Customer Financing (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Customer Financing [Line Items]
Financing Receivable, Past Due	$ 18
Financing Receivable, Nonaccrual	399		$ 388
Financing Receivable, Individually Evaluated for Impairment	412		400
Impaired Financing Receivable, Recorded Investment	399		$ 388
Sales-Type and Direct Financing Leases, Lease Income	15	$ 16
Operating Lease, Lease Income	31	36
Operating Lease, Variable Lease Income	$ 1	$ 3
B Credit Rating
Customer Financing [Line Items]
Percentage of Credit Default Rates Applied to Customers	13.90%
BB Credit Rating
Customer Financing [Line Items]
Percentage of Credit Default Rates Applied to Customers	3.20%
BBB Credit Rating
Customer Financing [Line Items]
Percentage of Credit Default Rates Applied to Customers	0.30%