v3.19.2
Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies [Line Items]            
Gain on Business Interruption Insurance Recovery $ 0 $ 14 $ 0 $ 14    
Operating Lease, Right-of-Use Asset [1],[2] 184   184      
Interest costs capitalized 1 $ 7 8 $ 14    
Current 182   182     $ 167
Non-current 80   80     34
Total 262   262     201
Debt service            
Accounting Policies [Line Items]            
Current 51   51     13
Non-current 8   8     8
Total 59   59     21
Construction major maintenance            
Accounting Policies [Line Items]            
Current 9   9     23
Non-current 39   39     24
Total 48   48     47
Security project insurance            
Accounting Policies [Line Items]            
Current 112   112     120
Non-current 31   31     0
Total 143   143     120
Other            
Accounting Policies [Line Items]            
Current 10   10     11
Non-current 2   2     2
Total $ 12   $ 12     $ 13
Accounting Standards Update 2016-02 [Member]            
Accounting Policies [Line Items]            
Operating Lease, Right-of-Use Asset         $ 191  
[1] Excludes a right-of-use asset and property, plant and equipment, net of $1 million and $17 million, respectively, related to Garrison Energy Center which are included in current assets held for sale on our Consolidated Condensed Balance Sheet. See Note 4 for further information related to the sale of the Garrison Energy Center.
[2] The right-of-use assets associated with our operating leases as of June 30, 2019 are included in other assets on our Consolidated Condensed Balance Sheet.