Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative assets
Gross Fair Value	$ 3,308	$ 3,429
Fair Value Offset Amount	1,431	1,406
Cash Collateral	761	1,126
Derivative assets, Net Fair Value	1,116	897
Securities Collateral Held/Pledged Under Master Netting Agreements	2	66
Net Amounts	1,114	831
Derivative liabilities
Gross Fair Value	4,627	5,899
Fair Value Offset Amount	1,431	1,406
Cash Collateral	836	955
Derivative liabilities, Net Fair Value	2,360	3,538
Securities Collateral Held/Pledged Under Master Netting Agreements	40	58
Net Amounts	2,320	3,480
Interest rate contracts | Over-the-counter cleared
Derivative assets
Gross Fair Value	11	19
Derivative assets, Net Fair Value	11	19
Net Amounts	11	19
Derivative liabilities
Gross Fair Value	16	36
Derivative liabilities, Net Fair Value	16	36
Net Amounts	16	36
Interest rate contracts | Over-the-counter
Derivative assets
Gross Fair Value	2,339	2,338
Fair Value Offset Amount	944	976
Cash Collateral	599	767
Derivative assets, Net Fair Value	796	595
Securities Collateral Held/Pledged Under Master Netting Agreements	1	61
Net Amounts	795	534
Derivative liabilities
Gross Fair Value	3,345	4,612
Fair Value Offset Amount	871	885
Cash Collateral	785	942
Derivative liabilities, Net Fair Value	1,689	2,785
Securities Collateral Held/Pledged Under Master Netting Agreements	40	58
Net Amounts	1,649	2,727
Commodity contracts:
Derivative assets
Gross Fair Value	622	765
Fair Value Offset Amount	370	316
Cash Collateral	137	283
Derivative assets, Net Fair Value	115	166
Securities Collateral Held/Pledged Under Master Netting Agreements	1	5
Net Amounts	114	161
Derivative liabilities
Gross Fair Value	598	757
Fair Value Offset Amount	345	332
Cash Collateral	8
Derivative liabilities, Net Fair Value	245	425
Net Amounts	245	425
Foreign exchange contracts and other
Derivative assets
Gross Fair Value	336	307
Fair Value Offset Amount	117	114
Cash Collateral	25	76
Derivative assets, Net Fair Value	194	117
Net Amounts	194	117
Derivative liabilities
Gross Fair Value	668	494
Fair Value Offset Amount	215	189
Cash Collateral	43	13
Derivative liabilities, Net Fair Value	410	292
Net Amounts	$ 410	$ 292