Loans Receivable - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Loans Receivable [Line Items]
Estimated fair Value of loans receivable	$ 49,200	$ 45,190
Amount of lending commitments held for investment	91,150	93,920
Carrying value of the liabilities relating to lending commitments held for investment	306	291
Estimated fair value of the liabilities relating to lending commitments held for investment	2,690	3,320
Impaired loans receivable (excluding PCI loans) in non-accrual status	455	223
Corporate loans modified in a troubled debt restructuring	154
Lending commitments related to loans modified in a troubled debt restructuring	153
PCI Loans [Member]
Loans Receivable [Line Items]
Loans receivable	3,090	2,120
Outstanding principal balance	7,470	5,540
Accretable yield	500	234
PCI Loans [Member] \| Loans Backed by Commercial Real Estate [Member]
Loans Receivable [Line Items]
Loans receivable	1,140	1,160
PCI Loans [Member] \| Loans Backed by Residential Real Estate [Member]
Loans Receivable [Line Items]
Loans receivable	1,930	941
PCI Loans [Member] \| Other Loans [Member]
Loans Receivable [Line Items]
Loans receivable	21	23
PCI Loans [Member] \| PCI loans acquired during nine months [Member]
Loans Receivable [Line Items]
Fair value of loans at the time of acquisition	1,360
Expected cash flows at the time of acquisition	1,550
Contractually required cash flows at the time of acquisition	3,410
PCI Loans [Member] \| PCI loans acquired during three months [Member]
Loans Receivable [Line Items]
Fair value of loans at the time of acquisition	507
Expected cash flows at the time of acquisition	556
Contractually required cash flows at the time of acquisition	1,170
Level 2 [Member]
Loans Receivable [Line Items]
Estimated fair Value of loans receivable	24,230	23,910
Estimated fair value of the liabilities relating to lending commitments held for investment	1,190	1,350
Level 3 [Member]
Loans Receivable [Line Items]
Estimated fair Value of loans receivable	24,970	21,280
Estimated fair value of the liabilities relating to lending commitments held for investment	$ 1,500	$ 1,970

Amount of lending commitments held-for-investment.

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Carrying value of the liabilities of lending commitments held-for-investment.

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The undiscounted sum of the principal balance owed to the investor at the reporting date whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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Estimated fair value of the liabilities of lending commitments held-for-investment.

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Reflects the amount of troubled debt restructuring related to impaired lending commitments which occurs by granting a concession to a borrower experiencing financial difficulty.

+ References

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Reflects the amount of troubled debt restructuring related to impaired loans which occurs by granting a concession to a borrower experiencing financial difficulty.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of contractually required payments receivable at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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