoted Market Prices in Active Markets (Level 1)		Pricing Methods with Significant Observable Market Inputs (Level 2)		Pricing Methods with Significant Unobservable Market Inputs (Level 3)		Impact of Netting⁽¹⁾			Total Net Carrying Value in Consolidated Statement of Condition
Assets:
Trading account assets:
U.S. government securities	$	30	$	—	$	—				$	30
Non-U.S. government securities	495		174		—					669
Other	—		325		—					325
Total trading account assets	525		499		—					1,024
AFS investment securities:
U.S. Treasury and federal agencies:
Direct obligations	3,824		439		—					4,263
Mortgage-backed securities	—		13,257		—					13,257
Total U.S. Treasury and federal agencies	3,824		13,696		—					17,520
Asset-backed securities:
Student loans	—		5,499		97					5,596
Credit cards	—		1,351		—					1,351
Sub-prime	—		272		—					272
Other⁽²⁾	—		—		905					905
Total asset-backed securities	—		7,122		1,002					8,124
Non-U.S. debt securities:
Mortgage-backed securities	—		6,535		—					6,535
Asset-backed securities	—		2,484		32					2,516
Government securities	—		5,836		—					5,836
Other⁽³⁾	—		5,365		248					5,613
Total non-U.S. debt securities	—		20,220		280					20,500
State and political subdivisions	—		10,283		39					10,322
Collateralized mortgage obligations	—		2,577		16					2,593
Other U.S. debt securities	—		2,469		—					2,469
U.S. equity securities	—		42		—					42
Non-U.S. equity securities	—		3		—					3
U.S. money-market mutual funds	—		409		—					409
Non-U.S. money-market mutual funds	—		16		—					16
Total AFS investment securities	3,824		56,837		1,337					61,998
Other assets:
Derivatives instruments:
Foreign exchange contracts	—		16,476		8		$	(9,163	)	7,321
Interest-rate contracts	—		68		—		(68		)	—
Total derivative instruments	—		16,544		8		(9,231		)	7,321
Total assets carried at fair value	$	4,349	$	73,880	$	1,345	$	(9,231	)	$	70,343
Liabilities:
Accrued expenses and other liabilities:
Derivative instruments:
Foreign exchange contracts	$	—	$	15,948	$	8	$	(10,456	)	$	5,500
Interest-rate contracts	—		348		—		(226		)	122
Other derivative contracts	—		380		—		—			380
Total derivative instruments	—		16,676		8		(10,682		)	6,002
Total liabilities carried at fair value	$	—	$	16,676	$	8	$	(10,682	)	$	6,002

⁽¹⁾Represents counterparty netting against level 2 financial assets and liabilities where a legally enforceable master netting agreement exists between State Street and the counterparty. Netting also reflects asset and liability reductions of $906 million and $2,356 million, respectively, for cash collateral received from and provided to derivative counterparties.

⁽²⁾As of December 31, 2016, the fair value of other ABS was primarily composed of $905 million of CLOs.

⁽³⁾As of December 31, 2016, the fair value of other non-U.S. debt securities was primarily composed of $3,769 million of covered bonds and $988 million of corporate bonds.

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following tables present activity related to our level 3 financial assets during the years ended December 31, 2017 and 2016, respectively. Transfers into and out of level 3 are reported as of the beginning of the period presented. During the year ended December 31, 2017, transfers into level 3 were mainly related to certain ABS and MBS, including non-U.S. debt securities, and municipal loans for which fair value was measured using information obtained from third-party sources, including non-binding broker or dealer quotes. During the years ended December 31, 2017 and 2016, transfers out of level 3 were mainly related to certain MBS and ABS, including non-U.S. debt securities, for which fair value was measured using prices for which observable market information became available.



	Fair Value Measurements Using Significant Unobservable Inputs
	Year Ended December 31, 2017
	Fair Value as of December 31, 2016		Total Realized and Unrealized Gains (Losses)						Purchases		Sales			Settlements			Transfers into Level 3		Transfers out of Level 3			Fair Value as of December 31, 2017⁽¹⁾		Change in Unrealized Gains (Losses) Related to Financial Instruments Held as of December 31, 2017
(In millions)			Recorded in Revenue⁽¹⁾			Recorded in Other Comprehensive Income⁽¹⁾
Assets:
AFS Investment securities:
U.S. Treasury and federal agencies:
Mortgage-backed securities	$	—	$	—		$	—		$	—	$	—		$	—		$	25	$	(25	)	$	—
Asset-backed securities:
Student loans	97		—			1			200		—			—			—		(298		)	—
Other	905		3			—			1,035		(240		)	(620		)	275		—			1,358
Total asset-backed securities	1,002		3			1			1,235		(240		)	(620		)	275		(298		)	1,358
Non-U.S. debt securities:
Mortgage-backed securities	—		—			(2		)	119		—			2			—		—			119
Asset-backed securities	32		1			—			370		(10		)	(11		)	67		(47		)	402
Other	248		—			1			5		(81		)	31			—		—			204
Total non-U.S. debt securities	280		1			(1		)	494		(91		)	22			67		(47		)	725
State and political subdivisions	39		—			2			—		—			(3		)	5		—			43
Collateralized mortgage obligations	16		—			(1		)	24		—			—			—		(39		)	—
Other U.S. debt securities	—		—			—			19		(19		)	—			—		—			—
Total AFS investment securities	1,337		4			1			1,772		(350		)	(601		)	372		(409		)	2,126
Other assets:
Derivative instruments:
Foreign exchange contracts	8		(7		)	—			4		—			(4		)	—		—			1		$	(3	)
Total derivative instruments	8		(7		)	—			4		—			(4		)	—		—			1		(3		)
Total assets carried at fair value	$	1,345	$	(3	)	$	1		$	1,776	$	(350	)	$	(605	)	$	372	$	(409	)	$	2,127	$	(3	)

⁽¹⁾Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within trading services.



	Fair Value Measurements Using Significant Unobservable Inputs
	Year Ended December 31, 2016
	Fair Value as of December 31, 2015		Total Realized and Unrealized Gains (Losses)					Purchases		Sales			Settlements			Transfers out of Level 3			Fair Value as of December 31, 2016⁽²⁾		Change in Unrealized Gains (Losses) Related to Financial Instruments Held as of December 31, 2016
(In millions)			Recorded in Revenue⁽¹⁾		Recorded in Other Comprehensive Income⁽¹⁾
Assets:
AFS Investment securities:
U.S. Treasury and federal agencies, mortgage-backed securities	$	—	$	—	$	—		$	325	$	—		$	—		$	(325	)	$	—
Asset-backed securities:
Student loans	189		1		3			—		$	—		—			(96		)	97
Other	1,764		31		(23		)	469		(82		)	(1,254		)	—			905
Total asset-backed securities	1,953		32		(20		)	469		(82		)	(1,254		)	(96		)	1,002
Non-U.S. debt securities:
Mortgage-backed securities	—		—		—			90		—			—			(90		)	—
Asset-backed securities	174		—		—			196		—			(60		)	(278		)	32
Other	255		—		—			222		—			(7		)	(222		)	248
Total non-U.S. debt securities	429		—		—			508		—			(67		)	(590		)	280
State and political subdivisions	33		—		9			—		—			(3		)	—			39
Collateralized mortgage obligations	39		—		2			89		(66		)	(27		)	(21		)	16
Other U.S. debt securities	10		—		—			—		—			(10		)	—			—
Total AFS investment securities	2,464		32		(9		)	1,391		(148		)	(1,361		)	(1,032		)	1,337
Other assets:
Derivative instruments:
Foreign exchange contracts	5		9		—			3		—			(9		)	—			8		$	5
Total derivative instruments	5		9		—			3		—			(9		)	—			8		5
Total assets carried at fair value	$	2,469	$	41	$	(9	)	$	1,394	$	(148	)	$	(1,370	)	$	(1,032	)	$	1,345	$	5

⁽¹⁾ Total realized and unrealized gains (losses) on AFS investment securities are included within gains (losses) related to investment securities, net. Total realized and unrealized gains (losses) on derivative instruments are included within trading services.

⁽²⁾There were no transfers of assets into level 3 during the year ended December 31, 2016.

Fair Value Inputs, Assets, Quantitative Information

The following table presents quantitative information, as of the dates indicated, about the valuation techniques and significant unobservable inputs used in the valuation of our level 3 financial assets and liabilities measured at fair value on a recurring basis for which we use internally-developed pricing models. The significant unobservable inputs for our level 3 financial assets and liabilities whose fair value is measured using pricing information from non-binding broker or dealer quotes are not included in the table, as the specific inputs applied are not provided by the broker/dealer.



	Quantitative Information about Level 3 Fair Value Measurements
	Fair Value						Weighted-Average
(Dollars in millions)	As of December 31, 2017		As of December 31, 2016		Valuation Technique	Significant Unobservable Input⁽¹⁾	As of December 31, 2017		As of December 31, 2016
Significant unobservable inputs readily available to State Street:
Assets:
Asset-backed securities, other	$	—	$	1	Discounted cash flows	Credit spread	—	%	0.3	%
State and political subdivisions	—		39		Discounted cash flows	Credit spread	—		1.8
Derivative instruments, foreign exchange contracts	1		8		Option model	Volatility	7.2		14.4
Total	$	1	$	48
Liabilities:
Derivative instruments, foreign exchange contracts	$	1	$	8	Option model	Volatility	7.2		14.4
Total	$	1	$	8

⁽¹⁾Significant changes in these unobservable inputs would result in significant changes in fair value measurement.

Fair Value Inputs, Liabilities, Quantitative Information



	Quantitative Information about Level 3 Fair Value Measurements
	Fair Value						Weighted-Average
(Dollars in millions)	As of December 31, 2017		As of December 31, 2016		Valuation Technique	Significant Unobservable Input⁽¹⁾	As of December 31, 2017		As of December 31, 2016
Significant unobservable inputs readily available to State Street:
Assets:
Asset-backed securities, other	$	—	$	1	Discounted cash flows	Credit spread	—	%	0.3	%
State and political subdivisions	—		39		Discounted cash flows	Credit spread	—		1.8
Derivative instruments, foreign exchange contracts	1		8		Option model	Volatility	7.2		14.4
Total	$	1	$	48
Liabilities:
Derivative instruments, foreign exchange contracts	$	1	$	8	Option model	Volatility	7.2		14.4
Total	$	1	$	8

⁽¹⁾Significant changes in these unobservable inputs would result in significant changes in fair value measurement.

Carrying Value and Estimated Fair Value of Financial Instruments by Fair Value Hierarchy

The following tables present the reported amounts and estimated fair values of the financial assets and liabilities not carried at fair value on a recurring basis, as they would be categorized within the fair value hierarchy, as of the dates indicated.



					Fair Value Hierarchy
(In millions)	Reported Amount		Estimated Fair Value		Quoted Market Prices in Active Markets (Level 1)		Pricing Methods with Significant Observable Market Inputs (Level 2)		Pricing Methods with Significant Unobservable Market Inputs (Level 3)
December 31, 2017
Financial Assets:
Cash and due from banks	$	2,107	$	2,107	$	2,107	$	—	$	—
Interest-bearing deposits with banks	67,227		67,227		—		67,227		—
Securities purchased under resale agreements	3,241		3,241		—		3,241		—
Investment securities held-to-maturity	40,458		40,255		16,814		23,318		123
Net loans (excluding leases)⁽¹⁾	22,577		22,482		—		22,431		51
Financial Liabilities:
Deposits:
Non-interest-bearing	$	47,175	$	47,175	$	—	$	47,175	$	—
Interest-bearing - U.S.	50,139		50,139		—		50,139		—
Interest-bearing - non-U.S.	87,582		87,582		—		87,582		—
Securities sold under repurchase agreements	2,842		2,842		—		2,842		—
Other short-term borrowings	1,144		1,144		—		1,144		—
Long-term debt	11,620		11,919		—		11,639		280

⁽¹⁾ Includes $3 million of loans classified as held-for-sale that were measured at fair value on a non-recurring basis as of December 31, 2017.



					Fair Value Hierarchy
(In millions)	Reported Amount		Estimated Fair Value		Quoted Market Prices in Active Markets (Level 1)		Pricing Methods with Significant Observable Market Inputs (Level 2)		Pricing Methods with Significant Unobservable Market Inputs (Level 3)
December 31, 2016
Financial Assets:
Cash and due from banks	$	1,314	$	1,314	$	1,314	$	—	$	—
Interest-bearing deposits with banks	70,935		70,935		—		70,935		—
Securities purchased under resale agreements	1,956		1,956		—		1,956		—
Investment securities held-to-maturity	35,169		34,994		17,400		17,439		155
Net loans (excluding leases)	18,862		18,877		—		18,781		96
Financial Liabilities:
Deposits:
Non-interest-bearing	$	59,397	$	59,397	$	—	$	59,397	$	—
Interest-bearing - U.S.	30,911		30,911		—		30,911		—
Interest-bearing - non-U.S.	96,855		96,855		—		96,855		—
Securities sold under repurchase agreements	4,400		4,400		—		4,400		—
Other short-term borrowings	1,585		1,585		—		1,585		—
Long-term debt	11,430		11,618		—		11,282		336