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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, 2019 | Mar. 31, 2018
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | $ 5,070 | $ 4,850
Balance at end of period | 5,031 | 4,962
Foreign Currency Translation Adjustment |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (1,160) | (915)
Other comprehensive income (loss) before reclassifications, net of tax | 30 | 80
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0
Balance at end of period | (1,130) | (835)
Unrecognized Net Actuarial Losses and Prior Service Costs |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (2,923) | (3,052)
Other comprehensive income (loss) before reclassifications, net of tax | 4 | 3
Amounts reclassified from accumulated other comprehensive loss, net of tax | 26 | 27
Balance at end of period | (2,893) | (3,022)
Deferred Derivative Gains (Losses) |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | 7 | (9)
Other comprehensive income (loss) before reclassifications, net of tax | 5 | (4)
Amounts reclassified from accumulated other comprehensive loss, net of tax | (3) | 3
Balance at end of period | 9 | (10)
Total |  |
Changes in Accumulated Other Comprehensive Loss [Roll Forward] |  |
Balance at beginning of period | (4,076) | (3,976)
Other comprehensive income (loss) before reclassifications, net of tax | 39 | 79
Amounts reclassified from accumulated other comprehensive loss, net of tax | 23 | 30
Balance at end of period | $ (4,014) | $ (3,867)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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