Accounting for Derivative Instruments and Hedging Activities - Offsetting of Derivatives by Counterparty Master Agreement level and Collateral Received (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Gross Amounts of Recognized Assets / Liabilities	$ 3,553	$ 2,341
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(1,639)	(814)
Net Amount	1,914	1,527
Foreign exchange contract
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative Assets	18	1
Derivative Instruments	(2)	(1)
Cash Collateral (Held)/Posted	0	0
Net Amount	16	0
Derivative liabilities	(2)	(1)
Derivative Instruments	2	1
Cash Collateral (Held)/Posted	0	0
Net Amount	0	0
Gross Amounts of Recognized Assets / Liabilities	16	0
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	16	0
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative Assets	11,976	7,139
Derivative Instruments	(7,897)	(4,440)
Cash Collateral (Held)/Posted	(1,659)	(831)
Net Amount	2,420	1,868
Derivative liabilities	(8,439)	(4,798)
Derivative Instruments	7,897	4,440
Cash Collateral (Held)/Posted	20	17
Net Amount	(522)	(341)
Gross Amounts of Recognized Assets / Liabilities	3,537	2,341
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(1,639)	(814)
Net Amount	$ 1,898	$ 1,527