Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Amount
Total available-for-sale securities	[1]	$ 29,541	$ 33,587
Due in one year or less		125	370
Due after one year through five years		2,229	1,905
Due after five years through ten years		3,476	4,324
Due after ten years		$ 23,711	$ 26,988
Yield
Total		2.50%	2.30%
Due in one year or less		2.30%	1.30%
Due after one year through five years		1.90%	1.90%
Due after five years through ten years		2.10%	2.00%
Due after ten years		2.60%	2.40%
Amortized cost of available-for-sale securities
Total		$ 34,863	$ 33,650
Due in one year or less		126	368
Due after one year through five years		2,403	1,893
Due after five years through ten years		4,048	4,291
Due after ten years		28,286	27,098
Amount
Total		1,062	1,170
Due in one year or less		0	0
Due after one year through five years		0	0
Due after five years through ten years		0	0
Due after ten years		$ 1,062	$ 1,170
Yield
Total		2.80%	2.80%
Due in one year or less		0.00%	0.00%
Due after one year through five years		0.00%	0.00%
Due after five years through ten years		0.00%	0.00%
Due after ten years		2.80%	2.80%
Hedged liability, fair value hedge, cumulative increase (decrease)		$ (12)
Hedged asset, fair value hedge, cumulative increase (decrease)		15
Cash equivalents		18	$ 40
U.S. Treasury and federal agencies
Amount
Total available-for-sale securities		2,016	2,155
Due in one year or less		0	288
Due after one year through five years		716	525
Due after five years through ten years		1,300	1,342
Due after ten years		$ 0	$ 0
Yield
Total		1.60%	1.10%
Due in one year or less		0.00%	1.00%
Due after one year through five years		1.30%	0.90%
Due after five years through ten years		1.70%	1.20%
Due after ten years		0.00%	0.00%
Amortized cost of available-for-sale securities
Total		$ 2,272	$ 2,173
U.S. States and political subdivisions
Amount
Total available-for-sale securities		760	864
Due in one year or less		26	26
Due after one year through five years		60	77
Due after five years through ten years		112	128
Due after ten years		$ 562	$ 633
Yield
Total		3.20%	3.00%
Due in one year or less		2.70%	1.60%
Due after one year through five years		2.70%	2.80%
Due after five years through ten years		3.30%	3.30%
Due after ten years		3.20%	3.00%
Amortized cost of available-for-sale securities
Total		$ 841	$ 841
Foreign government
Amount
Total available-for-sale securities		146	157
Due in one year or less		13	2
Due after one year through five years		74	97
Due after five years through ten years		59	58
Due after ten years		$ 0	$ 0
Yield
Total		1.80%	1.90%
Due in one year or less		0.80%	2.10%
Due after one year through five years		1.80%	2.00%
Due after five years through ten years		1.90%	1.80%
Due after ten years		0.00%	0.00%
Amortized cost of available-for-sale securities
Total		$ 158	$ 157
Agency mortgage-backed security
Amount
Total available-for-sale securities		16,633	19,039
Due in one year or less		0	0
Due after one year through five years		0	0
Due after five years through ten years		27	26
Due after ten years		$ 16,606	$ 19,013
Yield
Total		2.60%	2.50%
Due in one year or less		0.00%	0.00%
Due after one year through five years		0.00%	0.00%
Due after five years through ten years		2.00%	2.00%
Due after ten years		2.60%	2.50%
Amortized cost of available-for-sale securities
Total		$ 19,668	$ 19,044
Amount
Total		1,062	1,170
Due in one year or less		0	0
Due after one year through five years		0	0
Due after five years through ten years		0	0
Due after ten years		$ 1,062	$ 1,170
Yield
Total		2.80%	2.80%
Due in one year or less		0.00%	0.00%
Due after one year through five years		0.00%	0.00%
Due after five years through ten years		0.00%	0.00%
Due after ten years		2.80%	2.80%
Mortgage-backed residential
Amount
Total available-for-sale securities		$ 4,299	$ 4,425
Due in one year or less		0	0
Due after one year through five years		0	0
Due after five years through ten years		14	23
Due after ten years		$ 4,285	$ 4,402
Yield
Total		2.80%	2.60%
Due in one year or less		0.00%	0.00%
Due after one year through five years		0.00%	0.00%
Due after five years through ten years		2.90%	2.90%
Due after ten years		2.80%	2.60%
Amortized cost of available-for-sale securities
Total		$ 5,154	$ 4,448
Agency mortgage-backed commercial
Amount
Total available-for-sale securities		3,535	4,526
Due in one year or less		0	0
Due after one year through five years		66	26
Due after five years through ten years		1,234	1,578
Due after ten years		$ 2,235	$ 2,922
Yield
Total		2.20%	1.90%
Due in one year or less		0.00%	0.00%
Due after one year through five years		3.10%	2.40%
Due after five years through ten years		2.10%	2.40%
Due after ten years		2.10%	1.70%
Amortized cost of available-for-sale securities
Total		$ 4,380	$ 4,573
Asset-backed
Amount
Total available-for-sale securities		433	534
Due in one year or less		0	0
Due after one year through five years		401	350
Due after five years through ten years		25	175
Due after ten years		$ 7	$ 9
Yield
Total		1.70%	1.90%
Due in one year or less		0.00%	0.00%
Due after one year through five years		1.70%	2.00%
Due after five years through ten years		1.80%	1.50%
Due after ten years		3.50%	3.40%
Amortized cost of available-for-sale securities
Total		$ 459	$ 536
Corporate debt
Amount
Total available-for-sale securities		1,719	1,887
Due in one year or less		86	54
Due after one year through five years		912	830
Due after five years through ten years		705	994
Due after ten years		$ 16	$ 9
Yield
Total		2.40%	2.30%
Due in one year or less		2.40%	2.90%
Due after one year through five years		2.30%	2.30%
Due after five years through ten years		2.60%	2.30%
Due after ten years		4.90%	2.50%
Amortized cost of available-for-sale securities
Total		$ 1,931	$ 1,878

[1] Refer to Note 8 for discussion of investment securities pledged as collateral.