Receivables, Net (Details) - USD ($) $ in Millions |
6 Months Ended | ||
|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Sep. 30, 2016 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Billed | $ 699 | $ 748 | |
| Unbilled | 505 | 439 | |
| Less progress payments | (63) | (87) | |
| Total | 1,141 | 1,100 | |
| Less allowance for doubtful accounts | (6) | (6) | |
| Receivables, net | 1,135 | 1,094 | |
| Receivables, net due from equity affiliates | 90 | $ 68 | |
| Net Cash Provided by Operating Activities, Continuing Operations | 1 | $ 45 | |
| Sales Under Factoring Agreements [Member] | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Net Cash Provided by Operating Activities, Continuing Operations | $ 136 | $ 9 | |