Insurance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	$ 433,635	$ 417,574
Latin America [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	16,055	13,890
Asia [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	103,064	98,267
Europe, the Middle East and Africa [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	20,200	22,348
Retail [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	138,082	138,872
Group, Voluntary & Worksite Benefits [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	29,996	28,899
Corporate Benefit Funding [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	117,065	106,225
Corporate & Other [Member]
Insurance Liabilities
Insurance liabilities comprised of future policy benefits, policyholder account balances and other-related balances	$ 9,173	$ 9,073