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Derivative Instruments (Details 1) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivative Assets
Fair Value	$ 244	$ 237
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(136)	(133)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	(3)	0
Net Fair Value	105	104
Derivative Liabilities
Fair Value	(272)	(281)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	136	133
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	2	8
Net Fair Value	(134)	(140)
Commodity contracts
Derivative Assets
Fair Value	226	228
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(128)	(125)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	(3)	0
Net Fair Value	95	103
Derivative Liabilities
Fair Value	(140)	(131)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	128	125
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	2	3
Net Fair Value	(10)	(3)
FTRs
Derivative Assets
Fair Value	17	8
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(8)	(8)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	9	0
Derivative Liabilities
Fair Value	(8)	(13)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	8	8
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	5
Net Fair Value	0	0
NUGs
Derivative Assets
Fair Value	1	1
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	1	1
Derivative Liabilities
Fair Value	(124)	(137)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	$ (124)	$ (137)

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