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Products and Services Revenue - Operating Revenues for Products and Services (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues | [1] | $ 1,918 | $ 2,030
IP and Data Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues |  | 136 | 140
Transport and Infrastructure |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues |  | 657 | 701
Voice and Collaboration |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues |  | 395 | 418
IT and Managed Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues |  | 1 | 1
Regulatory Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues |  | 46 | 48
Affiliate Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues |  | $ 683 | $ 722
[1] | Reclassifications were made within certain 2019 comparative figures due to the retrospective application of an accounting policy election during the first quarter of 2020. Refer to Note 1—Background and our Form 8-K filing dated May 7, 2020 for further information.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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