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Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Changes in Other Comprehensive income |  |
Balances as of start of period | $ (2,534) |
Pension and other postretirement benefit gains | 26 | $ 23
Balances as of end of period | (2,502) |
Accumulated Other Comprehensive Loss [Member] |  |
Changes in Other Comprehensive income |  |
Balances as of start of period | (2,534) | (1,919)
Net unrealized gains (losses) | 4 | 0
(Decrease) increase due to amounts reclassified into earnings | (2) | 0
Net translation loss of investments in foreign operations | 96 | (450)
Net losses gains related to hedges of investment in foreign operations | (92) | 195
Pension and other postretirement benefit gains | 26 | 23
Net change in accumulated other comprehensive income (loss) | 32 | (232)
Balances as of end of period | (2,502) | (2,151)
Net Unrealized Gains (Losses) on Investment Securities [Member] |  |
Changes in Other Comprehensive income |  |
Balances as of start of period | 58 | 96
Net unrealized gains (losses) | 4 | 0
(Decrease) increase due to amounts reclassified into earnings | (2) | 0
Net translation loss of investments in foreign operations | 0 | 0
Net losses gains related to hedges of investment in foreign operations | 0 | 0
Pension and other postretirement benefit gains | 0 | 0
Net change in accumulated other comprehensive income (loss) | 2 | 0
Balances as of end of period | 60 | 96
Foreign Currency Translation Adjustments [Member] |  |
Changes in Other Comprehensive income |  |
Balances as of start of period | (2,044) | (1,499)
Net unrealized gains (losses) | 0 | 0
(Decrease) increase due to amounts reclassified into earnings | 0 | 0
Net translation loss of investments in foreign operations | 96 | (450)
Net losses gains related to hedges of investment in foreign operations | (92) | 195
Pension and other postretirement benefit gains | 0 | 0
Net change in accumulated other comprehensive income (loss) | 4 | (255)
Balances as of end of period | (2,040) | (1,754)
Net Unrealized Pension and Other Postretirement Gains (Losses) [Member] |  |
Changes in Other Comprehensive income |  |
Balances as of start of period | (548) | (516)
Net unrealized gains (losses) | 0 | 0
(Decrease) increase due to amounts reclassified into earnings | 0 | 0
Net translation loss of investments in foreign operations | 0 | 0
Net losses gains related to hedges of investment in foreign operations | 0 | 0
Pension and other postretirement benefit gains | 26 | 23
Net change in accumulated other comprehensive income (loss) | 26 | 23
Balances as of end of period | $ (522) | $ (493)

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- Definition Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax. + 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://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=36458714&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=36458714&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=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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