Revenue Recognition (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Capitalized Contract Cost [Abstract]
Diluted Earnings (Loss) Per Share from continuing operations	$ (3.20)	$ 0.79	$ 0.59	$ 0.65	$ 0.66	$ 0.63	$ 0.76	$ 0.97	$ (1.10)	$ 3.02	$ (0.45)
Beginning of period contract liability recorded as customer contract revenue during period									$ 3,795
Customer Fulfillment Costs | Intangible Assets, Amortization Period
Capitalized Contract Cost [Abstract]
Cost of Revenue									$ 395
Diluted Earnings (Loss) Per Share from continuing operations									$ 0.04
Minimum | Deferred Acquisition Costs
Capitalized Contract Cost [Abstract]
Expected customer relationship life	3 years								3 years
Minimum | Deferred Fulfillment Costs
Capitalized Contract Cost [Abstract]
Expected customer relationship life	3 years								3 years
Maximum | Deferred Acquisition Costs
Capitalized Contract Cost [Abstract]
Expected customer relationship life	5 years								5 years
Maximum | Deferred Fulfillment Costs
Capitalized Contract Cost [Abstract]
Expected customer relationship life	5 years								5 years