Insurance (Liabilities for Unpaid Claims and Claim Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Liabilities for Unpaid Claims and Claim Expenses
Balance at January 1,	$ 10,436	$ 10,117	$ 10,708
Less: Reinsurance recoverables	1,581	1,436	2,198
Net balance at January 1,	8,855	8,681	8,510
Incurred related to:
Current year	8,660	8,399	9,028
Prior years	(86)	(69)	(199)
Total incurred	8,574	8,330	8,829
Paid related to:
Current year	(6,083)	(5,689)	(6,238)
Prior years	(2,377)	(2,467)	(2,420)
Total paid	(8,460)	(8,156)	(8,658)
Net balance at December 31,	8,969	8,855	8,681
Add: Reinsurance recoverables	1,661	1,581	1,436
Balance at December 31,	$ 10,630	$ 10,436	$ 10,117