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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of Financial Information for Joint Ventures
The following tables present summarized financial information for these joint ventures:
                 
Year Ended December 31
 
2019
 
 
2018
 
(In millions)
 
 
 
 
Total assets
   
$      2,261
 
   
$      1,924
 
Total liabilities
 
 
1,727
 
   
1,451
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                         
Year Ended December 31
 
2019
 
 
2018
   
2017
 
Revenues
   
$        804
 
   
$       731
     
$         731
 
Net income
 
 
106
 
   
114
     
261
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Principal Service Lives