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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.