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Balance Sheet Components (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 09, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | May 04, 2016 | Jan. 31, 2016 | Jan. 11, 2016 | Jan. 08, 2016 | Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 249,000,000 |  |  | $ 249,000,000 |  |  |  |  |  | $ 227,000,000
Amortization of Intangible Assets |  | 10,000,000 |  | $ 9,000,000 | 22,000,000 | $ 18,000,000 |  |  |  |  |
Syndicated credit facility scheduled to expire in 2019 |  | 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 160,000,000 |  |  | $ 160,000,000 |  |  |  |  |  |
Debt Instrument, Covenant Description |  |  |  |  | 0.65 |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.511 |  |  | 0.511 |  |  |  |  |  |
Short-term debt |  | $ 0 |  |  | $ 0 |  |  |  |  |  | $ 6,000,000
Line of Credit Facility, Remaining Borrowing Capacity |  | 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |
Letters of credit issued |  | 92,000,000 |  |  | 92,000,000 |  |  |  |  |  |
Authorized Short-Term Debt |  | $ 900,000,000 |  |  | $ 900,000,000 |  |  |  |  |  |
Debt Instrument, Redemption, Description |  | 75 |  |  | 200 |  |  |  |  |  |
Unsecured term bank loan rate - minimum |  | 0.00% |  |  | 0.00% |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 75,000,000 |  |  | $ 75,000,000 |  | $ 50,000,000 |  |  | $ 140,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 3.81% | 5.80% | 2.51% |
Extinguishment of Debt, Amount |  |  | $ 133,000,000 |  | 133,000,000 | $ 387,000,000 |  |  |  |  |
Capital Leases, Future Minimum Payments, Remainder of Fiscal Year |  | $ 3,000,000 |  |  | $ 3,000,000 |  |  |  |  |  |
Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 58,000,000 |  |  |  |  |  |  |  |  |  |

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