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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse3100000031falsetruefalsefalsefalse2truefalsefalse5100000051falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFair value of a derivative liability that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 falsefalseDerivatives not designated as hedge, Liabilities2245Derivative financial instruments (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue