CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of cash, cash equivalents and restricted cash and cash equivalents at end of period
Cash and cash equivalents	$ 52	$ 30
Restricted cash and cash equivalents included in restricted trust and escrow accounts	374	64
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 426	$ 94