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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011 positions	Dec. 31, 2010
Marketable Securities	$ 18,750	$ 16,784
Number of security positions generating unrealized losses	2,100
Total number of security positions	15,300
Commercial Mortage Loans In Default	7
Securities Collateralized by Sub-prime Home Equity Lines of Credit [Member]
Marketable Securities	2	6
Alt-A Securities [Member]
Marketable Securities	$ 9	$ 15
Maximum [Member] \| Non-U.S. Agency Mortgage-Backed Securities [Member]
Commercial mortgage loans in default from the total mortgage backed-security holdings	1.00%

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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