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SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | $ 3,401 | $ 5,432 | $ 2,630 | $ 625
Other comprehensive income loss before reclassifications net of tax | [1] | 159 | (90) | 914 | 4,757
Amounts reclassified from accumulated other comprehensive income net of tax | [1] | (29) | 22 | (13) | (18)
Other comprehensive income (loss), net of tax | [1] | 130 | (68) | 901 | 4,739
Balance, end of period | [1] | 3,531 | 5,364 | 3,531 | 5,364
Unrealized foreign currency translation gains (losses) |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | (1,580) | (847) | (1,983) | (2,196)
Other comprehensive income loss before reclassifications net of tax | [1] | (135) | 253 | 268 | 1,602
Amounts reclassified from accumulated other comprehensive income net of tax | [1] | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | [1] | (135) | 253 | 268 | 1,602
Balance, end of period | [1] | (1,715) | (594) | (1,715) | (594)
Unrealized gains (losses) on investment securities |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | 5,173 | 6,441 | 4,805 | 2,986
Other comprehensive income loss before reclassifications net of tax | [1] | 296 | (342) | 653 | 3,155
Amounts reclassified from accumulated other comprehensive income net of tax | [1] | (32) | 21 | (21) | (21)
Other comprehensive income (loss), net of tax | [1] | 264 | (321) | 632 | 3,134
Balance, end of period | [1] | 5,437 | 6,120 | 5,437 | 6,120
Unrealized gains (losses) on derivatives |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | (23) | (19) | (24) | (26)
Other comprehensive income loss before reclassifications net of tax | [1] | 0 | 0 | 1 | 7
Amounts reclassified from accumulated other comprehensive income net of tax | [1] | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | [1] | 0 | 0 | 1 | 7
Balance, end of period | [1] | (23) | (19) | (23) | (19)
Pension liability adjustment |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | (169) | (143) | (168) | (139)
Other comprehensive income loss before reclassifications net of tax | [1] | (2) | (1) | (8) | (7)
Amounts reclassified from accumulated other comprehensive income net of tax | [1] | 3 | 1 | 8 | 3
Other comprehensive income (loss), net of tax | [1] | 1 | 0 | 0 | (4)
Balance, end of period | [1] | $ (168) | $ (143) | $ (168) | $ (143)
[1] | All amounts in the table above are net of tax.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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