Lending Activities - Credit quality of residential mortgages (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 48,544	$ 47,565
Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	322	1,950
2023	2,132	1,412
2022	1,414	2,964
2021	2,992	837
2020	847	388
Prior	1,293	894
Total	9,000	8,445
Residential mortgages \| Consumer Borrower
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,300	1,700
780 and greater \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	55	514
2023	639	528
2022	592	2,280
2021	2,292	619
2020	642	239
Prior	737	497
Total	4,957	4,677
720 - 779 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	198	1,121
2023	1,117	608
2022	537	558
2021	542	168
2020	150	99
Prior	313	209
Total	2,857	2,763
660 - 719 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	69	313
2023	363	256
2022	232	113
2021	131	40
2020	40	37
Prior	158	120
Total	993	879
600 - 659 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	2
2023	11	20
2022	35	11
2021	18	8
2020	10	9
Prior	57	51
Total	131	101
Less than 600 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	2	0
2022	18	2
2021	9	2
2020	5	4
Prior	28	17
Total	$ 62	$ 25

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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