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Changes in Accumulated Other Comprehensive Losses - Summary of Changed (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at January 1 |  | $ 149,319 | $ 146,722 | $ 153,886
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  | 4 | (256) | (156)
Reclassifications |  | 603 | 510 | 604
Other Comprehensive Gain, Net of Tax |  | 607 | 254 | 448
Stranded Tax Reclassification to Retained Earnings | $ 562 | (562) |  |
Balance at December 31 | 155,642 | 155,642 | 149,319 | 146,722
Income tax expense (benefit) |  | 5,715 | (48) | (1,729)
Currency Translation Adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at January 1 |  | (105) | (162) | (140)
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  | (19) | 57 | (22)
Reclassifications |  | 0 | 0 | 0
Other Comprehensive Gain, Net of Tax |  | (19) | 57 | (22)
Stranded Tax Reclassification to Retained Earnings |  | 0 |  |
Balance at December 31 | (124) | (124) | (105) | (162)
Unrealized Holding Gains (Losses) on Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at January 1 |  | (5) | (2) | (29)
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  | (5) | (3) | 27
Reclassifications |  | 0 | 0 | 0
Other Comprehensive Gain, Net of Tax |  | (5) | (3) | 27
Stranded Tax Reclassification to Retained Earnings |  | 0 |  |
Balance at December 31 | (10) | (10) | (5) | (2)
Derivatives |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at January 1 |  | (2) | (2) | (2)
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  | 0 | 0 | 0
Reclassifications |  | 0 | 0 | 0
Other Comprehensive Gain, Net of Tax |  | 0 | 0 | 0
Stranded Tax Reclassification to Retained Earnings |  | 0 |  |
Balance at December 31 | (2) | (2) | (2) | (2)
Defined Benefit Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at January 1 |  | (3,477) | (3,677) | (4,120)
Components of Other Comprehensive Income (Loss): |  |  |  |
Before Reclassifications |  | 28 | (310) | (161)
Reclassifications |  | 603 | 510 | 604
Other Comprehensive Gain, Net of Tax |  | 631 | 200 | 443
Stranded Tax Reclassification to Retained Earnings |  | (562) |  |
Balance at December 31 | (3,408) | (3,408) | (3,477) | (3,677)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Components of Other Comprehensive Income (Loss): |  |  |  |
Reclassification, before tax amount |  | 779 |  |
Income tax expense (benefit) |  | 176 |  |
Accumulated Other Comprehensive Loss |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at January 1 |  | (3,589) | (3,843) | (4,291)
Components of Other Comprehensive Income (Loss): |  |  |  |
Other Comprehensive Gain, Net of Tax |  | 607 | 254 | 448
Balance at December 31 | $ (3,544) | $ (3,544) | $ (3,589) | $ (3,843)

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