Segment Reporting (Details 4) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of "Core Earnings" Adjustments to GAAP
Net tax effect(3)	$ 9,585,000	$ (198,978,000)	$ (90,126,000)	$ (358,138,000)
Net income	(5,648,000)	337,818,000	169,046,000	577,958,000
Adjustment [Member]
Summary of "Core Earnings" Adjustments to GAAP
"Core Earnings" adjustments to GAAP	(420,000,000)	201,000,000	(559,000,000)	259,000,000
Net tax effect(3)	154,000,000	(74,000,000)	208,000,000	(106,000,000)
Net income	(266,000,000)	127,000,000	(351,000,000)	153,000,000
Adjustment [Member] | Net impact of derivative accounting [Member]
Summary of "Core Earnings" Adjustments to GAAP
"Core Earnings" adjustments to GAAP	(414,000,000)	211,000,000	(547,000,000)	278,000,000
Adjustment [Member] | Net impact of acquired intangibles [Member]
Summary of "Core Earnings" Adjustments to GAAP
"Core Earnings" adjustments to GAAP	$ (6,000,000)	$ (10,000,000)	$ (12,000,000)	$ (19,000,000)