Offsetting Assets and Liabilities (Liabilities Subject to Netting) (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivatives [Abstract]
Gross amounts of recognized liabilities	$ 4,139		$ 4,370
Securities loaned [Abstract]
Gross amounts of recognized liabilities	249		136
Gross amounts not offset in the consolidated balance sheets [Abstract]
Financial instruments	(82)	[1]	(15)	[1]
Securities collateral	(159)		(117)
Net amount	8		4
Repurchase agreements [Abstract]
Gross amounts of recognized liabilities	50		50
Gross amounts not offset in the consolidated balance sheets [Abstract]
Securities collateral	(50)		(50)
Net amount	0		0
Total [Abstract]
Gross amounts of recognized liabilities	4,301		4,994
Gross amounts not offset in the consolidated balance sheets [Abstract]
Financial instruments	(3,069)	[1]	(3,262)	[1]
Cash collateral	(10)		(2)
Securities collateral	(1,214)		(1,665)
Net amount	8		65
OTC [Member]
Derivatives [Abstract]
Gross amounts of recognized liabilities	3,908		4,786
Gross amounts not offset in the consolidated balance sheets [Abstract]
Financial instruments	(2,895)	[1]	(3,227)	[1]
Cash collateral	(8)
Securities collateral	(1,005)		(1,498)
Net amount	0		61
OTC cleared [Member]
Derivatives [Abstract]
Gross amounts of recognized liabilities	94		22
Gross amounts not offset in the consolidated balance sheets [Abstract]
Financial instruments	(92)	[1]	(20)	[1]
Cash collateral	(2)		(2)
Net amount
Total derivatives [Member]
Derivatives [Abstract]
Gross amounts of recognized liabilities	4,002		4,808
Gross amounts not offset in the consolidated balance sheets [Abstract]
Financial instruments	(2,987)	[1]	(3,247)	[1]
Cash collateral	(10)		(2)
Securities collateral	(1,005)		(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.