CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 413	$ 520
Accounts receivable—trade, net	977	932
Accounts receivable—other	149	175
Contracts in progress	1,006	704
Other current assets	148	139
Accounts payable	949	595
Advance billings on contracts	1,618	1,954
Accrued liabilities, current	$ 1,694	$ 1,564
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	255,000,000	255,000,000
Common stock, shares issued	184,000,000	183,000,000
Treasury stock, shares	3,000,000	3,000,000
Variable Interest Entities ("VIEs") [Member]
Cash and cash equivalents	$ 142	$ 146
Accounts receivable—trade, net	15	29
Accounts receivable—other	49	57
Contracts in progress	245	144
Other current assets	29	24
Accounts payable	326	277
Advance billings on contracts	541	717
Accrued liabilities, current	$ 94	$ 136