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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | $ 146,722 | $ 153,886
Components of Other Comprehensive Income (Loss): |  |  |  |
Other Comprehensive Gain, Net of Tax | $ 182 | $ 189 | 421 | 448
Balance at September 30 | 147,911 | 147,952 | 147,911 | 147,952
Income tax expense | 672 | $ (192) | 1,589 | $ (1,803)
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (3,843) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | 40 |
Reclassifications |  |  | 381 |
Other Comprehensive Gain, Net of Tax |  |  | 421 |
Balance at September 30 | (3,422) |  | (3,422) |
Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (162) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | 37 |
Reclassifications |  |  | 0 |
Other Comprehensive Gain, Net of Tax |  |  | 37 |
Balance at September 30 | (125) |  | (125) |
Unrealized Holding Gains (Losses) on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (2) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | (7) |
Reclassifications |  |  | 0 |
Other Comprehensive Gain, Net of Tax |  |  | (7) |
Balance at September 30 | (9) |  | (9) |
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (2) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | 0 |
Reclassifications |  |  | 0 |
Other Comprehensive Gain, Net of Tax |  |  | 0 |
Balance at September 30 | (2) |  | (2) |
Defined Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (3,677) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | 10 |
Reclassifications |  |  | 381 |
Other Comprehensive Gain, Net of Tax |  |  | 391 |
Balance at September 30 | $ (3,286) |  | (3,286) |
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Components of Other Comprehensive Income (Loss): |  |  |  |
Employee benefits reclassification component, included in employee benefit costs |  |  | 594 |
Income tax expense |  |  | $ 213 |

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