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Balance Sheet Components (Details) |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 09, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Jan. 31, 2016 | Jan. 11, 2016 | Jan. 08, 2016 USD ($) | Dec. 31, 2015 USD ($)
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 238,000,000 |  |  |  |  | $ 227,000,000
Amortization of Intangible Assets |  | 11,000,000 | $ 9,000,000 |  |  |  |
Syndicated credit facility scheduled to expire in 2019 |  | 500,000,000 |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 160,000,000 |  |  |  |  |
Debt Instrument, Covenant Description |  | .65 |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.499 |  |  |  |  |
Short-term debt |  | $ 0 |  |  |  |  | $ 6,000,000
Line of Credit Facility, Remaining Borrowing Capacity |  | 500,000,000 |  |  |  |  |
Letters of credit issued |  | 111,000,000 |  |  |  |  |
Authorized Short-Term Debt |  | 900,000,000 |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  | $ 140,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.81% | 5.80% | 2.51% |
Extinguishment of Debt, Amount |  | 133,000,000 | $ 120,000,000 |  |  |  |
Capital Leases, Future Minimum Payments, Remainder of Fiscal Year |  | $ 5,000,000 |  |  |  |  |
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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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