Consolidated Balance Sheets Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 119	$ 80
Accounts receivable, net	620	671
Inventories:
Materials and supplies	211	202
Fuel	276	266
Deferred income taxes	90	112
Regulatory assets	68	62
Other current assets	58	75
Total current assets	1,442	1,468
Property, plant and equipment, net	18,246	18,057
Regulatory assets	1,712	1,773
Other assets	424	430
Total assets	21,824	21,728
Current liabilities:
Accounts payable	419	467
Income taxes payable	37	48
Accrued employee expenses	114	77
Accrued interest	114	113
Accrued property and other taxes	90	54
Current portion of long-term debt and capital lease obligations	227	267
Regulatory liabilities	59	62
Other current liabilities	200	196
Total current liabilities	1,260	1,284
Regulatory liabilities	869	851
Long-term debt and capital lease obligations	6,864	6,594
Deferred income taxes	4,230	4,168
Other long-term liabilities	1,137	1,187
Total liabilities	14,360	14,084
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock	36	41
Common stock - 750 shares authorized, no par value, 357 shares issued and outstanding	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	2,961	3,136
Accumulated other comprehensive loss, net	(12)	(12)
Total shareholders' equity	7,464	7,644
Total liabilities and shareholders' equity	$ 21,824	$ 21,728