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Fair Value Measurements - Schedule of Derivatives Recorded in Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Amount of the Hedged Liability | $ 272 | $ 367
Current Portion of Long-term Debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Amount of the Hedged Liability | 601 | 597
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Liability | 1 | 2
Long-term Debt [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Amount of the Hedged Liability | 495 | 496
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Liability | $ (4) | $ 3

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- Definition Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 35 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82917030&loc=d3e75592-113984 + Details
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