CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019		Dec. 31, 2018
Cash and cash equivalents	$ 677		$ 520
Accounts receivable—trade, net	935		932
Accounts receivable—other	209		175
Contracts in progress	1,063		704
Other current assets	149		139
Accounts payable	1,421		595
Advance billings on contracts	1,359		1,954
Accrued liabilities, current	$ 1,517		$ 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	[1]	183,000,000
Treasury stock, shares	3,000,000		3,000,000
Variable Interest Entities ("VIEs") [Member]
Cash and cash equivalents	$ 256		$ 146
Accounts receivable—trade, net	107		29
Accounts receivable—other	36		57
Contracts in progress	223		144
Other current assets	32		24
Accounts payable	322		277
Advance billings on contracts	497		717
Accrued liabilities, current	$ 66		$ 136

[1] ^{Amounts in this table may not sum due to rounding.}