Loans - Delinquency Ratio for Consumer Loan (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 59,894	$ 62,753
Loans carried at lower of amortized cost or fair value of collateral less cost to sell	57	67
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	20,550	21,702
Loans in process of foreclosure	30	32
Consumer loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	3,203	4,237
One year prior to current year	2,578	2,319
Two years prior to current year	1,387	2,625
Three years prior to current year	2,110	3,932
Four years prior to current year	3,673	2,611
Prior	6,838	5,311
Revolving Loans	0	0
Total	19,789	21,035
Consumer loans | Current - 59 days past due | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	3,203	4,236
One year prior to current year	2,575	2,314
Two years prior to current year	1,378	2,614
Three years prior to current year	2,100	3,930
Four years prior to current year	3,673	2,599
Prior	6,723	5,208
Revolving Loans	0	0
Total	19,652	20,901
Consumer loans | 60 days or more past due | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	1
One year prior to current year	3	5
Two years prior to current year	9	11
Three years prior to current year	10	2
Four years prior to current year	0	12
Prior	115	103
Revolving Loans	0	0
Total	$ 137	$ 134