Leases (Schedule Of Future Minimum Commitments) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital Lease Obligations, 2014	$ 51
Capital Lease Obligations, 2015	52
Capital Lease Obligations, 2016	51
Capital Lease Obligations, 2017	50
Capital Lease Obligations, 2018	49
Capital Lease Obligations, Later years	345
Total minimum capital lease payments	598
Less imputed interest costs	(203)
Present value of net minimum lease payments	395
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Lease Obligations, 2014	191
Operating Lease Obligations, 2015	184
Operating Lease Obligations, 2016	152
Operating Lease Obligations, 2017	106
Operating Lease Obligations, 2018	95
Operating Lease Obligations, Later years	241
Total minimum operating lease payments	$ 969