Percentage of mutual fund that is invested in cash.

No definition available.

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- Definition

Percentage of mutual fund that is invested in fixed income securities.

+ References

No definition available.

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- Definition

Percentage of mutual fund that is invested in large-cap U.S. equities.

+ References

No definition available.

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- Definition

Retirement Benefits [Line Items]

+ References

No definition available.

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

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- Definition

Percentage of investment to total investment within defined benefit plan asset category.

+ References

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Line Items]
Defined Contribution Plan, Cost	$ 35	$ 66	$ 62
Pension Benefits
Retirement Benefits [Line Items]
Large Cap US Equitiies	100.00%	100.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 6
Other Postretirement Benefits
Retirement Benefits [Line Items]
Large Cap US Equitiies	59.00%	59.00%
Fixed Income Securities	40.00%	40.00%
Cash Fund Investments	1.00%	1.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 8
Minimum [Member] \| Other Postretirement Benefits \| Equity [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	25.00%
Minimum [Member] \| Other Postretirement Benefits \| Fixed Income Investments [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	65.00%
Maximum [Member] \| Other Postretirement Benefits \| Equity [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	35.00%
Maximum [Member] \| Other Postretirement Benefits \| Fixed Income Investments [Member]
Retirement Benefits [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	75.00%