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Goodwill, Customer Relationships and Other Intangible Assets - Additional Information (Details)
$ in Millions
2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Oct. 31, 2017
reporting_unit
Dec. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Oct. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
Oct. 31, 2019
Oct. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]                
Number of reporting units | reporting_unit 1       1      
Impact to goodwill from business combination deferred state income tax differences         $ 16      
Acquired finite-lived intangible asset amortization expense   $ 139   $ 168 809 $ 798    
Intangible assets and goodwill         $ 16,000      
Finite-lived intangible assets, useful life         9 years      
Goodwill, Impairment Percent             26.00% 16.00%
Goodwill impairment   $ 0 $ 3,708 $ 0 $ 3,708 $ 0    
Customer relationships                
Acquired Finite-Lived Intangible Assets [Line Items]                
Finite-lived intangible assets, useful life         10 years      
Trade names                
Acquired Finite-Lived Intangible Assets [Line Items]                
Finite-lived intangible assets, useful life         3 years      
Developed technology                
Acquired Finite-Lived Intangible Assets [Line Items]                
Finite-lived intangible assets, useful life         4 years