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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Components of Other Comprehensive Income (Loss)
AOCI represents cumulative gains and losses that are not reflected in earnings. The components of other comprehensive income (loss) are as follows:
Year Ended December 31,202020192018
Before
Tax		Tax
Effect		Net of
Tax		Before
Tax		Tax
Effect		Net of
Tax		Before
Tax		Tax
Effect		Net of
Tax
Change in net unrealized gain (loss) on available for sale
securities:		        
Net unrealized gain (loss)$6,961 $(1,658)$5,303 $430 $(102)$328 $(123)$30 $(93)
Other reclassifications included in other revenue(4)1 (3)(6)1 (5)— — — 
Change in net unrealized gain (loss) on held to maturity
securities:
Amortization of amounts previously recorded upon transfer to
held to maturity from available for sale		— — — 36 (9)27 35 (8)27 
Other8 (2)6 (14)4 (10)(1)— (1)
Other comprehensive income (loss)$6,965 $(1,659)$5,306 $446 $(106)$340 $(89)$22 $(67)
Accumulated Other Comprehensive Income Balances
AOCI balances are as follows:
Total AOCI
Balance at December 31, 2017$(152)
Adoption of accounting standards (1)
(33)
Available for sale securities:
Net unrealized gain (loss) (93)
Held to maturity securities:
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale27 
Other(1)
Balance at December 31, 2018$(252)
Available for sale securities:
Net unrealized gain (loss), excluding transfers to available for sale from held to maturity309 
Net unrealized gain on securities transferred to available for sale from held to maturity (2)
19 
Other reclassifications included in other revenue(5)
Held to maturity securities:
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale27 
Other(10)
Balance at December 31, 2019$88 
Available for sale securities:
Net unrealized gain (loss), excluding transfers to available for sale from held to maturity4,246 
Net unrealized gain on securities transferred to available for sale from held to maturity (3)
1,057 
Other reclassifications included in other revenue(3)
Other6 
Balance at December 31, 2020$5,394 
(1) As part of the adoption of ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”, we elected to reclassify the income tax effects of the Tax Cuts and Jobs Act from items in AOCI into retained earnings as of January 1, 2018.
(2) In the first quarter of 2019, the Company made an election to transfer a portion of its HTM securities to AFS as part of the adoption of ASU 2017-12. The transfer resulted in a net of tax increase to AOCI of $19 million. See Note 6 for additional discussion on the 2019 transfer of HTM securities to AFS.
(3) On January 1, 2020, the Company transferred all of its investment securities designated as HTM to the AFS category. The transfer resulted in a net of tax increase to AOCI of $1.1 billion. See Note 6 for additional discussion on the 2020 transfer of HTM securities to AFS.