Long-Term Debt (Senior Notes) (Narrative) (Details) - Jun. 30, 2015 $ in Billions	USD ($) d Rate
Aggregate principle of unsecured senior notes | $	$ 1.4
Interest rate of notes, minimum	3.80%
Interest rate of notes, maximum	4.875%
Number of days in annual interest calculation period | d	360
Debt instrument covenant description	Each of the senior notes is subject to certain customary covenants, with which the Company complied as of June 30, 2015.