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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | $ 149,319 | $ 146,722
Components of Other Comprehensive Income (Loss): |  |  |  |
Other Comprehensive Gain, Net of Tax | $ 91 | $ 122 | 221 | 239
Balance at June 30 | 153,380 | 147,388 | 153,380 | 147,388
Related income taxes | 1,483 | $ 487 | 2,897 | $ 917
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (3,589) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | (11) |
Reclassifications |  |  | 232 |
Other Comprehensive Gain, Net of Tax |  |  | 221 |
Balance at June 30 | (3,368) |  | (3,368) |
Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (105) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | (10) |
Reclassifications |  |  | 0 |
Other Comprehensive Gain, Net of Tax |  |  | (10) |
Balance at June 30 | (115) |  | (115) |
Unrealized Holding Gains (Losses) on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (5) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | (7) |
Reclassifications |  |  | 0 |
Other Comprehensive Gain, Net of Tax |  |  | (7) |
Balance at June 30 | (12) |  | (12) |
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 June 30 | (2) |  | (2) |
Defined Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at January 1 |  |  | (3,477) |
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  |  | 6 |
Reclassifications |  |  | 232 |
Other Comprehensive Gain, Net of Tax |  |  | 238 |
Balance at June 30 | $ (3,239) |  | (3,239) |
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Components of Other Comprehensive Income (Loss): |  |  |  |
Employee Benefits for reclassified components |  |  | 301 |
Related income taxes |  |  | $ 69 |

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