Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	$ 5,392	$ 5,152
Derivative Asset, Fair Value Offset Amount	1,577	928
Derivative asset, cash collateral	578	604
Derivative Asset, Net	3,237	3,620
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	23	300
Derivative Asset, Fair Value, Amount Offset Against Collateral	3,214	3,320
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	7,590	3,570
Derivative liability, fair value offset amount	1,577	928
Derivative liability, cash collateral	2,288	1,657
Derivative liability, net	3,725	985
Derivative liability, fair value of collateral
Derivative liability, fair value, amount offset against collateral	3,725	985
Interest Rate Contracts | Over-the-counter cleared
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	43	20
Derivative Asset, Net	43	20
Derivative Asset, Fair Value, Amount Offset Against Collateral	43	20
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	28	12
Derivative liability, net	28	12
Derivative liability, fair value, amount offset against collateral	28	12
Interest Rate Contracts | Over-the-counter
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	1,693	3,561
Derivative Asset, Fair Value Offset Amount	634	533
Derivative asset, cash collateral	318	593
Derivative Asset, Net	741	2,435
Derivative Asset, Securities Collateral Held Under Master Netting Agreements	23	300
Derivative Asset, Fair Value, Amount Offset Against Collateral	718	2,135
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	3,787	1,643
Derivative liability, fair value offset amount	680	569
Derivative liability, cash collateral	761	776
Derivative liability, net	2,346	298
Derivative liability, fair value, amount offset against collateral	2,346	298
Commodity contracts:
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	3,134	1,363
Derivative Asset, Fair Value Offset Amount	676	299
Derivative asset, cash collateral	138	1
Derivative Asset, Net	2,320	1,063
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,320	1,063
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	3,230	1,373
Derivative liability, fair value offset amount	802	291
Derivative liability, cash collateral	1,513	784
Derivative liability, net	915	298
Derivative liability, fair value, amount offset against collateral	915	298
Foreign exchange contracts and other
Offsetting Derivative Assets [Abstract]
Derivative asset, gross fair value	522	208
Derivative Asset, Fair Value Offset Amount	267	96
Derivative asset, cash collateral	122	10
Derivative Asset, Net	133	102
Derivative Asset, Fair Value, Amount Offset Against Collateral	133	102
Offsetting Derivative Liabilities [Abstract]
Derivative liability, gross fair value	545	542
Derivative liability, fair value offset amount	95	68
Derivative liability, cash collateral	14	97
Derivative liability, net	436	377
Derivative liability, fair value, amount offset against collateral	$ 436	$ 377