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Derivative instruments (Hedged Liabilities and Cumulative Amount) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Current portion of long-term debt [Member] |  |
Derivative [Line Items] |  |
Carrying amounts of hedged liabilities | $ 2,397 | $ 500
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | (2) | 23
Carrying value with discontinued hedging relationships | 1,000 | 500
Hedging adjustments on discontinued hedging relationships | 7 | 23
Long-term debt [Member] |  |
Derivative [Line Items] |  |
Carrying amounts of hedged liabilities | 7,859 | 10,516
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | (264) | (11)
Carrying value with discontinued hedging relationships | 137 | 1,100
Hedging adjustments on discontinued hedging relationships | $ 37 | $ 40

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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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