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Derivative instruments (Hedged Liabilities and Cumulative Amount) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | $ (77) | $ 53
Current portion of long-term debt [Member] |  |
Derivative [Line Items] |  |
Carrying amounts of hedged liabilities | 1,398 | 2,396
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | (2) | (3)
Carrying value with discontinued hedging relationships |  | 1,000
Hedging adjustments on discontinued hedging relationships |  | 3
Long-term debt [Member] |  |
Derivative [Line Items] |  |
Carrying amounts of hedged liabilities | 9,494 | 9,361
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | 79 | (50)
Carrying value with discontinued hedging relationships | 137 | 137
Hedging adjustments on discontinued hedging relationships | $ 37 | $ 37

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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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