Securities (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Trading Securities and Other Trading Assets [Line Items]

Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

The following tables provide the amortized cost and fair values of debt securities at June 30, 2018 and December 31, 2017.

Table 38: Reconciliation of Amortized Cost to Fair Value of Debt Securities Available for Sale

Debt Securities Available for Sale	June 30, 2018
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	5,668.7	$	26.0	$	56.2	$	5,638.5
Obligations of States and Political Subdivisions	741.3		0.1		3.6		737.8
Government Sponsored Agency	21,186.9		35.4		167.8		21,054.5
Non-U.S. Government	143.2		—		2.0		141.2
Corporate Debt	2,493.1		2.6		29.5		2,466.2
Covered Bonds	838.0		0.9		7.0		831.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,008.7		6.2		5.9		2,009.0
Other Asset-Backed	1,871.7		0.7		16.6		1,855.8
Auction Rate	2.9		—		0.1		2.8
Commercial Mortgage-Backed	433.9		—		6.2		427.7
Other	19.1		—		—		19.1
Total	$	35,407.5	$	71.9	$	294.9	$	35,184.5

Debt Securities Available for Sale	December 31, 2017
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	5,714.4	$	18.0	$	32.1	$	5,700.3
Obligations of States and Political Subdivisions	749.9		—		3.5		746.4
Government Sponsored Agency	18,745.3		39.9		108.6		18,676.6
Non-U.S. Government	179.1		—		1.9		177.2
Corporate Debt	3,013.7		2.2		22.9		2,993.0
Covered Bonds	879.0		1.0		4.4		875.6
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,819.8		4.0		3.8		1,820.0
Other Asset-Backed	2,297.7		1.5		7.9		2,291.3
Auction Rate	4.4		—		0.1		4.3
Commercial Mortgage-Backed	439.2		—		4.1		435.1
Other	22.3		—		—		22.3
Total	$	33,864.8	$	66.6	$	189.3	$	33,742.1

Reconciliation of Amortized Cost to Fair Values of Securities Held to Maturity

Table 39: Reconciliation of Amortized Cost to Fair Value of Debt Securities Held to Maturity

Debt Securities Held to Maturity	June 30, 2018
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S Government	$	115.7	$	—	$	—	$	115.7
Obligations of States and Political Subdivisions	32.6		1.1		—		33.7
Government Sponsored Agency	5.1		0.3		—		5.4
Corporate Debt	413.3		0.7		0.6		413.4
Covered Bonds	3,228.7		12.5		9.6		3,231.6
Non-U.S. Government	5,781.5		1.5		10.3		5,772.7
Certificates of Deposit	52.0		—		—		52.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,267.7		4.9		14.1		3,258.5
Other Asset-Backed	1,137.3		0.3		0.2		1,137.4
Other	191.2		—		53.8		137.4
Total	$	14,225.1	$	21.3	$	88.6	$	14,157.8

Debt Securities Held to Maturity	December 31, 2017
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S Government	$	35.0	$	—	$	—	$	35.0
Obligations of States and Political Subdivisions	34.6		1.4		0.1		35.9
Government Sponsored Agency	5.8		0.4		—		6.2
Corporate Debt	431.5		1.0		0.4		432.1
Covered Bonds	2,821.5		11.9		3.7		2,829.7
Non-U.S. Government	5,536.2		1.3		6.0		5,531.5
Certificates of Deposit	43.8		—		0.1		43.7
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,788.9		5.4		4.1		2,790.2
Other Asset-Backed	1,175.8		0.6		0.5		1,175.9
Other	175.9		—		45.2		130.7
Total	$	13,049.0	$	22.0	$	60.1	$	13,010.9

Debt Securities with Unrealized Losses

The following tables provide information regarding debt securities that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of June 30, 2018 and December 31, 2017.

Table 41: Debt Securities with Unrealized Losses

Debt Securities with Unrealized Losses as of June 30, 2018	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Government	$	3,374.3	$	55.5	$	199.2	$	0.7	$	3,573.5	$	56.2
Obligations of States and Political Subdivisions	678.0		3.5		7.6		0.1		685.6		3.6
Government Sponsored Agency	11,209.7		125.5		2,890.3		42.3		14,100.0		167.8
Non-U.S. Government	5,285.9		12.3		—		—		5,285.9		12.3
Corporate Debt	1,443.7		14.6		458.4		15.5		1,902.1		30.1
Covered Bonds	1,311.0		13.0		171.4		3.6		1,482.4		16.6
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,478.2		19.0		175.2		1.0		2,653.4		20.0
Other Asset-Backed	1,794.6		16.8		—		—		1,794.6		16.8
Auction Rate	1.1		0.1		—		—		1.1		0.1
Commercial Mortgage-Backed	228.3		4.2		181.8		2.0		410.1		6.2
Other	93.9		32.3		45.6		21.5		139.5		53.8
Total	$	27,898.7	$	296.8	$	4,129.5	$	86.7	$	32,028.2	$	383.5

Debt Securities with Unrealized Losses as of December 31, 2017	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. Government	$	3,595.0	$	32.1	$	—	$	—	$	3,595.0	$	32.1
Obligations of States and Political Subdivisions	687.8		3.3		52.0		0.3		739.8		3.6
Government Sponsored Agency	6,495.6		81.3		2,998.9		27.3		9,494.5		108.6
Non-U.S. Government	5,181.8		7.9		—		—		5,181.8		7.9
Corporate Debt	1,547.3		9.3		922.3		14.0		2,469.6		23.3
Covered Bonds	967.5		7.2		89.1		0.9		1,056.6		8.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,692.4		7.5		235.8		0.4		1,928.2		7.9
Other Asset-Backed	2,453.7		8.3		29.9		0.1		2,483.6		8.4
Certificates of Deposit	43.7		0.1		—		—		43.7		0.1
Auction Rate	—		—		3.1		0.1		3.1		0.1
Commercial Mortgage-Backed	233.5		2.6		201.6		1.5		435.1		4.1
Other	82.9		27.3		48.1		17.9		131.0		45.2
Total	$	22,981.2	$	186.9	$	4,580.8	$	62.5	$	27,562.0	$	249.4

Cumulative Credit-Related Losses on Debt Securities

The table below provides the cumulative credit-related losses recognized in earnings on debt securities other-than-temporarily impaired.

Table 42: Cumulative Credit-Related Losses on Debt Securities

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2018		2017		2018		2017
Cumulative Credit-Related Losses on Debt Securities Held — Beginning of Period	$	3.8	$	3.5	$	3.6	$	3.4
Plus: Losses on Newly Identified Impairments	—		—		0.2		—
Additional Losses on Previously Identified Impairments	—		—		—		0.1
Less: Current and Prior Period Losses on Debt Securities Sold During the Period	—		—		—		—
Cumulative Credit-Related Losses on Debt Securities Held — End of Period	$	3.8	$	3.5	$	3.8	$	3.5

Available for Sale Debt Securities

Schedule of Trading Securities and Other Trading Assets [Line Items]

Remaining Maturity of Securities Available for Sale and Held to Maturity

The following table provides the remaining maturity of debt securities as of June 30, 2018.

Table 40: Remaining Maturity of Debt Securities Available for Sale and Held to Maturity

	June 30, 2018
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,994.0	$	7,946.6
Due After One Year Through Five Years	20,901.5		20,758.0
Due After Five Years Through Ten Years	5,534.4		5,512.9
Due After Ten Years	977.6		967.0
Total	35,407.5		35,184.5
Held to Maturity
Due in One Year or Less	6,545.1		6,547.4
Due After One Year Through Five Years	7,225.5		7,200.2
Due After Five Years Through Ten Years	378.3		370.4
Due After Ten Years	76.2		39.8
Total	$	14,225.1	$	14,157.8

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.