Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - MEC (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,081	$ 1,096
Restricted cash and cash equivalents	201	127
Total cash and cash equivalents and restricted cash and cash equivalents	2,301	1,244	$ 1,500	$ 1,445
MEC
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	495	232
Restricted cash and cash equivalents	8	7
Total cash and cash equivalents and restricted cash and cash equivalents	$ 503	$ 239	$ 38	$ 45