Condensed Consolidated Statements of Financial Position (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Current assets
Cash and cash equivalents	$ 267		$ 81		$ 122
Short-term investments	49		49		41
Receivables
Energy marketing	1,226		786		627
Gas, unbilled and other	1,075		736		839
Less allowance for uncollectible accounts	49		29		39
Total receivables, net	2,252		1,493		1,427
Inventories, net	253		658		384
Assets held for sale	264		283		291
Regulatory assets	250	[1]	114	[1]	72	[1]
Derivative instruments	127		99		100
Other	127		118		93
Total current assets	3,589	[1],[2]	2,895	[1],[2]	2,530	[1],[2]
Long-term assets and other deferred debits
Property, plant and equipment	11,054		10,938		10,450
Less accumulated depreciation	2,367		2,295		2,181
Property, plant and equipment, net	8,687		8,643		8,269
Goodwill	1,827	[3]	1,827	[3]	1,822	[3]
Regulatory assets	696	[1]	705	[1]	868	[1]
Intangible assets	140		145		131
Derivative instruments	11		20		11
Other	314		315		231
Total long-term assets and other deferred debits	11,675		11,655		11,332
Total assets	15,264	[1],[2]	14,550	[1],[2]	13,862	[1],[2]
Current liabilities
Energy marketing trade payables	1,119		671		653
Short-term debt	741		1,171		868
Other accounts payable - trade	434		421		306
Accrued expenses	385		203		161
Temporary LIFO liquidation	252				179
Current portion of long-term debt and capital leases	200				226
Regulatory liabilities	161	[1]	183	[1]	238	[1]
Customer deposits and credit balances	104		136		115
Accrued environmental remediation liabilities	82		70		63
Derivative instruments	63		75		20
Liabilities held for sale	36		40		34
Other	177		148		196
Total current liabilities	3,754	[1],[2]	3,118	[1],[2]	3,059	[1],[2]
Long-term liabilities and other deferred credits
Long-term debt	3,610		3,813		3,324
Accumulated deferred income taxes	1,655		1,628		1,539
Regulatory liabilities	1,550	[1]	1,518	[1]	1,498	[1]
Accrued pension and retiree welfare benefits	405		404		509
Accrued environmental remediation liabilities	358		377		362
Derivative instruments	19		5		4
Other	70		74		74
Total long-term liabilities and other deferred credits	7,667	[1],[2]	7,819	[1],[2]	7,310	[1],[2]
Total liabilities and other deferred credits	11,421	[1],[2]	10,937	[1],[2]	10,369	[1],[2]
Equity
Common stock, $5 par value; 750,000,000 shares authorized: outstanding: 119,247,421 shares at March 31, 2014, 118,888,876 shares at December 31, 2013 and 118,123,770 shares at March 31, 2013	597		595		592
Additional paid-in capital	2,060		2,054		2,020
Retained earnings	1,289		1,063		1,085
Accumulated other comprehensive loss	(135)	[4]	(136)	[4]	(211)	[4]
Treasury shares, at cost: 216,523 shares at March 31, 2014 and December 31, 2013 and March 31, 2013	(8)		(8)		(8)
Total common shareholders’ equity	3,803		3,568		3,478
Noncontrolling interest	40		45		15
Total equity	3,843	[1],[2]	3,613	[1],[2]	3,493	[1],[2]
Total liabilities and equity	$ 15,264	[1],[2]	$ 14,550	[1],[2]	$ 13,862	[1],[2]

[1] Amounts revised to include prior period adjustments. See Note 13 for additional information.

[2] Reflects the reclassification of the Tropical Shipping amounts as held for sale. See Note 12 for additional information.

[3] Excludes goodwill at Tropical Shipping which is classified as held for sale. See Note 12 for additional information.

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