Loans and Allowance for Credit Losses - Amortized Cost Basis (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 4,071,000,000		$ 5,839,000,000
2022	3,039,000,000		5,104,000,000
2021	4,944,000,000		512,000,000
2020	459,000,000		1,636,000,000
2019	1,642,000,000		1,092,000,000
Prior	1,679,000,000		668,000,000
Revolving Loans	18,070,000,000		17,294,000,000
Loans, gross, excluding loans classified as held-for-sale	33,904,000,000		32,145,000,000
Financing receivable, accrued interest, before allowance for credit loss	268,000,000		200,000,000
Financing receivable, held-for-sale	12,000,000		5,000,000
Provision for credit losses	44,000,000	$ 0
Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	29,229,000,000		27,176,000,000
Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	4,058,000,000		4,491,000,000
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	443,000,000		379,000,000
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	129,000,000		99,000,000
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	45,000,000
Commercial and Financial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	31,003,000,000		29,160,000,000
Commercial and Financial | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	27,003,000,000		24,667,000,000
Commercial and Financial | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	3,516,000,000		4,103,000,000
Commercial and Financial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	355,000,000		291,000,000
Commercial and Financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	129,000,000		99,000,000
Commercial and Financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	0
Commercial and Financial | Domestic
Financing Receivable, Credit Quality Indicator [Line Items]
2023	2,463,000,000		2,100,000,000
2022	383,000,000		1,164,000,000
2021	1,085,000,000		245,000,000
2020	204,000,000		908,000,000
2019	907,000,000		286,000,000
Prior	372,000,000		167,000,000
Revolving Loans	13,557,000,000		13,388,000,000
Loans, gross, excluding loans classified as held-for-sale	18,971,000,000		18,258,000,000
Commercial and Financial | Domestic | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	2,341,000,000		1,577,000,000
2022	161,000,000		185,000,000
2021	185,000,000		72,000,000
2020	66,000,000		300,000,000
2019	300,000,000		0
Prior	7,000,000		9,000,000
Revolving Loans	13,088,000,000		12,843,000,000
Loans, gross, excluding loans classified as held-for-sale	16,148,000,000		14,986,000,000
Commercial and Financial | Domestic | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
2023	117,000,000		523,000,000
2022	218,000,000		859,000,000
2021	710,000,000		168,000,000
2020	133,000,000		461,000,000
2019	436,000,000		236,000,000
Prior	327,000,000		151,000,000
Revolving Loans	469,000,000		545,000,000
Loans, gross, excluding loans classified as held-for-sale	2,410,000,000		2,943,000,000
Commercial and Financial | Domestic | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	5,000,000		0
2022	4,000,000		120,000,000
2021	160,000,000		0
2020	0		105,000,000
2019	129,000,000		19,000,000
Prior	0		0
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	298,000,000		244,000,000
Commercial and Financial | Domestic | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		0
2022	0		0
2021	30,000,000		5,000,000
2020	5,000,000		42,000,000
2019	42,000,000		31,000,000
Prior	38,000,000		7,000,000
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	115,000,000		85,000,000
Commercial and Financial | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1,608,000,000		3,220,000,000
2022	2,136,000,000		3,328,000,000
2021	3,331,000,000		118,000,000
2020	105,000,000		186,000,000
2019	194,000,000		144,000,000
Prior	145,000,000		0
Revolving Loans	4,513,000,000		3,906,000,000
Loans, gross, excluding loans classified as held-for-sale	12,032,000,000		10,902,000,000
Commercial and Financial | Non-U.S. | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1,534,000,000		2,986,000,000
2022	1,993,000,000		2,799,000,000
2021	2,815,000,000		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	4,513,000,000		3,897,000,000
Loans, gross, excluding loans classified as held-for-sale	10,855,000,000		9,682,000,000
Commercial and Financial | Non-U.S. | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
2023	74,000,000		234,000,000
2022	143,000,000		529,000,000
2021	516,000,000		100,000,000
2020	76,000,000		181,000,000
2019	189,000,000		107,000,000
Prior	108,000,000		0
Revolving Loans	0		9,000,000
Loans, gross, excluding loans classified as held-for-sale	1,106,000,000		1,160,000,000
Commercial and Financial | Non-U.S. | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		0
2022	0		0
2021	0		18,000,000
2020	29,000,000		5,000,000
2019	5,000,000		23,000,000
Prior	23,000,000		0
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	57,000,000		46,000,000
Commercial and Financial | Non-U.S. | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		14,000,000
Prior	14,000,000		0
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	14,000,000		14,000,000
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	2,901,000,000		2,985,000,000
Commercial real estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	2,226,000,000		2,509,000,000
Commercial real estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	542,000,000		388,000,000
Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	88,000,000		88,000,000
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	0		0
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross, excluding loans classified as held-for-sale	45,000,000
Commercial real estate | Domestic
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		519,000,000
2022	520,000,000		612,000,000
2021	528,000,000		149,000,000
2020	150,000,000		542,000,000
2019	541,000,000		662,000,000
Prior	1,162,000,000		501,000,000
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	2,901,000,000		2,985,000,000
Commercial real estate | Domestic | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		519,000,000
2022	520,000,000		612,000,000
2021	528,000,000		100,000,000
2020	100,000,000		330,000,000
2019	330,000,000		511,000,000
Prior	748,000,000		436,000,000
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	2,226,000,000		2,508,000,000
Commercial real estate | Domestic | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		0
2022	0		0
2021	0		49,000,000
2020	50,000,000		163,000,000
2019	163,000,000		111,000,000
Prior	329,000,000		65,000,000
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	542,000,000		388,000,000
Commercial real estate | Domestic | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0		0
2022	0		0
2021	0		0
2020	0		49,000,000
2019	48,000,000		40,000,000
Prior	40,000,000		0
Revolving Loans	0		0
Loans, gross, excluding loans classified as held-for-sale	88,000,000		$ 89,000,000
Commercial real estate | Domestic | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	45,000,000
Revolving Loans	0
Loans, gross, excluding loans classified as held-for-sale	$ 45,000,000