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Short And Long-Term Debt Loss on the Early Extinguishment of Debt (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Debt Disclosure [Abstract]
Loss (gain) on the early extinguishment of debt	$ 8	$ (10)	$ 5	$ 8	[1]	$ (5)	[1]	$ 7	[1]
Long-term Debt, Gross				3,239
Redemption and repurchase of Senior Notes				$ (550)		$ (533)		0
Write off of Deferred Debt Issuance Cost								$ 2
[1] Former parent legacy items and Loss (gain) on the early extinguishment of debt are recorded in Corporate and Other.

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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.

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

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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

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