Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Summary Of The Borrowings Outstanding And Capacity Available Under The Facility) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Summary of the borrowings outstanding and capacity available under the facility
Capacity	$ 3,500
Borrowings	115
Letters of Credit	9
Capacity Available	$ 3,376

Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Summary Of The Borrowings Outstanding And Capacity Available Under The Facility) (Details) (USD $)
In Millions, unless otherwise specified

Mar. 31, 2014

Summary of the borrowings outstanding and capacity available under the facility

$ 3,500

Borrowings

115

Letters of Credit

Capacity Available

$ 3,376