CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents at end of period
Cash and cash equivalents	$ 83	$ 35
Restricted cash and cash equivalents included in restricted trust and escrow accounts	347	67
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 430	$ 102