Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative assets
Gross Fair Value	$ 3,074	$ 3,011
Fair Value Offset Amount	1,458	1,298
Cash Collateral	504	897
Derivative assets, Net Fair Value	1,112	816
Securities Collateral Held/Pledged Under Master Netting Agreements	47	45
Net Amounts	1,065	771
Derivative liabilities
Gross Fair Value	4,730	5,495
Fair Value Offset Amount	1,458	1,298
Cash Collateral	897	1,029
Derivative liabilities, Net Fair Value	2,375	3,168
Securities Collateral Held/Pledged Under Master Netting Agreements	44	57
Net Amounts	2,331	3,111
Interest rate contracts | Over-the-counter cleared
Derivative assets
Gross Fair Value	21	35
Derivative assets, Net Fair Value	21	35
Net Amounts	21	35
Derivative liabilities
Gross Fair Value	22	17
Derivative liabilities, Net Fair Value	22	17
Net Amounts	22	17
Interest rate contracts | Over-the-counter
Derivative assets
Gross Fair Value	1,926	1,894
Fair Value Offset Amount	990	843
Cash Collateral	439	629
Derivative assets, Net Fair Value	497	422
Securities Collateral Held/Pledged Under Master Netting Agreements	47	38
Net Amounts	450	384
Derivative liabilities
Gross Fair Value	3,466	4,469
Fair Value Offset Amount	769	732
Cash Collateral	831	1,019
Derivative liabilities, Net Fair Value	1,866	2,718
Securities Collateral Held/Pledged Under Master Netting Agreements	44	57
Net Amounts	1,822	2,661
Commodity contracts:
Derivative assets
Gross Fair Value	786	521
Fair Value Offset Amount	332	296
Cash Collateral	21	85
Derivative assets, Net Fair Value	433	140
Securities Collateral Held/Pledged Under Master Netting Agreements	0	5
Net Amounts	433	135
Derivative liabilities
Gross Fair Value	762	496
Fair Value Offset Amount	506	393
Cash Collateral	53	2
Derivative liabilities, Net Fair Value	203	101
Securities Collateral Held/Pledged Under Master Netting Agreements	0	0
Net Amounts	203	101
Foreign exchange contracts and other
Derivative assets
Gross Fair Value	341	561
Fair Value Offset Amount	136	159
Cash Collateral	44	183
Derivative assets, Net Fair Value	161	219
Securities Collateral Held/Pledged Under Master Netting Agreements	0	2
Net Amounts	161	217
Derivative liabilities
Gross Fair Value	480	513
Fair Value Offset Amount	183	173
Cash Collateral	13	8
Derivative liabilities, Net Fair Value	284	332
Securities Collateral Held/Pledged Under Master Netting Agreements	0	0
Net Amounts	$ 284	$ 332