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Stock Compensation (Details) - USD ($)
$ / shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 01, 2019
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Effective Income Tax Rate Reconciliation, Percent 6.00% 8.00% (50.00%) 7.00% (46.00%)
Tax impact on reorganization adjustments $ 40        
Tax impact on fresh start adjustments $ (167)        
Share-based Compensation Arrangement by Share-based payment award, PSUs, Nonvested, Number   2,412,894      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture   $ 5      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   1,034,100      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   7,635,389      
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 29      
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 16