Fair Value Measurements And Disclosure (Notional Amount Of Our Outstanding Derivative Positions) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Amount of Outstanding Derivative Positions	$ 27,000	$ 22,537
Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount of Outstanding Derivative Positions	6,350	4,750
Cross-Currency Swaps [Member]
Derivative [Line Items]
Notional Amount of Outstanding Derivative Positions	$ 20,650	$ 17,787