Long-Term Investments (Schedule Of Net Investment In Leveraged Leases) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2020
Schedule of Investments [Line Items]
Provision for Loan and Lease Losses	$ 58		$ 7
Assets Held for Sale	$ 30	$ 0
Financing Receivable, Allowance for Credit Loss, Writeoff		$ 20	$ 77
Maximum U.S. Corporate Income Tax Rate	21.00%	21.00%	35.00%
Pretax gain on REMA restructuring		$ 12
After tax gain on REMA restructuring		9
Tax liability realized related to REMA restructuring	$ 120
Lease Receivables (net of Non-Recourse Debt)	498	504
Estimated Residual Value of Leased Assets	202	326
Total Investment in Rental Receivables	700	830
Unearned and Deferred Income	(203)	(290)
Gross Investment in Leases	497	540
Deferred Tax Liabilities	(328)	(354)
Net Investments in Leases	$ 169	$ 186
Subsequent Event [Member]
Schedule of Investments [Line Items]
Assets Held for Sale				$ 160

After tax gain on REMA restructuring

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Leveraged Leases Net Investment In Leveraged Leases Disclosure Investment In Leveraged Leases, Gross

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Pretax gain on REMA restructuring

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Tax liability realized related to REMA restructuring

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Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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The estimated portion of pretax income and investment tax credit remaining to be allocated to income over the lease term.

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Taxes arising from arrangements meeting the criteria for classification as leveraged leases due to timing differences between accounting and tax income recognition.

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The net investment in arrangements meeting the criteria for classification as leveraged leases including deferred taxes.

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The gross rentals receivable equal to the future cash flows from the lessee.

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This element represents leveraged lease rentals receivable, net of that portion of the rental applicable to principal and interest on the nonrecourse debt.

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The estimate of the value of the leased asset at the end of the lease term.

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Amount of expense related to estimated loss from loan and lease transactions.

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