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Revenue Recognition - Disaggregated Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 $ 3,587    
Other operating income                 23    
Operating revenues $ 902 $ 1,013 $ 882 $ 813 $ 850 $ 976 $ 853 $ 761 3,610 $ 3,440 $ 3,357
Service, Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 (22)    
Other operating income                 (1)    
Operating revenues                 (23)    
Regulated Businesses                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 3,070    
Other operating income                 24    
Alternative revenue programs                 16    
Lease contract revenue                 7    
Operating revenues                 3,094    
Regulated Businesses | Water Services                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 2,867    
Other operating income                 1    
Operating revenues                 2,868    
Regulated Businesses | Water Services | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 1,734    
Other operating income                 1    
Operating revenues                 1,735    
Regulated Businesses | Water Services | Commercial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 639    
Other operating income                 0    
Operating revenues                 639    
Regulated Businesses | Water Services | Fire Service                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 142    
Operating revenues                 142    
Regulated Businesses | Water Services | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 138    
Operating revenues                 138    
Regulated Businesses | Water Services | Public and Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 214    
Other operating income                 0    
Operating revenues                 214    
Regulated Businesses | Wastewater Services                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 167    
Operating revenues                 167    
Regulated Businesses | Wastewater Services | Residential                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 119    
Operating revenues                 119    
Regulated Businesses | Wastewater Services | Commercial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 31    
Operating revenues                 31    
Regulated Businesses | Wastewater Services | Industrial                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 3    
Operating revenues                 3    
Regulated Businesses | Wastewater Services | Public and Other                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 14    
Operating revenues                 14    
Regulated Businesses | Miscellaneous Utility Charge                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 36    
Operating revenues                 36    
Market-Based Businesses                      
Disaggregation of Revenue [Line Items]                      
Revenue from contract with customer                 539    
Operating revenues                 $ 539