Investment Securities (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary Of Investment Securities

A summary of the Corporation’s investment securities follows:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
March 31, 2019
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	2,742	$	19	$	5	$	2,756
Residential mortgage-backed securities (a)	9,533		36		113		9,456
Total investment securities available-for-sale	$	12,275	$	55	$	118	$	12,212
December 31, 2018
Investment securities available-for-sale:
U.S. Treasury and other U.S. government agency securities	$	2,732	$	14	$	19	$	2,727
Residential mortgage-backed securities (a)	9,493		22		197		9,318
Total investment securities available-for-sale	$	12,225	$	36	$	216	$	12,045

(a) Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

Summary Of Investment Securities In Unrealized Loss Positions

A summary of the Corporation’s investment securities in an unrealized loss position as of March 31, 2019 and December 31, 2018 follows:

	Temporarily Impaired
	Less than 12 Months				12 Months or more				Total
(in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
March 31, 2019
U.S. Treasury and other U.S. government agency securities	$	1,100	$	3	$	378	$	2	$	1,478	$	5
Residential mortgage-backed securities (a)	368		—		6,379		113		6,747		113
Total temporarily impaired securities	$	1,468	$	3	$	6,757	$	115	$	8,225	$	118
December 31, 2018
U.S. Treasury and other U.S. government agency securities	$	—	$	—	$	1,457	$	19	$	1,457	$	19
Residential mortgage-backed securities (a)	1,008		9		6,412		188		7,420		197
Total temporarily impaired securities	$	1,008	$	9	$	7,869	$	207	$	8,877	$	216

(a) Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

Summary of Net Securities Gains (Losses)

Sales, calls and write-downs of investment securities available-for-sale resulted in the following gains and losses recorded in net securities (losses) gains on the Consolidated Statements of Comprehensive Income, computed based on the adjusted cost of the specific security.

	Three Months Ended March 31,
(in millions)	2019			2018
Securities gains	$	—		$	1
Securities losses	(8		)	—
Net securities (losses) gains	$	(8	)	$	1

Contractual Maturity Distribution Of Debt Securities

The following table summarizes the amortized cost and fair values of debt securities by contractual maturity. Securities with multiple maturity dates are classified in the period of final maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in millions)
March 31, 2019	Amortized Cost		Fair Value
Contractual maturity
After one year through five years	$	2,784	$	2,797
After five years through ten years	1,396		1,390
After ten years	8,095		8,025
Total investment securities	$	12,275	$	12,212