Commitments and Contingencies - Capital and Lease Commitments (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Estimate of authorized expenditures required to complete facilities and projects	$ 106
Environmental remediation accrual, undiscounted basis	$ 40

Undiscounted amount of the accrual for environmental loss contingencies.

Reference 1: 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.Y.Q1)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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Data Type:	xbrli:monetaryItemType
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