Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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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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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of increase from purchase of financing receivable.

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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Financing Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020
Rollforward of the allowance for loan losses
Beginning balance	$ 51
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 5
Provision for Loan, Lease, and Other Losses	12
Write-offs	(1)
Ending balance	56
Commercial Loan [Member]
Rollforward of the allowance for loan losses
Beginning balance	51	$ 49
Ending balance	53
Commercial Loan [Member] \| Accounting Standards Update 2016-13 [Member]
Rollforward of the allowance for loan losses
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			2
Consumer Loan [Member]
Rollforward of the allowance for loan losses
Beginning balance	0
Provision for Loan, Lease, and Other Losses	2
Write-offs	(1)
Ending balance	3
Consumer Loan [Member] \| Accounting Standards Update 2016-13 [Member]
Rollforward of the allowance for loan losses
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 3
Syndicated loans [Member]
Rollforward of the allowance for loan losses
Loans purchased	56	33
Loans sold	7	$ 13
Commercial Loan [Member]
Rollforward of the allowance for loan losses
Accrued interest	14
Total Segment [Member]
Rollforward of the allowance for loan losses
Ending balance	67
Consumer Loan [Member]
Rollforward of the allowance for loan losses
Ending balance	$ 4