Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	$ 5,152	$ 6,533
Fair Value Offset Amount	928	720
Cash Collateral	604	1,434
Net Fair Value	3,620	4,379
Securities Collateral Held /Pledged Under Master Netting Agreements	300	532
Net Amounts	3,320	3,847
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	3,570	2,756
Fair Value Offset Amount	928	720
Cash Collateral	1,657	1,452
Net Fair Value	985	584
Net Amounts	985	584
Commodity contracts
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	1,363	411
Fair Value Offset Amount	299	209
Cash Collateral	1	4
Net Fair Value	1,063	198
Net Amounts	1,063	198
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	1,373	384
Fair Value Offset Amount	291	182
Cash Collateral	784	103
Net Fair Value	298	99
Net Amounts	298	99
Foreign exchange and other contracts
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	208	271
Fair Value Offset Amount	96	81
Cash Collateral	10	4
Net Fair Value	102	186
Securities Collateral Held /Pledged Under Master Netting Agreements		1
Net Amounts	102	185
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	542	590
Fair Value Offset Amount	68	76
Cash Collateral	97	170
Net Fair Value	377	344
Net Amounts	377	344
Over-the-counter cleared | Interest rate contracts:
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	20	48
Net Fair Value	20	48
Net Amounts	20	48
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	12	42
Net Fair Value	12	42
Net Amounts	12	42
Over-the-counter | Interest rate contracts:
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	3,561	5,803
Fair Value Offset Amount	533	430
Cash Collateral	593	1,426
Net Fair Value	2,435	3,947
Securities Collateral Held /Pledged Under Master Netting Agreements	300	531
Net Amounts	2,135	3,416
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	1,643	1,740
Fair Value Offset Amount	569	462
Cash Collateral	776	1,179
Net Fair Value	298	99
Net Amounts	$ 298	$ 99