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Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period |  |  | $ (2,784) |
Increase (decrease) due to amounts reclassified into earnings |  | $ 3 |  |
Net unrealized Pension and other postretirement benefits, net of tax | $ 7 | 7 | 8 | $ 39
Balances as of end of period | (2,316) |  | (2,316) |
Tax impact for the changes in each component of accumulated other comprehensive (loss) income |  |  |  |
Investment securities | (1) | (9) | 2 | (7)
Foreign currency translation adjustments | (25) | (6) | (204) | 30
Cash Flow Hedges | (99) | (18) | (306) | 7
Pension and other postretirement benefits | (2) | 7 | (10) | 36
Total tax impact | (127) | (26) | (518) | 66
Tax Benefit Recognized in the period |  |  | 289 |
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (2,428) | (2,621) | (2,784) | (2,534)
Net unrealized gains | (2) | (14) | 4 | (5)
Increase (decrease) due to amounts reclassified into earnings | (1) | (1) | (1) | (3)
Net translation gain of investments in foreign operations | 292 | 29 | 972 | (140)
Net losses related to hedges of investment in foreign operations | (184) | (18) | (515) | 25
Net unrealized Pension and other postretirement benefits, net of tax | 7 | 7 | 8 | 39
Net change in accumulated other comprehensive income (loss) | 112 | 3 | 468 | (84)
Balances as of end of period | (2,316) | (2,618) | (2,316) | (2,618)
Net Unrealized Gains (Losses) on Investment Securities [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | 13 | 65 | 7 | 58
Net unrealized gains | (2) | (14) | 4 | (5)
Increase (decrease) due to amounts reclassified into earnings | 0 | (1) | 0 | (3)
Net translation gain of investments in foreign operations | 0 | 0 | 0 | 0
Net losses related to hedges of investment in foreign operations | 0 | 0 | 0 | 0
Net unrealized Pension and other postretirement benefits, net of tax | 0 | 0 | 0 | 0
Net change in accumulated other comprehensive income (loss) | (2) | (15) | 4 | (8)
Balances as of end of period | 11 | 50 | 11 | 50
Foreign Currency Translation Adjustments [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (1,913) | (2,170) | (2,262) | (2,044)
Net unrealized gains | 0 | 0 | 0 | 0
Increase (decrease) due to amounts reclassified into earnings | (1) | 0 | (1) | 0
Net translation gain of investments in foreign operations | 292 | 29 | 972 | (140)
Net losses related to hedges of investment in foreign operations | (184) | (18) | (515) | 25
Net unrealized Pension and other postretirement benefits, net of tax | 0 | 0 | 0 | 0
Net change in accumulated other comprehensive income (loss) | 107 | 11 | 456 | (115)
Balances as of end of period | (1,806) | (2,159) | (1,806) | (2,159)
Net Unrealized Pension and Other Postretirement Gains (Losses) [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (528) | (516) | (529) | (548)
Net unrealized gains | 0 | 0 | 0 | 0
Increase (decrease) due to amounts reclassified into earnings | 0 | 0 | 0 | 0
Net translation gain of investments in foreign operations | 0 | 0 | 0 | 0
Net losses related to hedges of investment in foreign operations | 0 | 0 | 0 | 0
Net unrealized Pension and other postretirement benefits, net of tax | 7 | 7 | 8 | 39
Net change in accumulated other comprehensive income (loss) | 7 | 7 | 8 | 39
Balances as of end of period | $ (521) | $ (509) | $ (521) | $ (509)

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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=66004124&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=66004124&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=66004124&loc=SL7669686-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 + Details
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