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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Amount	$ 84	$ 12	$ 17
Increases in unrecognized tax benefits—prior years	13	81	4
(Decreases) in unrecognized tax benefits—prior years	0	(1)	(9)
Increases in unrecognized tax benefits—current year	36	0	0
(Decreases) in unrecognized tax benefits—current year	0	(8)	0
Settlements with taxing authorities	0	0	0
Amount	133	84	12
Unrecognized tax benefits that, if recognized, would favorably impact the effective rate	$ 133	$ 84	$ 12

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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