Summary of Accounting Policies (Variable Interest Entities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Total assets	$ 26,597	$ 26,272
Property, plant and equipment (net of accumulated depreciation - 2023: $4,080; 2022: $3,687)	$ 5,584	5,584
Variable Interest Entity, Primary Beneficiary
Schedule of Investments [Line Items]
Ownership percentage	50.00%
Total assets	$ 626	627
Property, plant and equipment (net of accumulated depreciation - 2023: $4,080; 2022: $3,687)	529	544
Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments [Line Items]
Maximum exposure to loss	$ 208	$ 223