Derivatives and Hedging Activities (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Summary of Option Premiums Payable and Receivable
Premiums Payable	$ 2,069
Premiums Receivable	384
Gross notional amount of forwards, futures, total return swaps and commodity swaps	111	146
Gross notional amount of foreign currency forward contracts	30	14
Macro hedge program
Summary of Option Premiums Payable and Receivable
Gross notional amount of index options and futures contracts	710
Embedded Derivative Financial Instruments [Member]
Summary of Option Premiums Payable and Receivable
Gross notional amount of index options and futures contracts	1,500	1,300
Deferred Compensation Plan [Member]
Summary of Option Premiums Payable and Receivable
Gross notional amount of futures contracts	224	5
2014
Summary of Option Premiums Payable and Receivable
Premiums Payable	378
Premiums Receivable	86
2015
Summary of Option Premiums Payable and Receivable
Premiums Payable	349
Premiums Receivable	67
2016
Summary of Option Premiums Payable and Receivable
Premiums Payable	305
Premiums Receivable	51
2017
Summary of Option Premiums Payable and Receivable
Premiums Payable	240
Premiums Receivable	45
2018
Summary of Option Premiums Payable and Receivable
Premiums Payable	196
Premiums Receivable	56
2019-2027
Summary of Option Premiums Payable and Receivable
Premiums Payable	601
Premiums Receivable	$ 79