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Fair Value of Financial Instruments (Level 3 Inputs Recon - Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset $ 1,251 $ 2,220
Level 3    
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements    
Balance at the beginning of the period 38 161
Total gains/(losses) realized/unrealized:    
Included in earnings 12 (112)
Included in nuclear decommissioning obligations (1) (2)
Purchases (28) (15)
Transfers into Level 3 (18) [1] 3 [2]
Transfers out of Level 3 (1) [1] 3 [2]
Balance at the end of the period 2 38
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of end of period (14) (30)
Derivative [Member] | Level 3    
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements    
Balance at the beginning of the period (33) [3] 80 [4]
Total gains/(losses) realized/unrealized:    
Included in earnings 12 [3] (100) [4]
Included in nuclear decommissioning obligations 0 [3] 0 [4]
Purchases (29) [3] (19) [4]
Transfers into Level 3 (18) [1],[3] 3 [2],[4]
Transfers out of Level 3 (1) [1],[3] 3 [2],[4]
Balance at the end of the period [3] (69) (33)
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of end of period (14) [3] (30) [4]
Trust Fund Investment [Member] | Level 3    
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements    
Balance at the beginning of the period 54 52
Total gains/(losses) realized/unrealized:    
Included in earnings 0 0
Included in nuclear decommissioning obligations (1) (2)
Purchases 1 4
Transfers into Level 3 0 [1] 0 [2]
Transfers out of Level 3 0 [1] 0 [2]
Balance at the end of the period 54 54
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of end of period 0 0
Other Financial Instrument [Member] | Level 3    
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements    
Balance at the beginning of the period 0 11
Total gains/(losses) realized/unrealized:    
Included in earnings   (11)
Included in nuclear decommissioning obligations   0
Purchases   0
Transfers into Level 3 [2]   0
Transfers out of Level 3 [2]   0
Balance at the end of the period   0
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of end of period   0
Debt Securities [Member] | Level 3    
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements    
Balance at the beginning of the period 17 18
Total gains/(losses) realized/unrealized:    
Included in earnings 0 (1)
Included in nuclear decommissioning obligations 0 0
Purchases 0 0
Transfers into Level 3 0 [1] 0 [2]
Transfers out of Level 3 0 [1] 0 [2]
Balance at the end of the period 17 17
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of end of period 0 0
Commodity contracts    
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset 1,202 2,220
Commodity contracts | Fair Value, Measurements, Recurring [Member]    
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset 1,202 2,220
Commodity contracts | Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset 92 149
Commodity contracts | Coal Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset 0 0
Commodity contracts | Financial Transmission Rights [Member] | Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset 52 63
Commodity contracts | Power Contracts | Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes    
Derivative Asset, Fair Value, Gross Asset $ 40 $ 86
[1] Transfers in/out of Level 3 are related to the availability of external broker quotes, and are valued as of the end of the reporting period. All transfers in/out are with Level 2.
[2] Transfers in/out of Level 3 are related to the availability of external broker quotes, and are valued as of the end of the reporting period. All transfers in/out are with Level 2.
[3] Consists of derivatives assets and liabilities, net.
[4] Consists of derivatives assets and liabilities, net.