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Business Combinations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred   $ 81  
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 18 18 $ 7
2018 36 36  
2019 33 33  
2020 31 31  
2021 28 28  
2022 25 25  
Thereafter $ 200 200  
Business Combination Goodwill, Expected Tax Deductible Amount, Accumulated Amortization   $ 4  
Distribution Relationships      
Business Acquisition [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years    
Non-compete Agreements      
Business Acquisition [Line Items]      
Finite-Lived Intangible Asset, Useful Life 5 years    
Trade Names      
Business Acquisition [Line Items]      
Finite-Lived Intangible Asset, Useful Life 8 years    
Distribution Relationships      
Business Acquisition [Line Items]      
Finite-Lived Intangible Assets, Gross     33
Non-compete Agreements      
Business Acquisition [Line Items]      
Finite-Lived Intangible Assets, Gross     1
Trade Names      
Business Acquisition [Line Items]      
Finite-Lived Intangible Assets, Gross     1
Xchange      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred $ 81    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     2
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedrResstrictedCash     4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     36
Goodwill, Acquired During Period $ 46    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     96
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable     8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     8
Redeemable Noncontrolling Interest, Equity, Carrying Amount     7
Business Acquisition, Goodwill, Expected Tax Deductible Amount     $ 65