Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 53	$ 80
Accounts receivable, net	700	671
Inventories:
Materials and supplies	213	202
Fuel	241	266
Deferred income taxes	66	112
Regulatory assets	94	62
Other current assets	75	75
Total current assets	1,442	1,468
Property, plant and equipment, net	18,507	18,057
Regulatory assets	1,290	1,773
Other assets	420	430
Total assets	21,659	21,728
Current liabilities:
Accounts payable	504	467
Income taxes payable	22	48
Accrued employee expenses	79	77
Accrued interest	110	113
Accrued property and other taxes	58	54
Current portion of long-term debt and capital lease obligations	238	267
Regulatory liabilities	55	62
Other current liabilities	208	196
Total current liabilities	1,274	1,284
Regulatory liabilities	879	851
Long-term debt and capital lease obligations	6,639	6,594
Deferred income taxes	4,359	4,168
Other long-term liabilities	721	1,187
Total liabilities	13,872	14,084
Commitments and contingencies (Note 13)
Shareholders' equity:
Preferred stock	2	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	3,315	3,136
Accumulated other comprehensive loss, net	(9)	(12)
Total shareholders' equity	7,787	7,644
Total liabilities and shareholders' equity	$ 21,659	$ 21,728