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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Change in accounting estimates |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | $ 986 | $ 1,048 | $ 1,099
Net income | $ 321 | $ 268 | $ 238 | $ 247 | $ 216 | $ 245 | $ 256 | $ 253 | 1,074 | $ 970 | $ 964
Switch, circuit and cable network equipment | Service life |  |  |  |  |  |  |  |  |  |  |
Change in accounting estimates |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | 20 |  |
Net income |  |  |  |  |  |  |  |  | (12) |  |
Pension, Supplemental and Other Postretirement Benefit Plans | Change in accounting method accounted for as change in estimate |  |  |  |  |  |  |  |  |  |  |
Change in accounting estimates |  |  |  |  |  |  |  |  |  |  |
Decrease in defined benefit plans net periodic benefit cost |  |  |  |  |  |  |  |  | $ (7) |  |
Decrease in defined benefit plans net periodic benefit cost (financial effect) |  |  |  |  |  |  |  |  | The change in methodology resulted in a decrease of $7 million to our net periodic benefit cost for the year ended December 31, 2015 |  |

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- Definition Disclosure of the effect on income from continuing operations, net income (or other appropriate captions of changes in applicable net assets or performance indicator), and any related per-share amounts of the current period when a change in accounting estimate affects several future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22595-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e777-108305 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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