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Balance Sheet Components (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]              
Allowance for Doubtful Accounts Receivable, Current $ 6,000,000 $ 5,000,000   $ 6,000,000 $ 5,000,000 $ 6,000,000 $ 5,000,000
Finite-Lived Intangible Assets, Accumulated Amortization 188,000,000     188,000,000   170,000,000  
Amortization of Intangible Assets 6,000,000 5,000,000   18,000,000 16,000,000    
Expenses related to Cascade Crossing 0 0 52,000,000 0 52,000,000    
Syndicated credit facility scheduled to expire in 2018 400,000,000     400,000,000      
Credit Facilities - $300 million revolver 300,000,000     300,000,000      
Debt Instrument, Covenant Description       .65      
Ratio of Indebtedness to Net Capital 0.551     0.551      
Authorized Short-Term Debt 900,000,000     900,000,000      
Short-term Debt 0     0      
Commercial Paper 0     0      
Borrowings 9,000,000     9,000,000      
Line of Credit Facility, Remaining Borrowing Capacity 691,000,000     691,000,000      
Line of Credit Facility, Current Borrowing Capacity 30,000,000     30,000,000      
Letters of credit issued 55,000,000     55,000,000      
Proceeds from Long-term Lines of Credit       305,000,000      
Debt Instrument, Description of Variable Rate Basis       70      
Debt Instrument, Interest Rate During Period       0.90%      
Fees and Commissions       0      
Debt [Member]
              
Valuation and Qualifying Accounts Disclosure [Line Items]              
Proceeds from Issuance of Long-term Debt 280,000,000     280,000,000      
4.39%, August 15, 2014 [Member]
              
Valuation and Qualifying Accounts Disclosure [Line Items]              
Proceeds from Issuance of Long-term Debt 100,000,000     100,000,000      
Debt Instrument, Interest Rate, Stated Percentage 4.39%     4.39%      
4.44%, October 15, 2014 [Member]
              
Valuation and Qualifying Accounts Disclosure [Line Items]              
Proceeds from Issuance of Long-term Debt 100,000,000     100,000,000      
Debt Instrument, Interest Rate, Stated Percentage 4.44%     4.44%      
3.51%, November 17, 2014 [Member]
              
Valuation and Qualifying Accounts Disclosure [Line Items]              
Proceeds from Issuance of Long-term Debt $ 80,000,000     $ 80,000,000      
Debt Instrument, Interest Rate, Stated Percentage 3.51%     3.51%