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Finance Assets, net (Schedule of Credit Quality of Investments in Finance Leases) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Gross investments in finance leases | $ 922 | $ 1,060
Finance Leases Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross investments in finance leases | 922 | 1,060
Finance Leases Financing Receivable [Member] | Standard & Poor's AAA To A Minus [Member] | Moodys Aaa to A3 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross investments in finance leases | 220 | 218
Finance Leases Financing Receivable [Member] | Standard & Poor's BBB Plus To BBB Minus [Member] | Moodys Baa1 to Baa3 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross investments in finance leases | 550 | 559
Finance Leases Financing Receivable [Member] | Standard & Poor's BB Plus And Lower [Member] | Moodys Ba1 and Lower [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Gross investments in finance leases | $ 152 | $ 283

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- Definition The gross rentals receivable equal to the future cash flows from the lessee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=77899714&loc=d3e42229-112728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 30 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77895730&loc=d3e42840-112730 + Details
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