Investments (Maturities of Fixed Maturity Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 15,828	$ 24,177
Amortized Cost, Due after one year through five years	70,467	66,973
Amortized Cost, Due after five years through ten years	78,159	82,376
Amortized Cost, Due after ten years	103,405	97,739
Amortized Cost, Subtotal	267,859	271,265
Amortized Cost, RMBS, CMBS and ABS	65,740	69,605
Amortized cost of fixed maturity securities available-for-sale	333,599	340,870
Estimated Fair Value, Due in one year or less	16,030	24,394
Estimated Fair Value, Due after one year through five years	74,229	70,759
Estimated Fair Value, Due after five years through ten years	83,223	91,975
Estimated Fair Value, Due after ten years	109,529	114,533
Estimated Fair Value, Subtotal	283,011	301,661
Estimated fair value, Mortgage-backed and asset-backed securities	67,176	72,605
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	$ 350,187	$ 374,266