Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

(In millions, except per share amounts)					Three Months Ended
	March 31,			June 30,			September 30,			December 31,
Consolidated Results
2017
Total revenues	$	10,385		$	10,318		$	10,382		$	10,531
Income before income taxes		890			1,134			824			758
Shareholders' net income		598	(1)		813	(1)		560	(1)		266	(1)
Shareholders' net income per share	1
Basic		2.34			3.20			2.25			1.09
Diluted		2.30			3.15			2.21			1.07
2016
Total revenues	$	9,884		$	9,960		$	9,880		$	9,944
Income before income taxes		819			813			742			605
Shareholders' net income		519	(1)		510	(1)		456	(1)		382	(1)
Shareholders' net income per share	1
Basic		2.04			2.00			1.79			1.49
Diluted		2.00			1.97			1.76			1.47
Stock and dividend data
2017
Price range of common stock — high	$	154.83		$	173.21		$	188.36		$	212.46
— low	$	133.52		$	146.70		$	166.81		$	183.08
Dividends declared per common share	$	0.04		$	-		$	-		$	-
2016
Price range of common stock — high	$	147.93		$	142.91		$	148.99		$	142.00
— low	$	123.54		$	121.87		$	123.53		$	115.03
Dividends declared per common share	$	0.04		$	-		$	-		$	-
(1) Shareholders' net income includes the following after-tax charges (benefits), described in Note 22 to the Consolidated Financial Statements:
	March 31,			June 30,			September 30,			December 31,
2017 U.S. tax reform	$	-		$	-		$	-		$	196
2017 Debt extinguishment costs		-			-			209			-
2017 Long-term care guaranty fund assessment		83			-			-			-
2017 Transaction-related costs		49			(47)			6			25
Total 2017 charges (benefits)	$	132		$	(47)		$	215		$	221
2016 Risk corridor allowance	$	-		$	-		$	-		$	80
2016 Transaction-related costs		36			26			46			39
2016 Charges associated with litigation matters		-			-			25			-
Total 2016 charges	$	36		$	26		$	71		$	119