Fair Value Measurements (Narrative) (Details) (USD $)							3 Months Ended
	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 International Technology [Member]	Dec. 31, 2013 International Technology [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes and Loans Payable	$ 4,900,000,000	$ 4,900,000,000
Debt Instrument, Fair Value Disclosure			5,100,000,000	5,500,000,000
Cash and Cash Equivalents, Fair Value Disclosure					2,000,000,000	1,600,000,000
Non-cash pre-tax impairment charge							$ 80,000,000	$ 80,000,000