XML 92 R66.htm IDEA: XBRL DOCUMENT v3.22.0.1
Fair Value Measurements - Schedule of Change in Restricted Investments Valued Using Level 3 Inputs (Details) - Level 3 - Fair Value Recurring Basis - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other Liabilities    
Fair Value, Liabilities    
Fair value of investment and liabilities, beginning balance $ 0 $ 0
Value of additional investment received   2
Released from restrictions 0 (4)
Unrealized gain   2
Change in fair value 0  
Fair value of investment and liabilities, ending balance 0 0
Restricted Investments    
Fair Value, Assets    
Fair value of investment and liabilities, beginning balance 44 29
Value of additional investment received   5
Released from restrictions 51 (8)
Unrealized gain   18
Change in fair value 7  
Fair value of investment and liabilities, ending balance $ 0 $ 44