XML 62 R48.htm IDEA: XBRL DOCUMENT v3.5.0.2
Short And Long-Term Debt Other Debt Facilities (Details) - USD ($)
$ in Millions
1 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Oct. 23, 2015
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity $ 125   $ 125
Unsecured Letter of Credit Facility      
Line of Credit Facility [Line Items]      
Increase in borrowing capacity 47    
Letter of Credit, borrowing capacity 135 $ 88  
Outstanding letters of credit 130    
Unsecured Letter of Credit Facility | June 2017      
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity 53    
Unsecured Letter of Credit Facility | September 2018      
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity 16    
Unsecured Letter of Credit Facility | December 2019      
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity $ 66