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Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase in contract assets due to business acquisition $ 153      
Increase in contract liabilities due to business acquisition 117      
Revenue recognized which was included in the contract liability balance 380 $ 450    
Capitalized contract costs, amortization 105 106    
Capitalized contract cost, impairment loss 0 0    
Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment of ASU adoption       $ 208
Retained Earnings | Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment of ASU adoption       $ 208
Product        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Percentage of consolidated revenue (less than)     4.00%  
Sales Commissions        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Capitalized contract costs 357 322    
Conversion or Implementation Costs        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Capitalized contract costs $ 176 $ 97