Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	$ 3,429	$ 3,768
Fair Value Offset Amount	1,406	1,523
Cash Collateral	1,126	714
Derivative Asset, Net	897	1,531
Securities Collateral Held /Pledged Under Master Netting Agreements	66	34
Net Amounts	831	1,497
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	5,899	7,618
Fair Value Offset Amount	1,406	1,523
Cash Collateral	955	1,571
Derivative Liability, Net	3,538	4,524
Securities Collateral Held /Pledged Under Master Netting Agreements	58	82
Net Amounts	3,480	4,442
Commodity contracts
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	765	1,208
Fair Value Offset Amount	316	335
Cash Collateral	283	2
Derivative Asset, Net	166	871
Securities Collateral Held /Pledged Under Master Netting Agreements	5
Net Amounts	161	871
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	757	1,269
Fair Value Offset Amount	332	679
Cash Collateral		520
Derivative Liability, Net	425	70
Securities Collateral Held /Pledged Under Master Netting Agreements		4
Net Amounts	425	66
Foreign exchange and other contracts
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	307	437
Fair Value Offset Amount	114	214
Cash Collateral	76	82
Derivative Asset, Net	117	141
Net Amounts	117	141
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	494	520
Fair Value Offset Amount	189	219
Cash Collateral	13	10
Derivative Liability, Net	292	291
Net Amounts	292	291
Over-the-counter cleared | Interest rate contracts:
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	19	23
Derivative Asset, Net	19	23
Net Amounts	19	23
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	36	28
Derivative Liability, Net	36	28
Net Amounts	36	28
Over-the-counter | Interest rate contracts:
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	2,338	2,100
Fair Value Offset Amount	976	974
Cash Collateral	767	630
Derivative Asset, Net	595	496
Securities Collateral Held /Pledged Under Master Netting Agreements	61	34
Net Amounts	534	462
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Fair Value	4,612	5,801
Fair Value Offset Amount	885	625
Cash Collateral	942	1,041
Derivative Liability, Net	2,785	4,135
Securities Collateral Held /Pledged Under Master Netting Agreements	58	78
Net Amounts	$ 2,727	$ 4,057