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Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Acquisition Costs |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning Balance | $ 58 | $ 63 | $ 61 | $ 64
Cost Incurred | 13 | 12 | 22 | 25
Amortization | (12) | (13) | (24) | (27)
Ending Balances | 59 | 62 | 59 | 62
Fulfillment Costs |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning Balance | 46 | 47 | 46 | 47
Cost Incurred | 9 | 10 | 19 | 19
Amortization | (10) | (10) | (20) | (19)
Ending Balances | $ 45 | $ 47 | $ 45 | $ 47

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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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