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Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |
Beginning balance |  |  | $ (2,428) |  |
Net unrealized Pension and other postretirement benefits, net of tax | $ 1 | $ 9 | 29 | $ 1 |
Balances as of June 30 | (2,483) |  | (2,483) |  | $ (2,428)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income |  |  |  |  |
Investment securities | (2) | 0 | (5) | 3 | 1
Foreign currency translation adjustments | (70) | 12 | (68) | (179) |
Net investment hedges | 107 | (67) | 53 | (207) |
Pension and other postretirement benefits | 6 | 1 | 9 | (8) |
Total tax impact | 41 | (54) | (11) | (391) |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |
Beginning balance | (2,381) | (2,470) | (2,428) | (2,784) | (2,784)
Net unrealized gains | (7) |  | (20) | 6 |
Net translation of investments in foreign operations | (416) | 135 | (224) | 680 |
Net gains (losses) related to hedges of investment in foreign operations | 320 | (102) | 158 | (331) |
Net unrealized Pension and other postretirement benefits, net of tax | 1 | 9 | 29 | 1 |
Other - Net Unrealized Gains (Losses) on Equity Securities |  |  | 2 |  |
Net change in accumulated other comprehensive (loss) income | (102) | 42 | (55) | 356 |
Balances as of June 30 | (2,483) | (2,428) | (2,483) | (2,428) | (2,428)
Net Unrealized Gains (Losses) on Investment Securities [Member] |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |
Beginning balance | (11) | 13 | 0 | 7 | 7
Net unrealized gains | (7) |  | (20) | 6 |
Net translation of investments in foreign operations | 0 | 0 | 0 | 0 |
Net gains (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 |
Other - Net Unrealized Gains (Losses) on Equity Securities |  |  | 2 |  |
Net change in accumulated other comprehensive (loss) income | (7) | 0 | (18) | 6 |
Balances as of June 30 | (18) | 13 | (18) | 13 | 0
Foreign Currency Translation Adjustments [Member] |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |
Beginning balance | (1,931) | (1,946) | (1,961) | (2,262) | (2,262)
Net unrealized gains | 0 |  | 0 | 0 |
Net translation of investments in foreign operations | (416) | 135 | (224) | 680 |
Net gains (losses) related to hedges of investment in foreign operations | 320 | (102) | 158 | (331) |
Net unrealized Pension and other postretirement benefits, net of tax | 0 | 0 | 0 | 0 |
Other - Net Unrealized Gains (Losses) on Equity Securities |  |  | 0 |  |
Net change in accumulated other comprehensive (loss) income | (96) | 33 | (66) | 349 |
Balances as of June 30 | (2,027) | (1,913) | (2,027) | (1,913) | (1,961)
Net Unrealized Pension and Other Postretirement Gains (Losses) [Member] |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |
Beginning balance | (439) | (537) | (467) | (529) | (529)
Net unrealized gains | 0 |  | 0 | 0 |
Net translation of investments in foreign operations | 0 | 0 | 0 | 0 |
Net gains (losses) related to hedges of investment in foreign operations | 0 | 0 | 0 | 0 |
Net unrealized Pension and other postretirement benefits, net of tax | 1 | 9 | 29 | 1 |
Other - Net Unrealized Gains (Losses) on Equity Securities |  |  | 0 |  |
Net change in accumulated other comprehensive (loss) income | 1 | 9 | 29 | 1 |
Balances as of June 30 | $ (438) | $ (528) | $ (438) | $ (528) | $ (467)

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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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