Lending Activities - Credit quality of residential mortgages (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 49,421	$ 47,565
Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	666	1,950
2023	2,084	1,412
2022	1,540	2,964
2021	3,017	837
2020	840	388
Prior	1,523	894
Total	9,670	8,445
Residential mortgages \| Consumer Borrower
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,100	6,700
780 and greater \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	120	514
2023	624	528
2022	663	2,280
2021	2,276	619
2020	633	239
Prior	819	497
Total	5,135	4,677
720 - 779 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	399	1,121
2023	1,092	608
2022	579	558
2021	563	168
2020	151	99
Prior	370	209
Total	3,154	2,763
660 - 719 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	147	313
2023	354	256
2022	240	113
2021	144	40
2020	41	37
Prior	217	120
Total	1,143	879
600 - 659 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	2
2023	12	20
2022	37	11
2021	23	8
2020	11	9
Prior	83	51
Total	166	101
Less than 600 \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	2	0
2022	21	2
2021	11	2
2020	4	4
Prior	34	17
Total	$ 72	$ 25

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

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