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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Assumptions Used to Determine the Benefit Obligation for Non-Deltic and Deltic Plans) (Details)	Dec. 31, 2019	Dec. 31, 2018
Pension Plans [Member] | Non-Deltic Plans [Member]
Discount rate	3.40%	4.40%
Rate of salaried compensation increase	3.00%	3.00%
Pension Plans [Member] | Deltic Plans [Member]
Discount rate	3.40%	4.40%
Rate of salaried compensation increase	4.00%	4.00%
OPEB [Member] | Non-Deltic Plans [Member]
Discount rate	3.40%	4.40%
OPEB [Member] | Deltic Plans [Member]
Discount rate	3.40%	4.40%

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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- Details

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- Details

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- Details

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- Details

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