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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Net unrealized derivative instrument losses arising during the periods, tax | $ (11) | $ (9) | $ (38)
Reclassification adjustment for net derivative losses (gains) included in net income, tax | 10 | (9) | (22)
Net unrealized debt securities losses arising during the periods, tax | (79) | (4) | (82)
Other-than-temporary impairment not recognized in earnings on debt securities, tax | (1) | 0 | (10)
Reclassification of net debt securities gains to net income, tax | (4) | (2) | (2)
Actuarial (loss) gain, tax | (14) | 12 | (20)
Amortization of actuarial loss, tax | 3 | 5 | 6
Amortization of prior service credit, tax | $ 0 | $ 0 | $ 0

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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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