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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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