Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quartertly Financial Data [Abstract]

(Millions, except per share amounts)			2015								2014
Quarters Ended				12/31		9/30		6/30		3/31		12/31		9/30		6/30		3/31
Total revenues net of interest expense			$	8,391	$	8,193	$	8,284	$	7,950	$	9,081	$	8,303	$	8,631	$	8,173
Pretax income				1,454		1,938		2,230		2,316		2,225		2,246		2,312		2,208
Net income				899		1,266		1,473		1,525		1,447		1,477		1,529		1,432
Earnings Per Common Share — Basic:
	Net income attributable to common
		shareholders^(a)	$	0.89	$	1.24	$	1.43	$	1.49	$	1.40	$	1.41	$	1.44	$	1.34
Earnings Per Common Share — Diluted:
	Net income attributable to common
		shareholders^(a)		0.89		1.24		1.42		1.48		1.39		1.40		1.43		1.33
Cash dividends declared per common share				0.29		0.29		0.29		0.26		0.26		0.26		0.26		0.23
Common share price:
		High		77.85		81.66		81.92		93.94		94.89		96.24		96.04		94.35
		Low	$	67.57	$	71.71	$	76.53	$	77.12	$	78.41	$	85.75	$	83.99	$	82.63

Represents net income, less (i) earnings allocated to participating share awards of $6 million, $10 million, $11 million and $11 million for the quarters ended December 31, September 30, June 30 and March 31, 2015, respectively, and $11 million, $11 million, $12 million and $12 million for the quarters ended December 31, September 30, June 30 and March 31, 2014, respectively, and (ii) dividends on preferred shares of $20 million, $22 million and $20 million, for the quarters ended December 31, September 30 and June 30, 2015, respectively, and nil for all other comparative periods.