Consolidated Statements of Cash Flows $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Cash flows from operating activities:
Net income	$ 209	$ 310	$ 440
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	104	63	48
Equity in earnings of unconsolidated affiliates	(35)	(79)	(70)
Deferred income tax (benefit) expense	(14)	26	(322)
Loss (gain) on disposition of assets	(17)	2	(5)
Gain on consolidation of Aspire subcontracting entities	0	(108)	0
Other	34	24	29
Changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable, net of allowance for doubtful accounts	(16)	(203)	92
Contract assets	(31)	25	40
Claims receivable	39	3	430
Accounts payable	23	112	(193)
Contract liabilities	19	(60)	(198)
Accrued salaries, wages and benefits	(9)	11	14
Payments from (advances to) unconsolidated affiliates, net	10	12	11
Distributions of earnings from unconsolidated affiliates	69	75	62
Pension funding	(45)	(41)	(37)
Other assets and liabilities	(84)	(7)	(148)
Total cash flows provided by operating activities	256	165	193
Cash flows from investing activities:
Purchases of property, plant and equipment	(20)	(17)	(8)
Investments in equity method joint ventures	(146)	(344)	0
Proceeds from sale of assets or investments	9	25	2
Acquisitions of businesses, net of cash acquired	0	(354)	(4)
Adjustments to cash due to consolidation of Aspire entities	0	197	0
Other	(1)	2	(2)
Total cash flows used in investing activities	(158)	(491)	(12)
Cash flows from financing activities:
Payments to reacquire common stock	(4)	(3)	(53)
Acquisition of remaining ownership interest in joint ventures	0	(56)	0
Investments from noncontrolling interests	1	0	1
Distributions to noncontrolling interests	(14)	(3)	(4)
Payments of dividends to shareholders	(46)	(44)	(45)
Proceeds from sale of warrants	0	22	0
Purchase of note hedges	0	(62)	0
Issuance of convertible notes	0	350	0
Net proceeds from issuance of common stock	5	2	0
Excess tax benefits from share-based compensation	0	1	0
Borrowings on revolving credit agreement	0	250	0
Borrowings on long term debt	0	1,075	0
Payments on revolving credit agreement	0	(720)	(180)
Payments on short-term and long-term borrowings	(70)	(100)	(9)
Debt issuance costs	0	(57)	0
Other	(5)	(1)	0
Total cash flows provided (used) by financing activities	(133)	654	(290)
Effect of exchange rate changes on cash	8	(28)	12
Increase (decrease) in cash and equivalents	(27)	300	(97)
Cash and equivalents at beginning of period	739	439	536
Cash and equivalents at end of period	712	739	439
Supplemental disclosure of cash flows information:
Cash paid for interest	80	52	21
Cash paid for income taxes (net of refunds)	54	21	144
Noncash investing activities
Acquisition of technology licensing rights	0	16	0
Noncash financing activities
Dividends declared	$ 11	$ 11	$ 11