Condensed Consolidated Statements of Financial Position (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Current assets
Cash and cash equivalents	$ 41		$ 31		$ 267
Short-term investments	8		8		49
Receivables
Natural gas, unbilled and other	834		797		1,075
Energy marketing	611		779		1,226
Less allowance for uncollectible accounts	48		35		49
Total receivables, net	1,397		1,541		2,252
Inventories, net	302		716		253
Derivative instruments	189		245		127
Regulatory assets	63		83		250
Assets held for sale					264
Other	79		266		127
Total current assets	2,079		2,890		3,589
Long-term assets and other deferred debits
Property, plant and equipment	11,689		11,552		11,054
Less accumulated depreciation	2,515		2,462		2,367
Property, plant and equipment, net	9,174		9,090		8,687
Goodwill	1,827		1,827		1,827
Regulatory assets	634		631		696
Intangible assets	116		125		140
Derivative instruments	24		42		11
Other	284		304		314
Total long-term assets and other deferred debits	12,059		12,019		11,675
Total assets	14,138		14,909		15,264
Current liabilities
Energy marketing trade payables	586		777		1,119
Short-term debt	526		1,175		741
Other accounts payable – trade	285		312		434
Accrued expenses	259		229		385
Regulatory liabilities	168		112		161
Customer deposits and credit balances	109		125		104
Accrued environmental remediation liabilities	93		87		82
Temporary LIFO liquidation	87				252
Current portion of long-term debt	75		200		200
Derivative instruments	48		88		63
Liabilities held for sale					36
Other	135		114		177
Total current liabilities	2,371		3,219		3,754
Long-term liabilities and other deferred credits
Long-term debt	3,524		3,602		3,610
Accumulated deferred income taxes	1,738		1,724		1,655
Regulatory liabilities	1,612		1,601		1,550
Accrued pension and retiree welfare benefits	526		525		405
Accrued environmental remediation liabilities	326		327		358
Derivative instruments	4		5		19
Other	73		78		70
Total long-term liabilities and other deferred credits	7,803		7,862		7,667
Total liabilities and other deferred credits	10,174		11,081		11,421
Commitments, guarantees and contingencies (see Note 10)
Equity
Common stock, $5 par value; 750,000,000 shares authorized: outstanding: 119,927,459 shares at March 31, 2015, 119,647,149 shares at December 31, 2014, and 119,247,421 shares at March 31, 2014	601		599		597
Additional paid-in capital	2,090		2,087		2,060
Retained earnings	1,444		1,312		1,289
Accumulated other comprehensive loss	(201)	[1]	(206)	[1]	(135)	[1]
Treasury shares, at cost: 216,523 shares at March 31, 2015, December 31, 2014, and March 31, 2014	(8)		(8)		(8)
Total common shareholders’ equity	3,926		3,784		3,803
Noncontrolling interest	38		44		40
Total equity	3,964		3,828		3,843
Total liabilities and equity	$ 14,138		$ 14,909		$ 15,264

[1] All amounts are net of income taxes. Amounts in parentheses indicate debits to accumulated other comprehensive loss.