Investment Securities - (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Investment Securities [Table Text Block]



	December 31, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	770	$	5	$	13	$	762
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,830		1		13		1,818
Agency guaranteed mortgage-backed securities	9,798		9		141		9,666
Small Business Administration loan-backed securities	2,227		10		15		2,222
Municipal securities	1,336		9		11		1,334
Other debt securities	25		—		1		24
Total available-for-sale debt securities	15,241		29		181		15,089
Money market mutual funds and other	72		—		—		72
Total available-for-sale	15,313		29		181		15,161
Total investment securities	$	16,083	$	34	$	194	$	15,923



	December 31, 2016
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	868	$	5	$	23	$	850
Available-for-sale
U.S. Treasury securities	—		—		—		—
U.S. Government agencies and corporations:
Agency securities	1,846		2		9		1,839
Agency guaranteed mortgage-backed securities	7,986		7		110		7,883
Small Business Administration loan-backed securities	2,298		8		18		2,288
Municipal securities	1,182		1		29		1,154
Other debt securities	25		—		1		24
Total available-for-sale debt securities	13,337		18		167		13,188
Money market mutual funds and other	184		—		—		184
Total available-for-sale	13,521		18		167		13,372
Total investment securities	$	14,389	$	23	$	190	$	14,222

Investments Classified by Contractual Maturity Date [Table Text Block]



	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value

Due in one year or less	$	180	$	90	$	2,499	$	2,054
Due after one year through five years	372		336		5,727		5,575
Due after five years through ten years	159		230		4,331		4,485
Due after ten years	59		106		2,684		2,975
Total	$	770	$	762	$	15,241	$	15,089

Gain (Loss) on Investments [Table Text Block]

The following summarizes gains and losses, including OTTI, that were recognized in the statement of income:

	2017				2016				2015
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses
Investment securities:
Available-for-sale	$	—	$	—	$	—	$	—	$	9	$	148
Other noninterest-bearing investments	22		8		21		14		25		13
Total investments	22		8		21		14		34		161
Net gains (losses)			$	14			$	7			$	(127	)
Statement of income information:
Equity securities gains, net			$	14			$	7			$	12
Fixed income securities gains (losses), net			—				—				(139		)
Net gains (losses)			$	14			$	7			$	(127	)

Schedule of Unrealized Loss on Investments [Table Text Block]



	December 31, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	3	$	263	$	10	$	292	$	13	$	555
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	6		808		7		808		13		1,616
Agency guaranteed mortgage-backed securities	29		3,609		112		4,721		141		8,330
Small Business Administration loan-backed securities	3		408		12		649		15		1,057
Municipal securities	6		554		5		230		11		784
Other	—		—		1		14		1		14
Total available-for-sale	44		5,379		137		6,422		181		11,801
Total	$	47	$	5,642	$	147	$	6,714	$	194	$	12,356



	December 31, 2016
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	15	$	467	$	8	$	61	$	23	$	528
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	9		950		—		127		9		1,077
Agency guaranteed mortgage-backed securities	102		6,649		7		326		109		6,975
Small Business Administration loan-backed securities	3		527		16		841		19		1,368
Municipal securities	28		992		—		9		28		1,001
Other	—		—		2		14		2		14
Total available-for-sale	142		9,118		25		1,317		167		10,435
Total	$	157	$	9,585	$	33	$	1,378	$	190	$	10,963

Tax and Nontaxable Interest Income by Investment Type [Table Text Block]



(In millions)	2017						2016						2015
(In millions)	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	10	$	13	$	23	$	10	$	13	$	23	$	13	$	11	$	24
Available-for-sale	277		24		301		166		12		178		95		3		98
Trading	2		—		2		3		—		3		2		—		2
Total	$	289	$	37	$	326	$	179	$	25	$	204	$	110	$	14	$	124

- Definition

Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments.

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