Income Taxes (Summary Of Activity In Unrecognized Tax Benefits) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
January 1 balance	$ 40	$ 20	$ 14
Additions for tax positions of prior years	30	32	50
Reductions for tax positions of prior years	(25)	(6)	0
Settlements	(30)	(6)	(44)
Statute of limitations	(2)	0	0
December 31 balance	$ 13	$ 40	$ 20