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Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2014 | Oct. 01, 2014 | Jan. 31, 2015 | Mar. 31, 2014 | Feb. 28, 2014 | Jan. 31, 2014 | Mar. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 29, 2016 | Dec. 30, 2015 | Sep. 26, 2014 | Sep. 03, 2014 | Jun. 25, 2014 | Jun. 23, 2014 | Mar. 27, 2014 | Dec. 12, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | $ (2) | $ (162) | $ 0 |  |  |  |  |  |  |  |
Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from (Repayments of) Debt |  |  | $ 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future debt expected to be incurred by new capitalized entity |  |  |  |  | $ 381 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | $ 626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt (Note 10) | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | $ 2 | 2 |  |  |  |  |  |  |  |  |  |
Letter of Credit [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |
Revolving credit facility, unused borrowing availability |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |
ARI Refinanced Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  | $ 316 |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  |  |  | 194 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Long-term debt after proceeds used to refinance prior debt |  |  |  |  |  | 122 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  | 309 |  |  |  |  |  |  |  |  |
Interest reserve amount |  |  |  |  |  |  |  |  | 17 | 4 |  |  |  |  |  |  |  |  |
ARILL2TermLoan [Domain] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Fleet Financings [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds |  |  |  |  |  |  |  |  | 409 |  |  |  |  |  |  |  |  |  |
Real estate assets pledged to collateralize mortgages |  |  |  |  |  |  |  |  | 564 | 277 |  |  |  |  |  |  |  |  |
ARI 2015 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  | 601 |  |  |  |  |  |  |  |  |  |
Citizen Bank Revolver [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  | 250 | $ 0 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |  |
Additional borrowing availability | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility | $ 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-1 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110
Interest rate, long-term debt |  |  | 2.98% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  | $ 256 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-2 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 106
Interest rate, long-term debt |  |  | 4.06% |  |  |  |  |  | 3.81% |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | $ 376 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class 2014 A-1 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175 |  |  |
Interest rate, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.92% |  |  |
Class 2014 A-2 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150 |  |  |
Interest rate, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.97% |  |  |
RCF Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |
Use of portion of debt proceeds |  |  |  |  |  |  | $ 156 |  |  |  |  |  |  |  |  |  |  |  |
NCF I Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |  |  |
NCF II Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  | $ 135 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  |  |  |  |  | 3.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Heartland Bank Term Loan [Member] [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |  |
Credit Agricole Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 375 |  |  |  |
Banc of America Leasing & Capital, LLC [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62 |  |  |  |  |
Talmer Bank [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 191 |  |  |  |  |
Increase in borrowing capacity [Member] | Letter of Credit [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, unused borrowing availability |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |
LIBOR [Member] | Citizen Bank Revolver [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 1.45% |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Class A-1 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | NCF I Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Credit Agricole Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  |  |  |  |  |  |  |  | 3.35% |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  |  |  |  |  |  |  |  | 6.95% |  |  |  |  |  |  |  |  |  |

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