XML 139 R123.htm IDEA: XBRL DOCUMENT v3.20.4
Income Taxes - Operating Loss Carryforwards, General Business Credit Carryforwards, and Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
General business credit carryforwards    
Net operating loss carryforwards:    
General business credit carryforwards $ 41 $ 57
Federal    
Net operating loss carryforwards:    
Net operating loss carryforwards 443 1,674
State    
Net operating loss carryforwards:    
Net operating loss carryforwards 3,944 4,636
Foreign    
Net operating loss carryforwards:    
Net operating loss carryforwards 3,343 $ 3,201
Expire 2021 through 2037 | Federal    
Net operating loss carryforwards:    
Net operating loss carryforwards 443  
Expire 2021 through 2040 | State    
Net operating loss carryforwards:    
Net operating loss carryforwards 3,900  
Expire 2020 through 20440 | Foreign    
Net operating loss carryforwards:    
Net operating loss carryforwards 263  
Expire 2025 through 2038 | General business credit carryforwards    
Net operating loss carryforwards:    
General business credit carryforwards $ 41