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Income Taxes (Details 6) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax Act Enactment [Line Items]        
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ 30 $ 31    
Foreign Earnings Repatriated $ 3,900      
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount     $ 20  
Effective Income Tax Rate Reconciliation Adjustments To Reserves And Prior Years (1.70%) 2.30% 2.80%  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 11 $ 34    
Employee Service Share-based Compensation, Deferred Tax Benefit from Compensation Expense 35 49 $ 44  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 22      
Tax Credit Carryforward, Valuation Allowance     111  
Deferred Tax Assets, Gross 1,636 1,505    
Deferred Tax Assets, Net 553 447    
Deferred Tax Assets, Tax Deferred Expense $ 847 $ 718    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     $ 35 $ 434
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00% 21.00%
Limit on deductibility of interest expense       30.00%
Income tax provision $ 116 $ 79 $ 297  
Unrecognized Tax Benefits $ 175 188 113  
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount     241  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount     47  
Deferred Compensation, Share-based Payments [Member]        
Tax Act Enactment [Line Items]        
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount   18    
Prior Year Divestiture [Member]        
Tax Act Enactment [Line Items]        
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount     19  
Tax Year 2018 [Member]        
Tax Act Enactment [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     $ 399  
Tax Year 2017 [Member]        
Tax Act Enactment [Line Items]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       35.00%
Non-UK [Member]        
Tax Act Enactment [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   7    
Deferred Tax Assets, Gross   13    
Deferred Tax Assets, Net   6    
UNITED KINGDOM        
Tax Act Enactment [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   366    
Deferred Tax Assets, Gross   586    
Deferred Tax Assets, Tax Deferred Expense   $ 220