Fair Value Measurements (Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs (Level 3)) (Details) $ in Millions	Jun. 30, 2015 USD ($)
Fair Value Disclosures [Abstract]
Cost due after three years	$ 489
Cost due after one year through three years	161
Cost due after three years	4
Estimated fair value due in one year or less	489
Estimated fair value due after one year through three years	161
Estimated fair value due after three years	$ 4