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Debt Narrative - Railcar (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Dec. 19, 2014	Dec. 12, 2012	Jan. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 30, 2015	Jan. 29, 2015	Jun. 25, 2014
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ (5)	$ (2)	$ (162)
Railcar Segment
Debt Instrument [Line Items]
Debt held for sale				1,746
Lease Fleet Financings | Railcar Segment
Debt Instrument [Line Items]
Loss on extinguishment of debt					2	$ 2
Use of portion of debt proceeds					409
Proceeds from (Repayments of) Debt					212
Railcars pledged to collateralize mortgages				544	564
ARI 2015 Notes | Railcar Segment
Debt Instrument [Line Items]
Debt face amount								$ 626
Long-term Debt				576
Debt Instrument, Interest Rate, Increase (Decrease)			5.00%
Interest reserve amount					17
Class A-1 Notes | Railcar Segment
Debt Instrument [Line Items]
Debt face amount								$ 250
Interest rate, long-term debt								2.98%
Class A-2 Notes | Railcar Segment
Debt Instrument [Line Items]
Debt face amount								$ 376
Interest rate, long-term debt								4.06%
ARI Revolving Loan | Railcar Segment
Debt Instrument [Line Items]
Line of credit facility							$ 200
Borrowing availability under revolving credit facilities				200
Letters of credit outstanding							$ 100
Citizen Bank Revolver | Railcar Segment
Debt Instrument [Line Items]
Line of credit facility	$ 350
Revolving debt outstanding				243	250
Line of credit current borrowing capacity	250
Additional borrowing availability	$ 100
ARL Term Loans | Railcar Segment
Debt Instrument [Line Items]
Debt face amount				1,100	1,300
ARL Bond Securitization [Member] | Railcar Segment
Debt Instrument [Line Items]
Debt face amount				$ 444	$ 474				$ 325
ARL Bond Securitization [Member] | ARL Class A-1 Notes [Member] | Railcar Segment
Debt Instrument [Line Items]
Debt face amount		$ 110
Interest rate, long-term debt		3.81%
ARL Bond Securitization [Member] | ARL Class A-2 Notes [Member] | Railcar Segment
Debt Instrument [Line Items]
Debt face amount		$ 106
LIBOR | Citizen Bank Revolver | Railcar Segment
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.45%
LIBOR | ARL Bond Securitization [Member] | ARL Class A-2 Notes [Member] | Railcar Segment
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Minimum | ARL Term Loans | Railcar Segment
Debt Instrument [Line Items]
Interest rate, long-term debt				3.07%
Minimum | ARL Bond Securitization [Member] | Railcar Segment
Debt Instrument [Line Items]
Interest rate, long-term debt									2.92%
Maximum | ARL Term Loans | Railcar Segment
Debt Instrument [Line Items]
Interest rate, long-term debt				6.95%
Maximum | ARL Bond Securitization [Member] | Railcar Segment
Debt Instrument [Line Items]
Interest rate, long-term debt									3.97%
ARL | Railcar Segment
Debt Instrument [Line Items]
Weighted average interest rate on debt				3.28%	3.41%

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