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Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | $ 24,555 | $ 75,153 |  | $ 79,593 |
Net other comprehensive income (loss) | 380 | (1,124) |  | (2,183) |
Ending Balance | 25,063 | 24,555 |  | 75,153 |
Cumulative Translation Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | (1,944) | (2,793) |  | (1,217) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (26) | (274) | [1] | (1,576) | [1]
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax | 0 | 0 |  | 0 |
Net other comprehensive income (loss) | (26) | (274) |  | (1,576) |
Ending Balance | (1,970) | (1,944) |  | (2,793) |
Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | 2 | (26) |  | (2) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (81) | 16 |  | (19) |
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax | 12 | 12 |  | (5) |
Net other comprehensive income (loss) | (69) | 28 |  | (24) |
Ending Balance | (67) | 2 |  | (26) |
Unrealized gain (loss) on investments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | 0 | 0 |  | 0 |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (10) | 0 |  | 0 |
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax | 0 | 0 |  | 0 |
Net other comprehensive income (loss) | (10) | 0 |  | 0 |
Ending Balance | (10) | 0 |  | 0 |
Accumulated Other Comp Loss |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | (3,270) | (3,360) |  | (1,177) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 362 | (1,140) |  | (2,187) |
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax | 18 | 16 |  | 4 |
Net other comprehensive income (loss) | 380 | (1,124) |  | (2,183) |
Ending Balance | (2,890) | (3,270) |  | (3,360) |
Internal Reorganization [Member] | Cumulative Translation Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  | 1,123 |  |  |
Internal Reorganization [Member] | Derivative Instruments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  | 0 |  |  |
Internal Reorganization [Member] | Unrealized gain (loss) on investments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  | 0 |  |  |
Internal Reorganization [Member] | Accumulated Other Comp Loss |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  | 1,214 |  |  |
Pension Plan |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | (1,247) | (620) |  | 95 |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (191) | (723) |  | (724) |
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax | 5 | 5 |  | 9 |
Net other comprehensive income (loss) | (186) | (718) |  | (715) |
Ending Balance | (1,433) | (1,247) |  | (620) |
Pension Plan | Internal Reorganization [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  | 91 |  |  |
Other Benefit Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance | (81) | 79 |  | (53) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 670 | (159) |  | 132 |
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax | 1 | (1) |  | 0 |
Net other comprehensive income (loss) | 671 | (160) |  | 132 |
Ending Balance | $ 590 | (81) |  | $ 79 |
Other Benefit Plans | Internal Reorganization [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  | $ 0 |  |  |
[1] | The cumulative translation adjustment losses for the year ended December 31, 2020 was primarily driven by the strengthening of the U.S. Dollar ("USD") against the Brazilian Real ("BRL"), partially offset by the weakening of the U.S. Dollar against the Swiss franc ("CHF") and European Euro ("EUR"). The cumulative translation adjustment losses for the years ended December 31, 2019 and 2018 were primarily driven by the strengthening of the U.S. Dollar against the Brazilian Real and European Euro. 2.The unrealized loss on securities during the year ended December 31, 2020 is due to the remeasurement of USD denominated marketable securities held by certain foreign entities at December 31, 2020 with a corresponding offset to cumulative translation adjustment.

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