Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statement Of Cash Flows [Abstract]
Net cash provided by operating activities	$ 406	$ 519
Cash flows from investing activities
Sales, maturities and repayments of fixed maturity securities	8,910	8,500
Sales, maturities and repayments of equity securities	131	109
Sales, maturities and repayments of mortgage loans	517	437
Sales, maturities and repayments of real estate and real estate joint ventures	6	9
Sales, maturities and repayments of other limited partnership interests	171	56
Purchases of fixed maturity securities	(10,303)	(9,145)
Purchases of equity securities	(6)	(46)
Purchases of mortgage loans	(387)	(395)
Purchases of real estate and real estate joint ventures	(48)	(57)
Purchases of other limited partnership interests	(176)	(163)
Cash received in connection with freestanding derivatives	286	48
Cash paid in connection with freestanding derivatives	(250)	(108)
Net change in policy loans	0	(1)
Net change in short-term investments	(972)	(202)
Net change in other invested assets	(253)	(39)
Other, net	1	0
Net cash used in investing activities	(2,373)	(997)
Cash flows from financing activities
Policyholder account balances: Deposits	10,207	12,565
Policyholder account balances: Withdrawals	(8,858)	(12,604)
Net change in payables for collateral under securities loaned and other transactions	98	491
Long-term debt repaid	(170)	(311)
Financing element on certain derivative instruments	(23)	(15)
Net cash provided by financing activities	1,254	126
Effect of change in foreign currency exchange rates on cash and cash equivalents balances	5	(24)
Change in cash and cash equivalents	(708)	(376)
Cash and cash equivalents, beginning of period	1,928	2,574
Cash and cash equivalents, end of period	1,220	2,198
Supplemental disclosures of cash flow information:
Net cash paid during the period for interest	221	245
Net cash paid during the period for income tax	$ 20	$ 42