Offsetting Assets and Liabilities (Liabilities Subject to Netting) (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Derivatives
Gross Amounts of Recognized Liabilities	$ 4,123		$ 4,370
Securities loaned
Gross Amounts of Recognized Liabilities	290		136
Gross Amounts Not Offset in the Consolidated Balance Sheets
Securities Loaned Not Offset Financial Instruments	(43)	[1]	(15)	[1]
Securities Loaned, Collateral, Right to Reclaim Cash	0		0
Securities Loaned, Collateral, Right to Reclaim Securities	(237)		(117)
Securities Loaned, Net	10		4
Repurchase agreements
Gross Amounts of Recognized Liabilities	50		50
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	0		0
Cash Collateral	0		0
Securities Collateral	(50)		(50)
Net Amount	0		0
Total
Gross Amounts of Recognized Liabilities	4,615		4,994
Gross Amounts Not Offset in the Consolidated Balance Sheets
Derivative Liability Securities Sold Under Agreements to Repurchase Securities Loaned Not Offset Financial Instruments	(3,041)	[1]	(3,262)	[1]
Derivative Liability Securities Sold Under Agreements to Repurchase Securities Loaned Collateral Right to Reclaim Cash	(14)		(2)
Derivative Liability Securities Sold Under Agreements to Repurchase Securities Loaned Collateral Right to Reclaim Securities	(1,550)		(1,665)
Derivative Liability Securities Sold Under Agreements to Repurchase Securities Loaned Net	10		65
OTC
Derivatives
Gross Amounts of Recognized Liabilities	4,193		4,786
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(2,916)	[1]	(3,227)	[1]
Cash Collateral	(14)		0
Securities Collateral	(1,263)		(1,498)
Net Amount	0		61
Over the Counter Cleared Swaps [Member]
Derivatives
Gross Amounts of Recognized Liabilities	82		22
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(82)	[1]	(20)	[1]
Cash Collateral	0		(2)
Securities Collateral
Net Amount
Total Over the Counter Derivatives [Member] [Member]
Derivatives
Gross Amounts of Recognized Liabilities	4,275		4,808
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(2,998)	[1]	(3,247)	[1]
Cash Collateral	(14)		(2)
Securities Collateral	(1,263)		(1,498)
Net Amount	$ 0		$ 61

[1] Represents the amount of liabilities that could be offset by assets with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.