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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 4,725 | $ 4,142
Amounts reclassified from accumulated other comprehensive loss | $ 34 | $ 17 | 70 | 59
Balance at end of period | 5,121 | 4,704 | 5,121 | 4,704
Foreign Currency Translation Adjustment |  |  |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (1,155) | (946)
Other comprehensive income (loss) before reclassifications |  |  | 155 | (7)
Amounts reclassified from accumulated other comprehensive loss |  |  | 0 | 0
Balance at end of period | (1,000) | (953) | (1,000) | (953)
Unrecognized Net Actuarial Losses and Prior Service Costs |  |  |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (3,053) | (3,071)
Other comprehensive income (loss) before reclassifications |  |  | (23) | 2
Amounts reclassified from accumulated other comprehensive loss | 33 | 17 | 72 | 64
Balance at end of period | (3,004) | (3,005) | (3,004) | (3,005)
Deferred Derivative Gains (Losses) |  |  |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 10 | 7
Other comprehensive income (loss) before reclassifications |  |  | (19) | (1)
Amounts reclassified from accumulated other comprehensive loss |  |  | (2) | (5)
Balance at end of period | (11) | 1 | (11) | 1
Total |  |  |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (4,198) | (4,010)
Other comprehensive income (loss) before reclassifications |  |  | 113 | (6)
Amounts reclassified from accumulated other comprehensive loss |  |  | 70 | 59
Balance at end of period | $ (4,015) | $ (3,957) | $ (4,015) | $ (3,957)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: 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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