Revenue (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Operating-type lease and sales-type lease, revenues		$ 483	$ 473	$ 463
Revenue, remaining performance obligation	$ 4,500	4,500
Revenue, remaining performance obligation, expected satisfaction in the next 12 months, percent	54.00%
Revenue, remaining performance obligation, expected satisfaction in year two, percent	24.00%
Contract with customer, asset, net	$ 75	75	65
Contract with customer, liability	$ 1,800	1,800	1,400
Contract with customer, liability, revenue recognized		$ 1,100	$ 638