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Note Non-consolidated variable interest entities - Additional Information (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2013 | Sep. 30, 2011
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PRLP 2011 Holding, LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity Method Investment Ownership Percentage | 24.90% |  |  | 24.90%
Cash Received From Investee |  |  |  | $ 48
PR Asset Portfolio 2013-1 International, LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity Method Investment Ownership Percentage | 24.90% |  | 24.90% |
Cash Received From Investee |  |  | $ 92 |
FNMA, GNMA, FHLMC VIE |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement | $ 10,400 | $ 10,600 |  |

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