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Background and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease assets $ 105    
Operating lease liabilities 118    
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease assets   $ 126  
Operating lease liabilities   $ 133  
RETAINED EARNINGS (ACCUMULATED DEFICIT)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adoption, net of tax     $ 141
Cumulative effect of adoption, tax     49
RETAINED EARNINGS (ACCUMULATED DEFICIT) | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adoption, net of tax 22    
RETAINED EARNINGS (ACCUMULATED DEFICIT) | Accounting Standards Update 2014-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adoption, net of tax     $ 141
Cumulative effect of adoption, tax $ 49