Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	$ 5,868	$ 5,152
Derivative Asset, Fair Value Offset Amount	1,774	928
Derivative asset, cash collateral	1,282	604
Derivative Asset, Net	2,812	3,620
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	35	300
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,777	3,320
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	9,737	3,570
Derivative liability, fair value offset amount	1,774	928
Derivative liability, cash collateral	2,572	1,657
Derivative liability, net	5,391	985
Derivative liability, fair value of collateral	79
Derivative liability, fair value, amount offset against collateral	5,312	985
Interest Rate Contracts | Over-the-counter cleared
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	140	20
Derivative Asset, Net	140	20
Derivative Asset, Fair Value, Amount Offset Against Collateral	140	20
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	244	12
Derivative liability, net	244	12
Derivative liability, fair value, amount offset against collateral	244	12
Interest Rate Contracts | Over-the-counter
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	2,176	3,561
Derivative Asset, Fair Value Offset Amount	873	533
Derivative asset, cash collateral	790	593
Derivative Asset, Net	513	2,435
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	35	300
Derivative Asset, Fair Value, Amount Offset Against Collateral	478	2,135
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	6,131	1,643
Derivative liability, fair value offset amount	550	569
Derivative liability, cash collateral	1,015	776
Derivative liability, net	4,566	298
Derivative liability, fair value of collateral	79
Derivative liability, fair value, amount offset against collateral	4,487	298
Commodity contracts:
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	2,575	1,363
Derivative Asset, Fair Value Offset Amount	555	299
Derivative asset, cash collateral	105	1
Derivative Asset, Net	1,915	1,063
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,915	1,063
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	2,673	1,373
Derivative liability, fair value offset amount	1,012	291
Derivative liability, cash collateral	1,548	784
Derivative liability, net	113	298
Derivative liability, fair value, amount offset against collateral	113	298
Foreign exchange contracts and other
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	977	208
Derivative Asset, Fair Value Offset Amount	346	96
Derivative asset, cash collateral	387	10
Derivative Asset, Net	244	102
Derivative Asset, Fair Value, Amount Offset Against Collateral	244	102
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	689	542
Derivative liability, fair value offset amount	212	68
Derivative liability, cash collateral	9	97
Derivative liability, net	468	377
Derivative liability, fair value, amount offset against collateral	$ 468	$ 377