Loans and Allowance for Credit Losses - Loans Charged-off (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	$ 53	$ 47			$ 99	$ 100
Originated in 2023/2022	44	28			123	255
Originated in 2022/2021	83	57			220	144
Originated in 2021/2020	17	10			53	53
Originated in 2020/2019	8	10			27	56
Originated prior to 2020/2019	20	28			67	211
Revolving	444	328			1,327	885
Revolving converted to term						28
Total charge-offs	669	508			1,916	1,732
Commercial \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	10	22			13	29
Originated in 2023/2022	16	11			68	51
Originated in 2022/2021	48	17			132	25
Originated in 2021/2020	8	4			23	14
Originated in 2020/2019	3	4			9	11
Originated prior to 2020/2019	10	10			31	38
Revolving	70	42			208	115
Revolving converted to term						0
Total charge-offs	165	110			484	283
Commercial \| Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	39	20			80	20
Originated in 2023/2022	15	0			21	88
Originated in 2022/2021	23	27			47	44
Originated in 2021/2020	0	0			0	0
Originated in 2020/2019	1	0			1	3
Originated prior to 2020/2019	2	4			3	50
Revolving	0	0			0	0
Revolving converted to term						0
Total charge-offs	80	51			152	205
Financing receivable charge offs relating to uncollectible amount on acquired loans				$ 91
Consumer \| Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	0	0			0	0
Originated in 2023/2022	0	0			0	0
Originated in 2022/2021	1	0			2	5
Originated in 2021/2020	0	0			0	8
Originated in 2020/2019	0	0			0	16
Originated prior to 2020/2019	2	1			8	97
Revolving	0	0			0	0
Revolving converted to term						0
Total charge-offs	3	1			10	126
Financing receivables charge off relating to balance sheet repositioning and capital management actions			$ 117
Consumer \| Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	0	0			0	0
Originated in 2023/2022	0	0			0	0
Originated in 2022/2021	0	0			0	0
Originated in 2021/2020	0	0			0	0
Originated in 2020/2019	0	0			0	0
Originated prior to 2020/2019	0	0			0	0
Revolving	347	259			1,042	716
Revolving converted to term						0
Total charge-offs	347	259			1,042	716
Consumer \| Other retail
Financing Receivable, Credit Quality Indicator [Line Items]
Originated in 2024/2023	4	5			6	51
Originated in 2023/2022	13	17			34	116
Originated in 2022/2021	11	13			39	70
Originated in 2021/2020	9	6			30	31
Originated in 2020/2019	4	6			17	26
Originated prior to 2020/2019	6	13			25	26
Revolving	27	27			77	54
Revolving converted to term						28
Total charge-offs	$ 74	$ 87			$ 228	$ 402
Financing receivables charge off relating to balance sheet repositioning and capital management actions			$ 192

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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