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Business Description and Summary of Significant Accounting Policies Accounting Standard Updates (Details) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 121
Accumulated other comprehensive income (loss):    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect of New Accounting Principle in Period of Adoption   (1)
Accumulated other comprehensive income (loss): | Adjustments for New Accounting Principle, Early Adoption [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect of New Accounting Principle in Period of Adoption   (1)
Retained Earnings [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect of New Accounting Principle in Period of Adoption   122
Retained Earnings [Member] | Adjustments for New Accounting Principle, Early Adoption [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 1
Minimum [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets $ 750  
Maximum [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets $ 800