Summary of Significant Accounting Policies - Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents			$ 607
Short-term restricted cash and cash equivalents	$ 531	$ 6,149	1,035
Long-term restricted cash and cash equivalents	340	405	398
Cash and cash equivalent margin deposits and guaranty funds	78,980	141,990	145,936
Total	$ 80,750	$ 150,343	$ 147,976	$ 83,619