Liabilities Subject to Compromise (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Liabilities Subject to Compromise [Abstract]
Liabilities subject to compromise, debt	$ 3,420
Liabilities subject to compromise, interest payable	99
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities	56
Liabilities Subject to Compromise, Environmental Contingencies	43
Liability Subject to Compromise, Pension and Other Postretirement Benefit Plan, Benefit Obligation	33
liabilities subject to compromise, dividend payable	13
Liabilities Subject to Compromise, Other Liabilities	8
Liabilities Subject to Compromise	$ 3,672	$ 0