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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents at end of period:      
Cash and cash equivalents $ 118 $ 553 $ 3,561
Restricted cash and cash equivalents included in other current assets 7 28 15
Restricted cash and cash equivalents included in restricted trust and escrow accounts 69 67 71
Cash, cash equivalents and restricted cash and cash equivalents at end of period $ 194 $ 648 $ 3,647