Cash and Cash Equivalents and Restricted Cash and Cash Equivalents - PAC (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
Investments and restricted cash, cash equivalents and investments	19	21
Total cash and cash equivalents and restricted cash and cash equivalents	2,301	1,244	$ 1,500	$ 1,445
PAC
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	390	179
Restricted cash and cash equivalents	7	4
Investments and restricted cash, cash equivalents and investments	3	3
Total cash and cash equivalents and restricted cash and cash equivalents	$ 400	$ 186	$ 50	$ 19