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)	136.9	0	0	0	0	0	52.4	52.4	84.5
Other comprehensive income (loss), after tax	(1,760.7)	0	0	0	(1,760.7)	0	0	(1,760.7)	0
Total comprehensive income (loss)	(1,623.8)							(1,708.3)
Less: Comprehensive income (loss) attributable to noncontrolling interest	84.5								84.5
Reclassification of noncontrolling interest	0	0	0	0	0	(4.0)	0	(4.0)	4.0
Common stock issuance	571.6	0.3	0	571.3	0	0	0	571.6	0
Common stock acquired - Share repurchase	0	0	0	0	0	0	0	0	0
Dividends on common stock	(2.6)	0	0	(2.6)	0	0	0	(2.6)	0
Share-based compensation	38.4	0	0	38.4	0	0	0	38.4	0
Contributions from (Distributions to) noncontrolling interest, net	(180.3)	0	0	0	0	0	0	0	(180.3)
Beginning balance at Sep. 30, 2013	14,864.5	2.6	0	23,524.7	1,950.0	2.4	(12,709.7)	12,770.0	2,094.5
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)	1,201.9	0	0	0	0	0	905.2	905.2	296.7
Other comprehensive income (loss), after tax	971.1	0	0	0	971.1	0	0	971.1	0
Total comprehensive income (loss)	2,173.0							1,876.3
Less: Comprehensive income (loss) attributable to noncontrolling interest	296.7								296.7
Reclassification of noncontrolling interest	0	0	0	0	0	3.0	0	3.0	(3.0)
Common stock issuance	0	0	0	0	0	0	0	0	0
Common stock acquired - Share repurchase	(609.4)	0	(609.4)	0	0	0	0	(609.4)	0
Dividends on common stock	(7.7)	0	0	(7.7)	0	0	0	(7.7)	0
Share-based compensation	50.7	0	(14.8)	65.5	0	0	0	50.7	0
Contributions from (Distributions to) noncontrolling interest, net	23.6	0	0	0	0	0	0	0	23.6
Beginning balance at Sep. 30, 2014	$ 17,144.2	$ 2.6	$ (624.2)	$ 23,621.5	$ 2,820.2	$ 21.4	$ (11,256.4)	$ 14,585.1	$ 2,559.1