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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Statement of Comprehensive Income [Abstract] |  |
Unrealized losses on securities transferred to held to maturity during the period, tax | $ 0 | $ 0
Amortization of unrealized losses on securities transferred to held to maturity, tax | 0 | 0
Unrealized holding gains (losses) on available for sale securities, tax | (81) | 114
Reclassification adjustments for securities gains (losses) realized in net income, tax | (13) | 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax | (104) | 50
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax | (30) | (4)
Net actuarial gains and losses arising during the period, tax | 0 | 0
Reclassification adjustments for amortization of actuarial loss and settlements realized in net income, and other, tax | $ (2) | $ (2)

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- Definition Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 + Details
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- Definition Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 + Details
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