Loans Receivable - Summary of Changes in Allowance for Loan Losses and Allowance for Losses on Lending Commitments (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Changes in allowance for loan losses
Balance, beginning of period	$ 1,066	$ 803
Net charge-offs	(329)	(337)
Provision	661	654
Other	(77)	(54)
Balance, end of period	1,321	1,066
Specific	187	102
Portfolio	1,016	848
PCI	118	116
Balance, end of period	1,321	1,066
Changes in the allowance for losses on lending commitments
Balance, beginning of period	286	274
Provision	68	20
Other		(8)
Balance, end of period	354	286
Specific	14	3
Portfolio	340	283
Balance, end of period	$ 354	$ 286

Amount of other addition (reduction) in allowance reserve for debit loss.

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- Definition

The roll forward for allowance for losses on lending commitments.

+ References

No definition available.

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- Definition

Amount of allowance for lending commitments.

+ References

No definition available.

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- Definition

Lending Commitments Allowance, Collectively Evaluated for Impairment

+ References

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- Definition

Lending Commitments Allowance, Individually Evaluated for Impairment

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No definition available.

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- Definition

Provision/ ( release ) for losses on lending commitments.

+ References

No definition available.

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- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was 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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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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