Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common equities	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2015		$ 397	$ 1,232	$ 4,762	$ 1,344	$ (1,308)
Share-based awards		0	(10)			23
Share-based compensation			13
Other			2			2
Net Income	$ 311			311
Dividends declared				(158)
Other comprehensive income	370				370
Shares acquired - share repurchase authorization						(2)
Shares acquired - share-based compensation plans						(7)
Ending Balance at Jun. 30, 2016	6,971	$ 397	1,237	4,915	1,714	(1,292)
Beginning Balance (in shares) at Dec. 31, 2015		163.9
Share-based awards (in shares)		0.7
Shares acquired - share repurchase authorization (in shares)		0.0
Shares acquired - share-based compensation plans (in shares)		(0.1)
Ending Balance (in shares) at Jun. 30, 2016		164.5
Beginning Balance at Dec. 31, 2016	7,060	$ 397	1,252	5,037	1,693	(1,319)
Share-based awards		0	(18)			19
Share-based compensation			14
Other			1			2
Net Income	301			301
Dividends declared				(164)
Other comprehensive income	232				232
Shares acquired - share repurchase authorization						(70)
Shares acquired - share-based compensation plans						(4)
Ending Balance at Jun. 30, 2017	$ 7,373	$ 397	$ 1,249	$ 5,174	$ 1,925	$ (1,372)
Beginning Balance (in shares) at Dec. 31, 2016	198.3	164.4
Share-based awards (in shares)		0.6
Shares acquired - share repurchase authorization (in shares)		(1.0)
Shares acquired - share-based compensation plans (in shares)		(0.1)
Ending Balance (in shares) at Jun. 30, 2017	198.3	163.9