Quarterly Financial Data Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	2017								2016
	12/31		9/30		6/30		3/31		12/31		9/30		6/30		3/31
	(in millions, except per share data)
Net revenues	$	3,160	$	2,981	$	2,985	$	2,901	$	3,062	$	2,998	$	2,871	$	2,765
Pretax income	600		628		511		475		469		238		410		475
Net income	181		503		393		403		400		215		335		364
Earnings per share:
Basic	$	1.20	$	3.29	$	2.53	$	2.56	$	2.49	$	1.31	$	1.99	$	2.11
Diluted	$	1.18	$	3.24	$	2.50	$	2.52	$	2.46	$	1.30	$	1.97	$	2.09
Weighted average common shares outstanding:
Basic	151.0		153.0		155.1		157.5		160.4		164.0		168.3		172.6
Diluted	153.8		155.4		157.5		160.1		162.4		165.8		170.1		174.4
Cash dividends declared per common share	$	0.83	$	0.83	$	0.83	$	0.75	$	0.75	$	0.75	$	0.75	$	0.67
Common share price:
High	173.62		149.99		133.02		135.20		119.32		101.81		102.74		105.47
Low	147.79		128.06		118.84		110.56		86.25		84.93		84.92		76.00