Equity Compensation Plans (Schedule Of Stock Options' Intrinsic Value And Remaining Contractual Term) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding - weighted average remaining contractual term (in years)	4 years 9 months 18 days
Vested and expected to vest - weighted average remaining contractual term (in years)	4 years 9 months 18 days
Exercisable - weighted average remaining contractual term (in years)	3 years 8 months 12 days
Outstanding - aggregate intrinsic value	$ 526
Vested and expected to vest - aggregate intrinsic value	526
Exercisable - aggregate intrinsic value	$ 475