Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Indefinite-life intangibles, Gross Carrying Amount	$ 350		$ 350
Finite-life intangibles, Gross Carrying Amount	1,232		1,344
Finite-life intangibles, Accumulated Amortization	376		487
Finite-life intangibles, Net Carrying Amount	856		857
Amortization of intangible assets	46	$ 42
Gross Intangibles written off	$ 156
Contractual Rights
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	15 years
Finite-life intangibles, Gross Carrying Amount	$ 153		153
Finite-life intangibles, Accumulated Amortization	17		11
Finite-life intangibles, Net Carrying Amount	$ 136		142
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	17 years
Finite-life intangibles, Gross Carrying Amount	$ 325		325
Finite-life intangibles, Accumulated Amortization	137		128
Finite-life intangibles, Net Carrying Amount	$ 188		197
Trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	8 years
Finite-life intangibles, Gross Carrying Amount	$ 15		15
Finite-life intangibles, Accumulated Amortization	3		2
Finite-life intangibles, Net Carrying Amount	$ 12		13
Computer software
Finite-Lived Intangible Assets [Line Items]
Finite-life intangibles, Weighted Average Amortization Lives	5 years
Finite-life intangibles, Gross Carrying Amount	$ 389		501
Finite-life intangibles, Accumulated Amortization	219		346
Finite-life intangibles, Net Carrying Amount	170		155
Contractual Rights
Finite-Lived Intangible Assets [Line Items]
Indefinite-life intangibles, Gross Carrying Amount	350		$ 350
Accumulated amortization for intangibles written off	$ 156

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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