Condensed Consolidated Statements of Stockholders Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common
Net income	$ 1,170.0
Other Comprehensive Income (Loss), Net of Tax	409.0				$ 409.0
Dividends, Common Stock, Cash	(194.0)			$ (194.0)
Treasury Stock, Value, Acquired, Cost Method	(99.0)					$ 99.0
Stock Issued During Period, Value, Treasury Stock Reissued	(55.0)		$ (55.0)	(8.0)		(8.0)
Stockholders' Equity Attributable to Parent	8,180.0	$ 1.0	2,461.0	7,871.0	(500.0)	(1,653.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	8,180.0
Stockholders' Equity Attributable to Noncontrolling Interest	0.0
Net income	302.0
Other Comprehensive Income (Loss), Net of Tax	(984.0)
Dividends, Common Stock, Cash	(98.0)			(98.0)
Treasury Stock, Value, Acquired, Cost Method	(27.0)					27.0
Stock Issued During Period, Value, Treasury Stock Reissued	(16.0)		(17.0)	(8.0)		(7.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	303.0
Net Income (Loss) Attributable to Noncontrolling Interest	$ 1.0
Common Stock, Dividends, Per Share, Declared	$ 1.46
Net income	$ 517.0
Other Comprehensive Income (Loss), Net of Tax	(1,371.0)				(1,371.0)
Dividends, Common Stock, Cash	(205.0)			(205.0)
Treasury Stock, Value, Acquired, Cost Method	(81.0)					81.0
Stock Issued During Period, Value, Treasury Stock Reissued	(41.0)		(41.0)	(14.0)		(14.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(4.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	521.0
Net Income (Loss) Attributable to Noncontrolling Interest	4.0
Stockholders' Equity Attributable to Parent	7,947.0	1.0	2,465.0	8,014.0	(858.0)	(1,675.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	8,037.0
Stockholders' Equity Attributable to Noncontrolling Interest	90.0
Net income	105.0
Other Comprehensive Income (Loss), Net of Tax					(626.0)
Dividends, Common Stock, Cash	(49.0)			(49.0)
Treasury Stock, Value, Acquired, Cost Method	0.0
Stock Issued During Period, Value, Treasury Stock Reissued	(12.0)		(13.0)	(3.0)		(2.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	106.0
Net Income (Loss) Attributable to Noncontrolling Interest	$ 1.0
Common Stock, Dividends, Per Share, Declared	$ 0.73
Stockholders' Equity Attributable to Parent	$ 7,389.0	1.0	2,478.0	8,067.0	(1,484.0)	(1,673.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,479.0
Stockholders' Equity Attributable to Noncontrolling Interest	90.0
Stockholders' Equity Attributable to Parent	7,081.0	1.0	2,502.0	8,169.0	(1,871.0)	(1,720.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,171.0
Stockholders' Equity Attributable to Noncontrolling Interest	90.0
Net income	457.0
Other Comprehensive Income (Loss), Net of Tax	473.0				473.0
Dividends, Common Stock, Cash	(107.0)			(107.0)
Treasury Stock, Value, Acquired, Cost Method	(119.0)					119.0
Stock Issued During Period, Value, Treasury Stock Reissued	(20.0)		(20.0)	(36.0)		(36.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(3.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	460.0
Net Income (Loss) Attributable to Noncontrolling Interest	$ 3.0
Common Stock, Dividends, Per Share, Declared	$ 1.60
Stockholders' Equity Attributable to Parent	$ 7,626.0	1.0	2,506.0	8,336.0	(1,461.0)	(1,756.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,716.0
Stockholders' Equity Attributable to Noncontrolling Interest	90.0
Net income	205.0
Other Comprehensive Income (Loss), Net of Tax					63.0
Dividends, Common Stock, Cash	(54.0)			(54.0)
Treasury Stock, Value, Acquired, Cost Method	(52.0)					52.0
Stock Issued During Period, Value, Treasury Stock Reissued	(17.0)		(16.0)	(4.0)		(5.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(2.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	207.0
Net Income (Loss) Attributable to Noncontrolling Interest	$ 2.0
Common Stock, Dividends, Per Share, Declared	$ 0.80
Stockholders' Equity Attributable to Parent	$ 7,805.0	$ 1.0	$ 2,522.0	$ 8,483.0	$ (1,398.0)	$ (1,803.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	7,895.0
Stockholders' Equity Attributable to Noncontrolling Interest	$ 90.0