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Comprehensive Income (Loss) (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Unrealized gain on marketable securities   $ 3,000,000  
Unrealized gain on marketable securities, net of tax   2,000,000  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect $ 4,000,000    
Derivative Notional Amount Agreement Terminated   (650,000,000)
Interest Rate Swap Contracts [Member]      
Derivative [Line Items]      
Derivative Notional Amount Agreement Terminated   650,000,000  
Derivative, Fair Value, Net   12,000,000  
Interest rate swap, remaining unamortized amount   $ 8,000,000