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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]      
Accrued capital expenditures $ 44,712us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 33,184us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 26,208us-gaap_CapitalExpendituresIncurredButNotYetPaid
Dividends declared but not paid 65,790us-gaap_DividendsPayableCurrentAndNoncurrent 62,528us-gaap_DividendsPayableCurrentAndNoncurrent 59,789us-gaap_DividendsPayableCurrentAndNoncurrent
Liabilities assumed relating to acquisition of SCE Four Corners’ interest (see Note 3) 0us-gaap_LiabilitiesAssumed1 145,609us-gaap_LiabilitiesAssumed1 0us-gaap_LiabilitiesAssumed1
Cash Paid During Period [Abstract]      
Income tax (benefit), net of refunds (102,154)us-gaap_IncomeTaxesPaidNet 18,537us-gaap_IncomeTaxesPaidNet 2,543us-gaap_IncomeTaxesPaidNet
Interest, net of amounts capitalized $ 177,074us-gaap_InterestPaidNet $ 184,010us-gaap_InterestPaidNet $ 200,923us-gaap_InterestPaidNet