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Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Long-term investments [Member] |
Derivative [Line Items] |
Carrying Amount of Hedged Assets | $ 45
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Assets | (1)
Short-term borrowings, including current portion of long-term debt [Member] |
Derivative [Line Items] |
Carrying Amount of Hedged Liabilities | 1,499
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities | 5
Long-term debt [Member] |
Derivative [Line Items] |
Carrying Amount of Hedged Liabilities | 9,952
Cumulative Amount of Fair Value Hedging Adjustment Gains/(Losses) Included in the Carrying Amount of the Hedged Liabilities | $ 45

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- Definition Amount of asset 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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