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Changes in Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period |  |  | $ (927) |
Net unrealized pension and other postretirement benefit gains, net of tax | 27 | 14 | 54 | 20
Balances as of end of period | (1,308) |  | (1,308) |
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (980) | (777) | (927) | (876)
Net unrealized gains (losses) | (104) | 31 | (116) | 65
Reclassification for realized (gains) losses into earnings | (23) | (20) | (46) | (33)
Net translation of investments in foreign operations | (567) | (475) | (556) | (153)
Net gains (losses) related to hedges of investment in foreign operations | 339 | 276 | 283 | 26
Net unrealized pension and other postretirement benefit gains, net of tax | 27 | 14 | 54 | 20
Net change in accumulated other comprehensive (loss) income | (328) | (174) | (381) | (75)
Balances as of end of period | (1,308) | (951) | (1,308) | (951)
Net Unrealized Investment Gains (Losses) on Investment Securities [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | 280 | 308 | 315 | 288
Net unrealized gains (losses) | (104) | 31 | (116) | 65
Reclassification for realized (gains) losses into earnings | (23) | (20) | (46) | (34)
Net change in accumulated other comprehensive (loss) income | (127) | 11 | (162) | 31
Balances as of end of period | 153 | 319 | 153 | 319
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | 0 | 0 | 0 | (1)
Reclassification for realized (gains) losses into earnings |  |  |  | 1
Net change in accumulated other comprehensive (loss) income | 0 | 0 | 0 | 1
Balances as of end of period | 0 | 0 | 0 | 0
Foreign Currency Translation Adjustments [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (799) | (610) | (754) | (682)
Net translation of investments in foreign operations | (567) | (475) | (556) | (153)
Net gains (losses) related to hedges of investment in foreign operations | 339 | 276 | 283 | 26
Net change in accumulated other comprehensive (loss) income | (228) | (199) | (273) | (127)
Balances as of end of period | (1,027) | (809) | (1,027) | (809)
Net Unrealized Pension and Other Postretirement Benefit Losses [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (461) | (475) | (488) | (481)
Net unrealized pension and other postretirement benefit gains, net of tax | 27 | 14 | 54 | 20
Net change in accumulated other comprehensive (loss) income | 27 | 14 | 54 | 20
Balances as of end of period | $ (434) | $ (461) | $ (434) | $ (461)

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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 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 2: 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=20435746&loc=d3e637-108580 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=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: 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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