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Derivative and Hedging Activities - Cash Flow Hedges Components of AOCI Table (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, after tax, beginning of period |  |  |  | $ (57) |
Net change in fair value, after tax | [1] | $ 0 | $ 0 | 0 | $ 4
Losses reclassified to income, after tax | [1] | 8 | 8 | 25 | 25
AOCI, after tax, end of period |  | (32) |  | (32) |
Cash flow hedging [Member] |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, before tax, beginning of period |  | (97) | (132) | (114) | (153)
AOCI, after tax, beginning of period |  | (40) | (75) | (57) | (96)
Net change in fair value, before tax |  |  |  | 0 | 4
Net change in fair value, after tax |  |  |  | 0 | 4
Losses reclassified to income, before tax |  | 8 | 8 | 25 | 25
Losses reclassified to income, after tax |  | 8 | 8 | 25 | 25
AOCI, before tax, end of period |  | (89) | (124) | (89) | (124)
AOCI, after tax, end of period |  | $ (32) | $ (67) | $ (32) | $ (67)
[1] | Deferred tax activity incurred in other comprehensive income was offset by a valuation allowance.

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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