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Shareholders' Equity (Shares Of Treasury Stock) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]      
Balance, Shares 29,611,118 25,700,000  
Balance, Amount $ 712 $ 610  
Treasury stock acquired, net of ESPP shares issued, Shares 3,400,000 3,900,000  
Treasury stock acquired, net of ESPP shares issued, Amount $ 57 $ 102  
Balance, Shares 33,049,744 29,611,118 25,700,000
Balance, Amount $ 769 $ 712 $ 610
Dividends declared to shareholders' 47 47 $ 36
Accrued dividends $ 12 $ 12