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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contract Acquisition Costs |  |  |
Revenue other than customer contracts (as a percent) | 1.00% | 1.00% |
Deferred contract costs | $ 159 | $ 153 |
Long-term revenue contracts (as a percent) | 25.00% |  |
Weighted average remaining contract term | 4 years |  |
Deferred Sales Incentives [Member] |  |  |
Contract Acquisition Costs |  |  |
Deferred contract costs | $ 118 | 117 |
Selling, General and Administrative Expenses [Member] |  |  |
Contract Acquisition Costs |  |  |
Deferred contract costs amortization | $ 23 | $ 23 | $ 22
Minimum [Member] |  |  |
Contract Acquisition Costs |  |  |
Deferred revenue recognition period | 1 month |  |
Contract amortization period | 5 years |  |
Maximum [Member] |  |  |
Contract Acquisition Costs |  |  |
Deferred revenue recognition period | 3 months |  |
Contract amortization period | 13 years |  |

X
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Deferred revenue recognition period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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