Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Summary of Quarterly Financial Results

The following tables summarize supplementary quarterly financial information:

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
2016
Total revenue	$	2,075	$	2,292	$	2,499	$	2,692
Income before income taxes	$	225	$	266	$	228	$	194
Net income	$	164	$	189	$	147	$	254
2015
Total revenue	$	1,354	$	1,515	$	1,707	$	1,878
Income before income taxes	$	214	$	225	$	231	$	167
Net income	$	150	$	186	$	179	$	131