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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]      
Restricted cash $ 19 $ 13 $ 17
Accounts Receivable [Abstract]      
Contract receivable retainage 61 59  
Unbilled contracts receivable 104 108  
Self-Insurance [Abstract]      
Accrued liabilities and other liabilities 299 269  
Other Operating Income (Expense)      
Derivatives and Hedging Activities [Abstract]      
Gain (loss) related to changes in fair value of embedded derivatives $ (3) $ (27) $ 12
Internal-use software | Minimum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 3 years    
Internal-use software | Maximum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 5 years    
Purchased service portfolios | Minimum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 5 years    
Purchased service portfolios | Maximum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 25 years    
Patents, trademarks/trade names | Minimum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 4 years    
Patents, trademarks/trade names | Maximum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 40 years    
Customer relationships and other | Minimum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 1 year    
Customer relationships and other | Maximum      
Finite-Lived Intangible Assets, Net [Abstract]      
Estimated Useful Lives 20 years