Condensed Consolidated Statements of Changes in Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit), Appropriated	Retained Earnings (Deficit), Unappropriated	Shareholders' Equity	Noncontrolling Interest
Ending balance at Dec. 31, 2012	$ 16,061.2	$ 2.3	$ 0	$ 22,917.6	$ 3,710.7	$ 6.4	$ (12,762.1)	$ 13,874.9	$ 2,186.3
Comprehensive income:
Net income (loss)	(225.5)						(212.0)	(212.0)	(13.5)
Other comprehensive income (loss), after tax	(257.9)				(257.9)			(257.9)
Total comprehensive income (loss)	(483.4)							(469.9)	(13.5)
Reclassification of noncontrolling interest	0					(6.2)		(6.2)	6.2
Common stock acquired - Share buyback	0		0					0
Dividends on common stock	0			0				0
Share-based compensation	(7.7)		0	(7.7)				(7.7)
Contribution from (Distribution to) noncontrolling interest, net	28.8								28.8
Beginning balance at Mar. 31, 2013	15,598.9	2.3	0	22,909.9	3,452.8	0.2	(12,974.1)	13,391.1	2,207.8
Ending balance at Dec. 31, 2013	15,514.0	2.6	0	23,563.7	1,849.1	18.4	(12,161.6)	13,272.2	2,241.8
Comprehensive income:
Net income (loss)	271.6						258.1	258.1	13.5
Other comprehensive income (loss), after tax	728.4				728.4			728.4
Total comprehensive income (loss)	1,000.0							986.5	13.5
Reclassification of noncontrolling interest	0					(3.2)		(3.2)	3.2
Common stock acquired - Share buyback	(258.9)		(258.9)					(258.9)
Dividends on common stock	(2.6)			(2.6)				(2.6)
Share-based compensation	7.5		(10.9)	18.4				7.5
Contribution from (Distribution to) noncontrolling interest, net	108.0								108.0
Beginning balance at Mar. 31, 2014	$ 16,368.0	$ 2.6	$ (269.8)	$ 23,579.5	$ 2,577.5	$ 15.2	$ (11,903.5)	$ 14,001.5	$ 2,366.5