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Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period |  |  | $ (2,534) |
(Decrease) increase due to amounts reclassified into earnings | $ 0 |  |  | $ 1
Pension and other postretirement benefit gains | 6 | $ 6 | 32 | 29
Balances as of end of period | (2,621) |  | (2,621) |
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (2,502) | (2,151) | (2,534) | (1,919)
Net unrealized gains (losses) | 5 | (20) | 9 | (20)
(Decrease) increase due to amounts reclassified into earnings | 0 | 1 | 2 | 1
Net translation loss of investments in foreign operations | (265) | 45 | (169) | (405)
Net losses gains related to hedges of investment in foreign operations | 135 | (33) | 43 | 162
Pension and other postretirement benefit gains | 6 | 6 | 32 | 29
Net change in accumulated other comprehensive income (loss) | (119) | (3) | (87) | (235)
Balances as of end of period | (2,621) | (2,154) | (2,621) | (2,154)
Net Unrealized Gains (Losses) on Investment Securities [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | 60 | 96 | 58 | 96
Net unrealized gains (losses) | 5 | (20) | 9 | (20)
(Decrease) increase due to amounts reclassified into earnings | 0 | 0 | (2) |
Net translation loss of investments in foreign operations | 0 | 0 | 0 | 0
Net losses gains related to hedges of investment in foreign operations | 0 | 0 | 0 | 0
Pension and other postretirement benefit gains | 0 | 0 | 0 | 0
Net change in accumulated other comprehensive income (loss) | 5 | (20) | 7 | (20)
Balances as of end of period | 65 | 76 | 65 | 76
Foreign Currency Translation Adjustments [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (2,040) | (1,754) | (2,044) | (1,499)
Net unrealized gains (losses) | 0 | 0 | 0 | 0
(Decrease) increase due to amounts reclassified into earnings |  | (1) | 0 | (1)
Net translation loss of investments in foreign operations | (265) | 45 | (169) | (405)
Net losses gains related to hedges of investment in foreign operations | 135 | (33) | 43 | 162
Pension and other postretirement benefit gains | 0 | 0 | 0 | 0
Net change in accumulated other comprehensive income (loss) | (130) | 11 | (126) | (244)
Balances as of end of period | (2,170) | (1,743) | (2,170) | (1,743)
Net Unrealized Pension and Other Postretirement Gains (Losses) [Member] |  |  |  |
Changes in Other Comprehensive income |  |  |  |
Balances as of start of period | (522) | (493) | (548) | (516)
Net unrealized gains (losses) | 0 | 0 | 0 | 0
(Decrease) increase due to amounts reclassified into earnings | 0 | 0 | 0 | 0
Net translation loss of investments in foreign operations | 0 | 0 | 0 | 0
Net losses gains related to hedges of investment in foreign operations | 0 | 0 | 0 | 0
Pension and other postretirement benefit gains | 6 | 6 | 32 | 29
Net change in accumulated other comprehensive income (loss) | 6 | 6 | 32 | 29
Balances as of end of period | $ (516) | $ (487) | $ (516) | $ (487)

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