XML 120 R101.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements (Details 1) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
NUG contracts    
Reconciliation of changes in the fair value of NUG contracts    
Beginning Balance, Derivative Assets $ 1 $ 1
Beginning Balance, Derivative Liabilities (108) (137)
Beginning Balance, Net (107) (136)
Unrealized gain (loss), Derivative Assets 0 2
Unrealized gain (loss), Derivative Liabilities (10) (17)
Unrealized gain (loss), Net (10) (15)
Purchases, Derivative Assets 0 0
Purchases, Derivative Liabilities 0 0
Purchases, Net 0 0
Settlements, Derivative Assets (1) (2)
Settlements, Derivative Liabilities 39 46
Settlements, Net 38 44
Ending Balance, Derivative Assets 0 1
Ending Balance, Derivative Liabilities (79) (108)
Ending Balance, Net (79) (107)
FTRs    
Reconciliation of changes in the fair value of NUG contracts    
Beginning Balance, Derivative Assets 7 8
Beginning Balance, Derivative Liabilities (6) (13)
Beginning Balance, Net 1 (5)
Unrealized gain (loss), Derivative Assets 1 (6)
Unrealized gain (loss), Derivative Liabilities (2) (4)
Unrealized gain (loss), Net (1) (10)
Purchases, Derivative Assets 4 16
Purchases, Derivative Liabilities (1) (7)
Purchases, Net 3 9
Settlements, Derivative Assets (8) (11)
Settlements, Derivative Liabilities 8 18
Settlements, Net 0 7
Ending Balance, Derivative Assets 4 7
Ending Balance, Derivative Liabilities (1) (6)
Ending Balance, Net 3 1
FES | FTRs    
Reconciliation of changes in the fair value of NUG contracts    
Beginning Balance, Derivative Assets 4 5
Beginning Balance, Derivative Liabilities (5) (11)
Beginning Balance, Net (1) (6)
Unrealized gain (loss), Derivative Assets 0 (4)
Unrealized gain (loss), Derivative Liabilities (1) (3)
Unrealized gain (loss), Net (1) (7)
Purchases, Derivative Assets 1 10
Purchases, Derivative Liabilities (1) (5)
Purchases, Net 0 5
Settlements, Derivative Assets (4) (7)
Settlements, Derivative Liabilities 6 14
Settlements, Net 2 7
Ending Balance, Derivative Assets 1 4
Ending Balance, Derivative Liabilities (1) (5)
Ending Balance, Net $ 0 $ (1)