Fair Value Measurements Fair Value, Assets Measured On Nonrecurring Basis, Valuation Techniques (Details) $ in Millions	Dec. 31, 2018 USD ($)
Aircraft Value Publications [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equipment under operating leases & Assets held for sale or re-lease, Median	$ 123
Aircraft Value Publications [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equipment under operating leases & Assets held for sale or re-lease, Range	103
Aircraft Value Publications [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equipment under operating leases & Assets held for sale or re-lease, Range	164
Aircraft Condition Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equipment under operating leases & Assets held for sale or re-lease, Net	(22)
Aircraft Condition Adjustments [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equipment under operating leases & Assets held for sale or re-lease, Range	(25)
Aircraft Condition Adjustments [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equipment under operating leases & Assets held for sale or re-lease, Range	$ 3