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Commitments and Contingencies (Environmental) (Details) $ in Millions | Dec. 31, 2018 USD ($) Superfund_Sites | Dec. 31, 2017 USD ($)
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Accrual for Environmental Loss Contingencies Disclosure [Abstract] |  |
Accrued liabilities for environmental matters | $ 42 | $ 48
Superfund Sites [Member] |  |
Accrual for Environmental Loss Contingencies Disclosure [Abstract] |  |
Number of superfund sites | Superfund_Sites | 8 |
Accrual for site contingency | $ 9 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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