Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 835
-SubTopic 30
-Section 55
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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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

No definition available.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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Long-Term Debt (Details Textuals) - USD ($)		1 Months Ended	7 Months Ended	9 Months Ended
Long-Term Debt (Details Textuals) - USD ($)	Oct. 22, 2020	Oct. 27, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Face amount of loan			$ 2,750,000,000	$ 2,750,000,000
Amount drawn down on loan				2,724,000,000	$ 1,433,000,000
Repayment of debt				$ 682,000,000
Unsecured Term Loan Maturing in March 2022 \| Unsecured term loan
Debt Instrument [Line Items]
Face amount of loan							$ 200,000,000
Amount drawn down on loan			$ 0
October 2020 4.375% Junior Subordinated Debentures Due 2080 \| Junior Subordinated Debentures \| Subsequent Event
Debt Instrument [Line Items]
Face amount of loan		$ 230,000,000
Interest rate		4.375%
Series C, 2012, 5.25% Junior Subordinated Debentures Due 2062 [Member] \| Junior Subordinated Debentures \| Subsequent Event
Debt Instrument [Line Items]
Interest rate	5.25%
Repayment of debt	$ 200,000,000
October 2020 0.55% Senior Notes Maturing 2022 \| Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Face amount of loan		$ 750,000,000
Interest rate		0.55%
Unsecured term loan, expiring March 2021 \| Unsecured term loan
Debt Instrument [Line Items]
Face amount of loan							$ 500,000,000
Unsecured term loan, expiring March 2021 \| Unsecured term loan \| Subsequent Event
Debt Instrument [Line Items]
Repayment of debt		$ 500,000,000
Unsecured term loan, expiring June 2021 \| Unsecured term loan
Debt Instrument [Line Items]
Face amount of loan						$ 167,000,000
Unsecured term loan, expiring June 2021 \| Unsecured term loan \| Subsequent Event
Debt Instrument [Line Items]
Repayment of debt		$ 167,000,000