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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | 254 | 448 | $ 568
Balance at December 31 | 149,319 | 146,722 | 153,886
AOCI Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at January 1 | (3,843) | (4,291) |
Components of Other Comprehensive Income (Loss): |  |  |
Before Reclassifications | (256) |  |
Reclassifications | 510 |  |
Other Comprehensive Gain, Net of Tax | 254 |  |
Balance at December 31 | (3,589) | (3,843) | (4,291)
Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at January 1 | (162) | (140) | (96)
Components of Other Comprehensive Income (Loss): |  |  |
Before Reclassifications | 57 |  |
Reclassifications | 0 |  |
Other Comprehensive Gain, Net of Tax | 57 | (22) | (44)
Balance at December 31 | (105) | (162) | (140)
Unrealized Holding Gains (Losses) on Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at January 1 | (2) | (29) | (8)
Components of Other Comprehensive Income (Loss): |  |  |
Before Reclassifications | (3) |  |
Reclassifications | 0 |  |
Other Comprehensive Gain, Net of Tax | (3) | 27 | (21)
Balance at December 31 | (5) | (2) | (29)
Derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at January 1 | (2) | (2) | (2)
Components of Other Comprehensive Income (Loss): |  |  |
Before Reclassifications | 0 |  |
Reclassifications | 0 |  |
Other Comprehensive Gain, Net of Tax | 0 | 0 | 0
Balance at December 31 | (2) | (2) | (2)
Defined Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at January 1 | (3,677) | (4,120) | (4,753)
Components of Other Comprehensive Income (Loss): |  |  |
Before Reclassifications | (310) |  |
Reclassifications | 510 |  |
Other Comprehensive Gain, Net of Tax | 200 | 443 | 633
Balance at December 31 | (3,477) | $ (3,677) | $ (4,120)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Components of Other Comprehensive Income (Loss): |  |  |
Reclassification, before tax amount | 796 |  |
Reclassification, tax amount | $ 286 |  |

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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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