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Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Acquisition Costs |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning Balance | $ 59 | $ 62 | $ 61 | $ 64
Cost Incurred | 10 | 13 | 32 | 38
Amortization | (12) | (13) | (36) | (40)
Ending Balances | 57 | 62 | 57 | 62
Fulfillment Costs |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning Balance | 45 | 47 | 46 | 47
Cost Incurred | 9 | 9 | 28 | 28
Amortization | (9) | (10) | (29) | (29)
Ending Balances | $ 45 | $ 46 | $ 45 | $ 46

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- 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 -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + 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 -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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