Fair Value Measurements (Aggregate Fair Value of Derivative Financial Instruments and Debt) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Fair Value at June 30, 2013 [Member]
Assets:
Foreign exchange contracts	$ 308
Total assets	308
Liabilities:
Debt	23,728
Foreign exchange contracts	69
Total liabilities	23,797
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Assets:
Foreign exchange contracts	0
Total assets	0
Liabilities:
Debt	23,553
Foreign exchange contracts	0
Total liabilities	23,553
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Foreign exchange contracts	308
Total assets	308
Liabilities:
Debt	175
Foreign exchange contracts	69
Total liabilities	244
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Foreign exchange contracts	0
Total assets	0
Liabilities:
Debt	0
Foreign exchange contracts	0
Total liabilities	$ 0