Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Securities available for sale, equity securities, cost	$ 17	$ 20
Securities held to maturity, fixed maturities, fair value	45,846	54,841
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	1,900,000	1,900,000
Common stock, shares issued (in shares)	667,046	665,239
Asset derivatives	488	345
Liability derivatives	837	934
Investments Other Than Consolidated Variable Interest Entities
Securities available for sale, fixed maturities, amortized cost	52,402	48,355
Securities available for sale, perpetual securities, amortized cost	2,524	3,654
Securities held to maturity, fixed maturities, fair value	45,610	54,554
Variable Interest Entity, Consolidated
Securities available for sale, fixed maturities, amortized cost	4,109	5,058
Securities available for sale, perpetual securities, amortized cost	463	559
Securities held to maturity, fixed maturities, fair value	236	287
Asset derivatives	106	191
Liability derivatives	$ 207	$ 399