Revenue Recognition - Capitalized Sales Commissions and Conversion or Implementation Costs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Sales Commissions
Capitalized Contract Cost [Line Items]
Capitalized contract costs	$ 437	$ 402
Conversion or Implementation Costs
Capitalized Contract Cost [Line Items]
Capitalized contract costs	$ 374	$ 290

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054

Name:	us-gaap_CapitalizedContractCostGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant