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
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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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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.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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-Paragraph 1
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- Definition

Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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No definition available.

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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument
Scheduled maturity of long-term debt in 2020	$ 265
Scheduled maturity of long-term debt in 2021	314
Scheduled maturity of long-term debt in 2022	475
Scheduled maturity of long-term debt in 2023	618
Scheduled maturity of long-term debt in 2024	557
2.875% Notes Due February 7, 2050
Debt Instrument
Face amount of note	$ 500
Interest rate of note	2.875%
3.20% Notes Due April 25, 2029
Debt Instrument
Face amount of note		$ 700
Interest rate of note		3.20%
Credit facility expiring 2023
Debt Instrument
Revolving credit facility	$ 2,000
Credit facility expiring 2019
Debt Instrument
Revolving credit facility	750
3.10 notes due March 26, 2030 [Member]
Debt Instrument
Face amount of note	$ 750
Interest rate of note	3.10%
1.05% notes due September 15, 2027 [Member]
Debt Instrument
Face amount of note	$ 600
Interest rate of note	1.05%
3.95% Notes due November 1, 2028
Debt Instrument
Face amount of note			$ 500
Interest rate of note			3.95%