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Schedule Of Effect Of Derivatives Recognized (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 11 | $ 15 |
Derivatives not designated as hedging instruments | 91 | (58) | $ (79)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 8 | 13 |
Interest Expense [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivatives not designated as hedging instruments | 23 | (68) | (32)
Operating Expense [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivatives not designated as hedging instruments | 19 | 26 | (16)
Designated as Hedging Instrument | Interest Rate Swap [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 8 | 7 |
Interest rate swaps | 3 | 4 | (1)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 4 |
Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Interest rate swaps | (50) | 14 | 34
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivatives not designated as hedging instruments | 42 | (42) | (48)
Not Designated as Hedging Instrument | Currency Swap [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 3 | 7 |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 7 | 2 |
Not Designated as Hedging Instrument | Interest Rate Contract |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 1 |
Derivatives not designated as hedging instruments | 1 | 2 | 2
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 1 | 7 |
Not Designated as Hedging Instrument | Commodity Contract |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Derivatives not designated as hedging instruments | $ 1 | $ 0 | $ 0

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226006-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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