Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Securities available for sale, equity securities, cost	$ 15	$ 17
Securities held to maturity, fixed maturities, fair value	40,716	45,846
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	1,900,000,000	1,900,000,000
Common stock, shares issued (in shares)	667,967,000	667,046,000
Asset derivatives	541	488
Liability derivatives	1,242	837
Investments Other Than Consolidated Variable Interest Entities
Securities available for sale, fixed maturities, amortized cost	59,061	52,402
Securities available for sale, perpetual securities, amortized cost	2,374	2,524
Securities held to maturity, fixed maturities, fair value	40,628	45,610
Variable Interest Entity, Consolidated
Securities available for sale, fixed maturities, amortized cost	3,222	4,109
Securities available for sale, perpetual securities, amortized cost	446	463
Securities held to maturity, fixed maturities, fair value	88	236
Asset derivatives	98	106
Liability derivatives	$ 190	$ 207