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Balance Sheet Components (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Current | $ 7,000,000 | $ 5,000,000 | $ 7,000,000 | $ 5,000,000 | $ 6,000,000 | $ 5,000,000
Finite-Lived Intangible Assets, Accumulated Amortization | 182,000,000 |  | 182,000,000 |  | 170,000,000 |
Amortization of Intangible Assets | 6,000,000 | 6,000,000 | 12,000,000 | 11,000,000 |  |
Expenses related to Cascade Crossing | 0 | 52,000,000 | 0 | 52,000,000 |  |
Line of Credit Facility scheduled to terminate in 2017 | 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 | 0.534 |  | 0.534 |  |  |
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 |  |  |
Pledged Financial Instruments, Not Separately Reported, Securities for Letter of Credit Facilities | 54,000,000 |  | 54,000,000 |  |  |
letter of credit facility amount available | 6,000,000 |  | 6,000,000 |  |  |
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% |  |  |  |  |
Debt [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | 280,000,000 |  | 280,000,000 |  |  |
4.35%, May 15 [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Proceeds from Long-term Lines of Credit |  |  | 75,000,000 |  |  |
4.45%, May 30 [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Proceeds from Long-term Lines of Credit |  |  | 75,000,000 |  |  |
4.45%, June 30 [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Proceeds from Long-term Lines of Credit |  |  | 75,000,000 |  |  |
July 31 [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Proceeds from Long-term Lines of Credit |  |  | 80,000,000 |  |  |
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% |  |  |

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