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Other Comprehensive Income
3 Months Ended
Mar. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other Comprehensive Income
Note 16Other Comprehensive Income
Components of other comprehensive income (loss) on a pre-tax and after-tax basis
($ in millions)Three months ended March 31,
20212020
Pre-taxTaxAfter-taxPre-taxTaxAfter-tax
Unrealized net holding gains and losses arising during the period, net of related offsets$(1,718)$364 $(1,354)$(1,433)$303 $(1,130)
Less: reclassification adjustment of realized capital gains and losses185 (39)146 287 (60)227 
Unrealized net capital gains and losses(1,903)403 (1,500)(1,720)363 (1,357)
Unrealized foreign currency translation adjustments43 (9)34 (49)10 (39)
Unamortized pension and other postretirement prior service credit (1)
(19)4 (15)6 (2)4 
Other comprehensive (loss) income$(1,879)$398 $(1,481)$(1,763)$371 $(1,392)
(1)    Represents prior service credits reclassified out of other comprehensive income and amortized into operating costs and expenses.