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No authoritative reference available. false 15 Environmental accruals for known contamination in carrying amount recorded for indemnifications 4 us-gaap_AccrualForEnvironmentalLossContingenciesNet us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 true true false false 251000000 251000000 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false xbrli:monetaryItemType monetary Present value of the estimated aggregate accrual for environmental loss contingencies as of the balance sheet date (if the accrual qualifies for discounting). 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