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Changes in Accumulated Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2015
Table Text Block [Abstract]  
Components of comprehensive income (loss), net of tax

Changes in each component for the three years ended December 31 were as follows:

(Millions), net of tax(a)Net Unrealized Gains (Losses) on Investment SecuritiesNet Unrealized Gains (Losses) on Cash Flow HedgesForeign Currency Translation AdjustmentsNet Unrealized Pension and Other Postretirement Benefit Losses (Gains)Accumulated Other Comprehensive (Loss) Income
Balances as of December 31, 2012  $315$―$(754)$(488)$(927)
Net unrealized losses  (159)―――(159)
Decrease due to amounts reclassified into earnings  (93)―――(93)
Net translation loss of investments in foreign operations  ――(589)―(589)
Net gains related to hedges of investments in foreign operations  ――253―253
Pension and other postretirement benefit gains  ―――8989
Net change in accumulated other comprehensive (loss) income   (252)―(336)89(499)
Balances as of December 31, 2013  63―(1,090)(399)(1,426)
Net unrealized gains   104―――104
Decrease due to amounts reclassified into earnings  (71)―5―(66)
Net translation loss of investments in foreign operations  ――(869)―(869)
Net gains related to hedges of investments in foreign operations  ――455―455
Pension and other postretirement benefit losses  ―――(117)(117)
Net change in accumulated other comprehensive income (loss)  33―(409)(117)(493)
Balances as of December 31, 2014  96 ― (1,499) (516) (1,919)
Net unrealized losses  (37)―――(37)
Decrease due to amounts reclassified into earnings  (1)―(1)―(2)
Net translation loss of investments in foreign operations  ――(1,122)―(1,122)
Net gains related to hedges of investment in foreign operations  ――578―578
Pension and other postretirement benefit losses  ―――(32)(32)
Net change in accumulated other comprehensive loss  (38)―(545)(32)(615)
Balances as of December 31, 2015  $58$―$(2,044)$(548)$(2,534)
Accumulated Other Comprehensive Loss Income Tax Effect Disclosure Text Block

The following table shows the tax impact for the three years ended December 31 for the changes in each component of Accumulated Other Comprehensive Income:

Tax expense (benefit)
(Millions)  201520142013
Investment securities  $(20)$19$(142)
Foreign currency translation adjustments  (124)(64)(49)
Net investment hedges340273135
Pension and other postretirement benefit losses  ―(46)56
Total tax impact  $196$182$―
Reclassification out of accumulated other comprehensive (loss) income

The following table presents the effects of reclassifications out of Accumulated Other Comprehensive (Loss) Income and into the Consolidated Statements of Income for the years ended December 31

Gains (losses) recognized in earnings
Description (Millions)Income Statement Line Item20152014
Available-for-sale securities
Reclassifications for previously unrealized net gains on
investment securitiesOther non-interest revenues$1$111
Related income tax expenseIncome tax provision―(40)
Reclassification to net income related to available-for-sale securities171
Foreign currency translation adjustments
Reclassification of realized losses on translation adjustments and related hedgesOther expenses 1(9)
Related income tax expenseIncome tax provision―4
Reclassification of foreign currency translation adjustments1(5)
Total$2$66