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Derivative Instruments and Hedging Activity - Fair Value of Derivative Instruments Included in Balance Sheets (Details) - Cash Flow Hedges [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | $ 26 | $ 18
Fair value of derivative instruments, liabilities | 108 | 50
Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 10 | 10
Assets held for sale [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 4 |
Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 12 | 8
Current Derivative Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, liabilities | 4 | 11
Liabilities Associated with Assets Held for Sale [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, liabilities | 6 |
Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, liabilities | 98 | 39
Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 26 | 18
Fair value of derivative instruments, liabilities | 107 | 47
Foreign Currency Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 0 | 0
Fair value of derivative instruments, liabilities | 1 | 3
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 44 | 15
Fair value of derivative instruments, liabilities | 126 | 47
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 44 | 15
Fair value of derivative instruments, liabilities | 125 | 44
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative instruments, assets | 0 | 0
Fair value of derivative instruments, liabilities | $ 1 | $ 3

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- Definition Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: 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 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + 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 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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