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Income Taxes - Operating Loss Carryforwards, General Business Credit Carryforwards, and Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
General business credit carryforwards    
Net operating loss carryforwards:    
General business credit carryforwards $ 57 $ 0
Federal    
Net operating loss carryforwards:    
Net operating loss carryforwards 1,674 27
State    
Net operating loss carryforwards:    
Net operating loss carryforwards 4,636 479
Foreign    
Net operating loss carryforwards:    
Net operating loss carryforwards 3,201 $ 465
Expire 2020 through 2037 | Federal    
Net operating loss carryforwards:    
Net operating loss carryforwards 1,700  
Expire 2021 through 2039 | State    
Net operating loss carryforwards:    
Net operating loss carryforwards 4,600  
Expire 2020 through 2039 | Foreign    
Net operating loss carryforwards:    
Net operating loss carryforwards 209  
Expire 2027 through 2039 | General business credit carryforwards    
Net operating loss carryforwards:    
General business credit carryforwards $ 57