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Benefit Plans (Termination, Settlement and Curtailment Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 0	$ 6	$ 0
Net loss	10	20	13
Prior service cost (credit)	0	1	3
Termination, settlement, and curtailment costs	10	27	16
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation		10
Net loss		0
Prior service cost (credit)		(5)
Termination, settlement, and curtailment costs	$ 0	$ 5	$ 0

X

- Definition

Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Benefit Obligation

+ References

No definition available.

+ Details

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- Definition

Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Net Losses

+ References

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- Definition

Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Prior Service Cost (Credit)

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

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