CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 455	$ 520
Accounts receivable—trade, net	1,002	932
Accounts receivable—other	235	175
Contracts in progress	932	704
Other current assets	152	139
Accounts payable	1,206	595
Advance billings on contracts	1,438	1,954
Accrued liabilities, current	$ 1,467	$ 1,564
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	255,000,000	255,000,000
Common stock, shares issued	185,000,000	183,000,000
Treasury stock, shares	3,000,000	3,000,000
Variable Interest Entities ("VIEs") [Member]
Cash and cash equivalents	$ 252	$ 146
Accounts receivable—trade, net	45	29
Accounts receivable—other	61	57
Contracts in progress	167	144
Other current assets	31	24
Accounts payable	307	277
Advance billings on contracts	389	717
Accrued liabilities, current	$ 76	$ 136