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	226.0
Other Comprehensive Income (Loss), Net of Tax	(1,478.0)
Dividends, Common Stock, Cash	(152.0)			(152.0)
Treasury Stock, Value, Acquired, Cost Method	(54.0)					54.0
Stock Issued During Period, Value, Treasury Stock Reissued	(33.0)		(32.0)	(9.0)		(10.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(2.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	228.0
Net Income (Loss) Attributable to Noncontrolling Interest	2.0
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	7,389.0	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
Net income	(76.0)
Other Comprehensive Income (Loss), Net of Tax					(494.0)
Dividends, Common Stock, Cash	(54.0)			(54.0)
Treasury Stock, Value, Acquired, Cost Method	(27.0)					27.0
Stock Issued During Period, Value, Treasury Stock Reissued	(17.0)		(15.0)	(1.0)		(3.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(75.0)
Net Income (Loss) Attributable to Noncontrolling Interest	1.0
Stockholders' Equity Attributable to Parent	6,755.0	1.0	2,493.0	7,936.0	(1,978.0)	(1,697.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6,845.0
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	744.0
Other Comprehensive Income (Loss), Net of Tax	538.0				538.0
Dividends, Common Stock, Cash	(163.0)			(163.0)
Treasury Stock, Value, Acquired, Cost Method	(169.0)					169.0
Stock Issued During Period, Value, Treasury Stock Reissued	(32.0)		(32.0)	(37.0)		(37.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(5.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	749.0
Net Income (Loss) Attributable to Noncontrolling Interest	5.0
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
Net income	287.0
Other Comprehensive Income (Loss), Net of Tax					65.0
Dividends, Common Stock, Cash	(56.0)			(56.0)
Treasury Stock, Value, Acquired, Cost Method	(50.0)					50.0
Stock Issued During Period, Value, Treasury Stock Reissued	(12.0)		(12.0)	(1.0)		(1.0)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(2.0)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	289.0
Net Income (Loss) Attributable to Noncontrolling Interest	2.0
Stockholders' Equity Attributable to Parent	8,063.0	$ 1.0	$ 2,534.0	$ 8,713.0	$ (1,333.0)	$ (1,852.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	8,153.0
Stockholders' Equity Attributable to Noncontrolling Interest	$ 90.0