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Components of Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2020
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Other Comprehensive Income (Loss) Components of Other Comprehensive Income (Loss)
The following table provides the changes in accumulated other comprehensive income (loss) by component, net of tax, for the years ended December 31, 2020, 2019, and 2018:
(Dollars in millions)Securities AFSCash Flow
Hedges		Pension and
Post-retirement
Plans		Total
Balance as of December 31, 2017$(22)$(6)$(237)$(265)
Adjustment to reflect adoption of ASU 2018-02(5)(2)(51)(58)
Balance as of December 31, 2017, as adjusted(27)(8)(288)(323)
Net unrealized gains (losses)(49)(6)(9)(64)
Amounts reclassified from AOCI— 2 9 11 
Other comprehensive income (loss)(49)(4)— (53)
Balance as of December 31, 2018(76)(12)(288)(376)
Net unrealized gains (losses)107 11 8 126 
Amounts reclassified from AOCI— 4 7 11 
Other comprehensive income (loss)107 15 15 137 
Balance as of December 31, 201931 3 (273)(239)
Net unrealized gains (losses)74 15 3 92 
Amounts reclassified from AOCI3 (6)10 7 
Other comprehensive income (loss)77 9 13 99 
Balance as of December 31, 2020$108 $12 $(260)$(140)

Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in millions) 
Details about AOCI202020192018Affected line item in the statement where net income is presented
Securities AFS:
Realized (gains) losses on securities AFS$4 $— $— Securities gains (losses), net
Tax expense (benefit)(1)— — Income tax expense
3 — — 
Cash flow hedges:
Realized (gains) losses on cash flow hedges(8)5 3 Interest and fees on loans and leases
Tax expense (benefit)2 (1)(1)Income tax expense
(6)4 2 
Pension and Postretirement Plans:
Amortization of prior service cost and net actuarial (gain) loss13 10 12 All other expense
Tax expense (benefit)(3)(3)(3)Income tax expense
10 7 9 
Total reclassification from AOCI$7 $11 $11