Supplementary Financial Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental Financial Information [Abstract]
Provision for receivables		$ 13	$ 13	$ 27	$ 26
Provision for inventory		7	10	15	14
Provision for product warranty		3	3	7	7
Depreciation of buildings and equipment		26	44	53	88
Depreciation and obsolescence of equipment on operating leases		57	63	116	127
Amortization of internal use software		16	19	33	37
Amortization of acquired intangible assets		11	12	26	24
Amortization of customer contract costs	[1]	22	25	46	50
Cost of additions to land, buildings and equipment		10	17	19	26
Cost of additions to internal use software		6	15	12	24
Common stock dividends		57	64	115	128
Preferred stock dividends		3	4	7	7
Payments to noncontrolling interests		12	1	13	13
Repurchases related to stock-based compensation		$ 9	$ 1	$ 10	$ 2

[1] __________ (1) Amortization of customer contract costs are reported in Decrease in other current and long-term assets in the Condensed Consolidated Statements of Cash Flows. Refer to Note 5 - Revenue for additional information on contract costs.