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Products and Services Revenues (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) category segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Products and Services Revenues |  |  |  |  |  |  |  |  |  |  |
Number of categories of products and services (categories) | category |  |  |  |  |  |  |  |  | 3 |  |
Operating revenues | $ 2,238 | $ 2,287 | $ 2,222 | $ 2,217 | $ 2,223 | $ 2,198 | $ 2,206 | $ 2,211 | $ 8,964 | $ 8,838 | $ 8,753
Taxes and surcharges included in operating revenues and expenses |  |  |  |  |  |  |  |  | $ 147 | 151 | 154
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Operating revenues | Customer concentration risk |  |  |  |  |  |  |  |  |  |  |
Products and Services Revenues |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 10.00% |  |
Strategic services |  |  |  |  |  |  |  |  |  |  |
Products and Services Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 3,433 | 3,429 | 3,342
Legacy services |  |  |  |  |  |  |  |  |  |  |
Products and Services Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,777 | 2,987 | 3,208
Affiliates and other services |  |  |  |  |  |  |  |  |  |  |
Products and Services Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 2,754 | $ 2,422 | $ 2,203

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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