Subsequent Events Renewal Expansion (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2012	Sep. 30, 2012
Subsequent Event [Line Items]
Number of Global Business Units in 2012		9
Number of Business Segments	6
Project Renewal [Member]
Subsequent Event [Line Items]
Number of Global Business Units in 2012		9
Restructuring and Related Activities, Completion Date		Jun. 30, 2015
Renewal Expansion, Low Estimate [Domain]
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Cost		250
Cash expected to be paid for restructuring		225
Renewal Expansion, High Estimate [Domain]
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Cost		275
Cash expected to be paid for restructuring		250
Renewal Expansion Phase [Domain]
Subsequent Event [Line Items]
Employee Related Cash Restructuring Costs As A Percentage Of Total Cash Restructuring Costs		80.00%
Renewal Combined, Low Estimate [Domain]
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Cost		340
Cash expected to be paid for restructuring		300
Renewal Combined, High Estimate [Domain]
Subsequent Event [Line Items]
Restructuring and Related Cost, Expected Cost		375
Cash expected to be paid for restructuring		340