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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
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Mar. 31, 2018 | Mar. 31, 2017
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | $ 4,850 | $ 4,725
Balance at end of period | 4,962 | 4,960
Foreign Currency Translation Adjustment |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (915) | (1,155)
Other comprehensive income (loss) before reclassifications, net of tax | 80 | 78
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0
Balance at end of period | (835) | (1,077)
Unrecognized Net Actuarial Losses and Prior Service Costs |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (3,052) | (3,053)
Other comprehensive income (loss) before reclassifications, net of tax | 3 | 4
Amounts reclassified from accumulated other comprehensive loss, net of tax | 27 | 20
Balance at end of period | (3,022) | (3,029)
Deferred Derivative Gains (Losses) |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (9) | 10
Other comprehensive income (loss) before reclassifications, net of tax | (4) | (6)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 3 | (1)
Balance at end of period | (10) | 3
Total |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (3,976) | (4,198)
Other comprehensive income (loss) before reclassifications, net of tax | 79 | 76
Amounts reclassified from accumulated other comprehensive loss, net of tax | 30 | 19
Balance at end of period | $ (3,867) | $ (4,103)

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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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