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Revenue - Revenue by Major Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Operating revenues	$ 922	$ 920	$ 840
Customer A | Revenue | Customer
Revenue, Major Customer [Line Items]
Operating revenues	$ 560	$ 596	$ 563
Percentage of total	60.00%	65.00%	67.00%
Customer B | Revenue | Customer
Revenue, Major Customer [Line Items]
Operating revenues			$ 84
Percentage of total			10.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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