Commitments And Contingencies (Schedule Of Components Of Purchase Commitments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder Of Fiscal Year 2012	$ 215
Payments Due by Fiscal Year 2013	295
Payments Due by Fiscal Year 2014	293
Payments Due by Fiscal Year 2015	289
Payments Due by Fiscal Year 2016	244
Payments Due by Fiscal Year, Thereafter	3,150
Payments Due by Fiscal Year, Total	4,486
Core Segment [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder Of Fiscal Year 2012	204
Payments Due by Fiscal Year 2013	259
Payments Due by Fiscal Year 2014	262
Payments Due by Fiscal Year 2015	258
Payments Due by Fiscal Year 2016	214
Payments Due by Fiscal Year, Thereafter	2,865
Payments Due by Fiscal Year, Total	4,062
Performance Segment [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder Of Fiscal Year 2012	7
Payments Due by Fiscal Year 2013	32
Payments Due by Fiscal Year 2014	31
Payments Due by Fiscal Year 2015	31
Payments Due by Fiscal Year 2016	30
Payments Due by Fiscal Year, Thereafter	285
Payments Due by Fiscal Year, Total	416
Specialty Fluids Segment [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder Of Fiscal Year 2012	3
Payments Due by Fiscal Year 2013	2
Payments Due by Fiscal Year, Total	5
New Business Segment [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Remainder Of Fiscal Year 2012	1
Payments Due by Fiscal Year 2013	2
Payments Due by Fiscal Year, Total	$ 3