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Fair Value Measurements and Credit Concentration (Assets and Liabilities Measured on Recurring Basis Table) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Price risk management assets:    
Gross $ 840 $ 693
Price risk management liabilities:    
Gross 619 539
Recurring    
Assets    
Cash and cash equivalents 393 141
Restricted cash and cash equivalents [1] 72 106
Price risk management assets:    
Gross 840 693
NDT funds 964 951
Total assets 2,275 1,897
Price risk management liabilities:    
Gross 619 539
Recurring | Cash and cash equivalents    
Price risk management assets:    
NDT funds 7 11
Recurring | U.S. large-cap    
Price risk management assets:    
NDT funds 623 616
Recurring | U.S. mid/small-cap    
Price risk management assets:    
NDT funds 87 87
Recurring | U.S. Treasury    
Price risk management assets:    
NDT funds 106 98
Recurring | U.S. government sponsored agency    
Price risk management assets:    
NDT funds 5 6
Recurring | Municipality    
Price risk management assets:    
NDT funds 87 83
Recurring | Investment-grade corporate    
Price risk management assets:    
NDT funds 44 47
Recurring | Other    
Price risk management assets:    
NDT funds 3 3
Recurring | Receivables/payables, net    
Price risk management assets:    
NDT funds 2 0
Recurring | Auction Rate Securities    
Price risk management assets:    
Auction rate securities [2] 6 6
Recurring | Level 1    
Assets    
Cash and cash equivalents 393 141
Restricted cash and cash equivalents [1] 72 106
Price risk management assets:    
Gross 0 0
NDT funds 611 601
Total assets 1,076 848
Price risk management liabilities:    
Gross 0 0
Recurring | Level 1 | Cash and cash equivalents    
Price risk management assets:    
NDT funds 7 11
Recurring | Level 1 | U.S. large-cap    
Price risk management assets:    
NDT funds 462 457
Recurring | Level 1 | U.S. mid/small-cap    
Price risk management assets:    
NDT funds 37 37
Recurring | Level 1 | U.S. Treasury    
Price risk management assets:    
NDT funds 106 98
Recurring | Level 1 | Receivables/payables, net    
Price risk management assets:    
NDT funds (1) (2)
Recurring | Level 2    
Price risk management assets:    
Gross 751 597
NDT funds 353 350
Total assets 1,104 947
Price risk management liabilities:    
Gross 598 497
Recurring | Level 2 | U.S. large-cap    
Price risk management assets:    
NDT funds 161 159
Recurring | Level 2 | U.S. mid/small-cap    
Price risk management assets:    
NDT funds 50 50
Recurring | Level 2 | U.S. government sponsored agency    
Price risk management assets:    
NDT funds 5 6
Recurring | Level 2 | Municipality    
Price risk management assets:    
NDT funds 87 83
Recurring | Level 2 | Investment-grade corporate    
Price risk management assets:    
NDT funds 44 47
Recurring | Level 2 | Other    
Price risk management assets:    
NDT funds 3 3
Recurring | Level 2 | Receivables/payables, net    
Price risk management assets:    
NDT funds 3 2
Recurring | Level 3    
Price risk management assets:    
Gross 89 96
Total assets 95 102
Price risk management liabilities:    
Gross 21 42
Recurring | Level 3 | Auction Rate Securities    
Price risk management assets:    
Auction rate securities [2] 6 6
Energy Commodities, net | Recurring    
Price risk management assets:    
Gross 840 693
Price risk management liabilities:    
Gross 619 539
Energy Commodities, net | Recurring | Level 1    
Price risk management assets:    
Gross 0 0
Price risk management liabilities:    
Gross 0 0
Energy Commodities, net | Recurring | Level 2    
Price risk management assets:    
Gross 751 597
Price risk management liabilities:    
Gross 598 497
Energy Commodities, net | Recurring | Level 3    
Price risk management assets:    
Gross 89 96
Price risk management liabilities:    
Gross $ 21 $ 42
[1] Current portion is included in "Restricted cash and cash equivalents" and long-term portion is included in "Other noncurrent assets" on the Balance Sheets.
[2] Included in "Other investments" on the Balance Sheets.