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Accumulated Other Comprehensive Loss
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss
ACCUMULATED OTHER COMPREHENSIVE LOSS
The following table presents a reconciliation of the changes in the components of accumulated other comprehensive loss and details the components of other comprehensive income (loss) for the nine months ended September 30, 2018 and 2017, including the amount of income tax expense (benefit) allocated to each component of other comprehensive income (loss).
 
Nine Months Ended September 30,
(in millions)
2018
 
2017
Accumulated net unrealized losses on investment securities:
 
 
 
Balance at beginning of period, net of tax
$
(101
)
 
$
(33
)
 
 
 
 
Cumulative effect of change in accounting principle
1

 
—

 
 
 
 
Net unrealized holding (losses) gains arising during the period
(254
)
 
18

Less: (Benefit) provision for income taxes
(59
)
 
7

Net unrealized holding (losses) gains arising during the period, net of tax
(195
)
 
11

Less:
 
 
 
Net realized losses included in net securities losses
(20
)
 
—

Less: Benefit for income taxes
(5
)
 
—

Reclassification adjustment for net securities losses included in net income, net of tax
(15
)
 
—

Less:
 
 
 
Net losses realized as a yield adjustment in interest on investment securities
—

 
(3
)
Less: Benefit for income taxes
—

 
(1
)
Reclassification adjustment for net losses realized as a yield adjustment included in net income, net of tax
—

 
(2
)
Change in net unrealized (losses) gains on investment securities, net of tax
(180
)
 
13

Balance at end of period, net of tax
$
(280
)
 
$
(20
)
 
 
 
 
Accumulated defined benefit pension and other postretirement plans adjustment:
 
 
 
Balance at beginning of period, net of tax
$
(350
)
 
$
(350
)
 
 
 
 
Amortization of actuarial net loss
45

 
38

Amortization of prior service credit
(20
)
 
(20
)
Amounts recognized in other noninterest expense
25

 
18

   Less: Provision for income taxes
6

 
7

Change in defined benefit pension and other postretirement plans adjustment, net of tax
19

 
11

Balance at end of period, net of tax
$
(331
)
 
$
(339
)
Total accumulated other comprehensive loss at end of period, net of tax
$
(611
)
 
$
(359
)