Segment Information (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents segment revenue and segment operating income for our reportable segments for the three months ended June 30, 2019 and 2018.

	Three Months Ended June 30,
	HCB				CRB				IRR				BDA						Total
	2019		2018		2019		2018		2019		2018		2019			2018			2019		2018
Segment revenue	$	797	$	780	$	690	$	674	$	409	$	385	$	126		$	119		$	2,022	$	1,958
Segment operating    income/(loss)	$	169	$	149	$	104	$	97	$	109	$	89	$	(25	)	$	(31	)	$	357	$	304

The following table presents segment revenue and segment operating income for our reportable segments for the six months ended June 30, 2019 and 2018.

	Six Months Ended June 30,
	HCB				CRB				IRR				BDA						Total
	2019		2018		2019		2018		2019		2018		2019			2018			2019		2018
Segment revenue	$	1,626	$	1,612	$	1,418	$	1,414	$	998	$	959	$	261		$	241		$	4,303	$	4,226
Segment operating    income/(loss)	$	373	$	342	$	231	$	222	$	361	$	350	$	(46	)	$	(63	)	$	919	$	851

Net Operating Income of the Reported Segments

The following table presents reconciliations of the information reported by segment to the Company’s condensed consolidated statement of comprehensive income amounts reported for the three and six months ended June 30, 2019 and 2018.

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Revenue:
Total segment revenue	$	2,022		$	1,958		$	4,303		$	4,226
Reimbursable expenses and other		26			32			57			56
Revenue	$	2,048		$	1,990		$	4,360		$	4,282
Total segment operating income	$	357		$	304		$	919		$	851
Amortization		(123	)		(140	)		(250	)		(281	)
Transaction and integration expenses		—			(55	)		(6	)		(98	)
Unallocated, net (i)		(58	)		(46	)		(128	)		(150	)
Income from operations		176			63			535			322
Interest expense		(56	)		(52	)		(110	)		(103	)
Other income, net		67			63			122			119
Income from operations before income taxes	$	187		$	74		$	547		$	338