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Basis of Presentation and Accounting Policies Level 4 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
New Accounting Pronouncement or Change in Accounting Principle, Description On January 1, 2017 the Company adopted new stock compensation guidance issued by the Financial Accounting Standards Board ("FASB") on a prospective basis. The updated guidance requires the excess tax benefit or tax deficiency on vesting or settlement of stock-based awards to be recognized in earnings as an income tax benefit or expense, respectively, instead of as an adjustment to additional paid-in capital. The new guidance also requires the related cash flows to be presented in operating activities instead of in financing activities. The amount of excess tax benefit or tax deficiency realized on vesting or settlement of awards depends upon the difference between the market value of awards at vesting or settlement and the grant date fair value recognized through compensation expense. The excess tax benefit or tax deficiency is a discrete item in the reporting period in which it occurs and is not considered in determining the annual estimated effective tax rate for interim reporting.  
Additional Paid-in Capital [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation $ 0 $ 24
Stock-based Compensation [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Effective Income Tax Rate Reconciliation, Deduction, Amount $ 7 $ 0