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Summary of Significant Accounting Standards and Policies - ASUs (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Recently Adopted Accounting Standards          
Lease, Practical expedients, Package true        
Lease, Practical expedients, Use of hindsight false        
Operating lease liabilities   $ 182      
Operating lease assets   $ 173   $ 151  
Operating Lease, Liability, Statement of Financial Position   us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent   us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
ASU 2017-04,Intangibles - Goodwill and Other          
Recently Adopted Accounting Standards          
Change in Accounting Principle, Accounting Standards Update, Adopted     true    
AUS 2016-13, Financial Instruments - Credit Losses          
Recently Adopted Accounting Standards          
Change in Accounting Principle, Accounting Standards Update, Adopted     true    
ASU 2016-02, Leases          
Recently Adopted Accounting Standards          
Change in Accounting Principle, Accounting Standards Update, Adopted true        
ASU 2016-02, Leases | Cumulative Effect, Period of Adoption, Adjustment          
Recently Adopted Accounting Standards          
Operating lease liabilities         $ 170
Operating lease assets         $ 161
ASU 2018-14 Compensation - Retirement Benefits          
Recently Adopted Accounting Standards          
Change in Accounting Principle, Accounting Standards Update, Adopted     true    
ASU 2017-12          
Recently Adopted Accounting Standards          
Change in Accounting Principle, Accounting Standards Update, Adopted true