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Fair Value of Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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 $ 47 $ 57
Total gains and losses (realized/unrealized):    
Included in earnings (27) 17
Included in OCI 1 1
Included in nuclear decommissioning obligations 3 4
Purchases (1) (4)
Transfers into Level 3 15 [1] 10 [1]
Transfers out of Level 3 30 [1] 12 [1]
Balance at the end of the period 68 97
The amount of the total gains for the period included in earnings attributable to the change in unrealized gains relating to assets still held at the end of the period (21) 18
Debt Securities
   
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 12 7
Total gains and losses (realized/unrealized):    
Included in earnings 0 0
Included in OCI 1 1
Included in nuclear decommissioning obligations 0 0
Purchases 0 0
Transfers into Level 3 0 [1] 0 [1]
Transfers out of Level 3 0 [1] 0 [1]
Balance at the end of the period 13 8
The amount of the total gains for the period included in earnings attributable to the change in unrealized gains relating to assets still held at the end of the period 0 0
Trust Fund Investments
   
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 47 42
Total gains and losses (realized/unrealized):    
Included in earnings 0 0
Included in OCI 0 0
Included in nuclear decommissioning obligations 3 4
Purchases 0 0
Transfers into Level 3 0 [1] 0 [1]
Transfers out of Level 3 0 [1] 0 [1]
Balance at the end of the period 50 46
The amount of the total gains for the period included in earnings attributable to the change in unrealized gains relating to assets still held at the end of the period 0 0
Derivatives
   
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 (12) [2] 8 [2]
Total gains and losses (realized/unrealized):    
Included in earnings (27) [2] 17 [2]
Included in OCI 0 [2] 0 [2]
Included in nuclear decommissioning obligations 0 [2] 0 [2]
Purchases (1) [2] (4) [2]
Transfers into Level 3 15 [1],[2] 10 [1],[2]
Transfers out of Level 3 30 [1],[2] 12 [1],[2]
Balance at the end of the period 5 [2] 43 [2]
The amount of the total gains for the period included in earnings attributable to the change in unrealized gains relating to assets still held at the end of the period $ (21) [2] $ 18 [2]
[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] Consists of derivatives assets and liabilities, net.