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Accounting Changes (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Changes
Taxes	$ 633	$ 637
Retained earnings	48	116
Lease receivables
Accounting Changes
Allowance for credit losses	64	56	$ 65
Financing receivables	4,250	4,796
Loan receivables
Accounting Changes
Allowance for credit losses	85	82	$ 98
Financing receivables	$ 8,391	9,181
Adjustment \| ASU 2016-13
Accounting Changes
Allowance for credit losses		56
Taxes		(16)
Retained earnings		(41)
Adjustment \| Lease receivables \| ASU 2016-13
Accounting Changes
Allowance for credit losses		69
Adjustment \| Loan receivables \| ASU 2016-13
Accounting Changes
Allowance for credit losses		$ 98