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Short-Term and Long-Term Debt (Schedule of Extinguishment of Debt) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]
Principal balance outstanding prior to payoff		$ 796	$ 109	$ 287
Unamortized debt issuance costs and discounts		(2)	(1)	(1)
Amount paid to retire debt		(809)	(150)	(309)
Gain (loss) on early extinguishment of debt, pre-tax		(15)	(42)	$ (23)
6.15% Notes, Due 2036 [Member]
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]
Repurchase amount		$ 105
Interest rate		6.15%
4.85% Notes, Due 2021 [Member]
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]
Principal balance outstanding prior to payoff	$ 296
Repurchase amount		$ 4
Interest rate	4.85%	4.85%
LIBOR + 150 bps Term Loan Issued, Due 2022 [Member]
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]
Principal balance outstanding prior to payoff	$ 500
Variable rate	1.50%
8.75% notes, due 2019 [Member]
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]
Repurchase amount			$ 287
Interest rate			8.75%

X

- Definition

The fair value of payments made to legally extinguish a debt.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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- Definition

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

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- Definition

Fair value amount of debt instrument that was repurchased.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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