Derivative Instruments and Hedging Activities - Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Derivative assets:
Total derivative assets — gross	$ 772	$ 2,418	$ 1,156
Gross amounts offset in the balance sheet	(239)	(295)	(116)
Cash collateral received	(108)	(398)	(205)
Total derivative assets — net	425	1,725	835
Derivative liabilities:
Total derivative liabilities — gross	(453)	(515)	(202)
Gross amounts offset in the balance sheet	239	295	116
Cash collateral pledged	45	7	0
Total derivative liabilities — net	(169)	(213)	(86)
Commodity contracts
Derivative assets:
Total derivative assets — gross	18	31	10
Derivative liabilities:
Total derivative liabilities — gross	(35)	(26)	(7)
Derivatives designated as hedging instruments:
Derivative assets:
Total derivative assets — gross	74	123	15
Derivative liabilities:
Total derivative liabilities — gross	0	0	(20)
Derivatives designated as hedging instruments: | Foreign currency contracts
Derivative assets:
Total derivative assets — gross	11	57	10
Derivative liabilities:
Total derivative liabilities — gross	0	0	(3)
Derivatives designated as hedging instruments: | Interest rate contracts
Derivative assets:
Total derivative assets — gross	63	66	5
Derivative liabilities:
Total derivative liabilities — gross	0	0	(17)
Derivatives not designated as hedging instruments:
Derivative assets:
Total derivative assets — gross	680	2,264	1,131
Derivative liabilities:
Total derivative liabilities — gross	(418)	(489)	(175)
Derivatives not designated as hedging instruments: | Foreign currency contracts
Derivative assets:
Total derivative assets — gross	24	62	19
Derivative liabilities:
Total derivative liabilities — gross	(4)	(2)	(4)
Derivatives not designated as hedging instruments: | Commodity contracts
Derivative assets:
Total derivative assets — gross	656	2,202	1,112
Derivative liabilities:
Total derivative liabilities — gross	$ (414)	$ (487)	$ (171)