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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of revenue
Revenue from contracts with customers	$ 888	$ 902	$ 1,751	$ 1,826
Operating lease income	28	25	56	51
Total operating revenues	916	927	1,807	1,877
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	708	718	1,421	1,446
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	652	666	1,312	1,344
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	56	52	109	102
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 180	$ 184	$ 330	$ 380

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