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Schedule - Condensed Financial Information of Registrant (Condensed Statements of Cash Flow) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 3,738 $ 3,206 $ 3,090
Adjustments to reconcile net income (loss) to cash provided by operating activities:      
Realized investment (gains) losses, net (2,831) (1,050) 2,897
Change in:      
Other, net 1,676 714 (2,199)
Cash flows from (used in) operating activities 12,377 6,542 5,840
Proceeds from the sale/maturity of:      
Fixed maturities, available for sale 42,548 28,561 42,221
Equity securities, available for sale 3,742 2,485 2,246
Long-term investments 2,120 1,071 1,160
Short-term investments 27,098 20,896 25,905
Payments for the purchase of:      
Equity securities, available for sale (3,080) (2,461) (1,665)
Fixed maturities, available for sale (52,045) (38,213) (42,911)
Other long-term investments (1,865) (824) (1,018)
Short-term investments (26,962) (19,922) (26,876)
Other, net 182 422 (193)
Cash flows from (used in) investing activities (13,295) (8,522) 2,429
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends paid on Common Stock (704) (575) (347)
Common Stock Acquired (999) 0 0
Common Stock reissued for exercise of stock options 122 98 64
Proceeds from Issuance of Common Stock 0 970 1,391
Proceeds from the issuance of debt (maturities longer than 90 days) 2,266 4,561 5,314
Repayments of debt (maturities longer than 90 days) (1,739) (3,738) (7,130)
Net change in financing arrangements (maturities of 90 days or less) 104 684 (4,566)
Excess tax benefits from share-based payment arrangements 20 12 2
Other, net 131 369 251
Cash flows from (used in) financing activities 2,099 1,613 (10,421)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,336 (249) (1,864)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 12,915 [1] 13,164 15,028
CASH AND CASH EQUIVALENTS, END OF YEAR 14,251 [1] 12,915 [1] 13,164
Supplemental Cash Flow Information [Abstract]      
Cash paid during the period for interest 1,285 1,197 1,181
Cash paid (refunds received) during the period for taxes 809 893 (109)
Common Stock [Member]
      
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends paid on Common Stock (685) (556) (328)
Class B Stock [Member]
      
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends paid on Common Stock (19) (19) (19)
Parent Company [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 3,666 3,195 3,124
Adjustments to reconcile net income (loss) to cash provided by operating activities:      
Equity In Earnings Of Subsidiaries (3,841) (3,575) (3,379)
Realized investment (gains) losses, net 23 (185) (210)
Dividends received from subsidiaries 2,955 3,863 388
Change in:      
Due to/from subsidiaries, net 525 224 397
Other, net (666) (996) 860
Cash flows from (used in) operating activities 2,662 2,526 1,180
Proceeds from the sale/maturity of:      
Fixed maturities, available for sale 4 99 0
Equity securities, available for sale 4 0 0
Commercial Loans 25 0 0
Long-term investments 468 799 1,359
Short-term investments 2,288 1,661 3,049
Payments for the purchase of:      
Equity securities, available for sale (4) 0 0
Fixed maturities, available for sale 0 (98) (198)
Commercial Loans (269) 0 0
Short-term investments (2,301) (2,086) (3,002)
Capital contributions to affiliates (1,593) (2,199) (1,567)
Returns of capital contributions from subsidiaries 287 112 917
Proceeds from sale of subsidiaries 91 0 0
Loans to subsidiaries, net of maturities (2,824) (1,870) (1,500)
Other, net 24 42 168
Cash flows from (used in) investing activities (3,800) (3,540) (774)
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends paid on Common Stock (704) (575) (347)
Common Stock Acquired (999) 0 0
Common Stock reissued for exercise of stock options 122 98 64
Proceeds from Issuance of Common Stock 0 970 1,391
Proceeds from the issuance of debt (maturities longer than 90 days) 1,741 3,349 2,640
Repayments of debt (maturities longer than 90 days) (704) (621) (3,446)
Repayments of loans from subsidiaries (45) (130) 0
Proceeds from loans payable to subsidiaries 3 149 0
Net change in financing arrangements (maturities of 90 days or less) (12) 169 (1,190)
Excess tax benefits from share-based payment arrangements 2 6 0
Other, net (7) 16 (75)
Cash flows from (used in) financing activities (603) 3,431 (963)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (1,741) 2,417 (557)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 5,587 3,170 3,727
CASH AND CASH EQUIVALENTS, END OF YEAR 3,846 5,587 3,170
Supplemental Cash Flow Information [Abstract]      
Cash paid during the period for interest 1,028 910 893
Cash paid (refunds received) during the period for taxes 135 812 (977)
NON-CASH TRANSACTIONS DURING THE PERIOD      
Non-cash capital transactions 0 106 0
Capital contribution to subsidiary in the form of repayment of loans from subsidiary 0 (44) (907)
Capital tranaction with subsidiary in the form of a tax liability 18 0 (313)
Treasury stock shares issued for stock-based compensation programs 77 74 100
Parent Company [Member] | Common Stock [Member]
      
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends paid on Common Stock (685) (556) (328)
Parent Company [Member] | Class B Stock [Member]
      
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash dividends paid on Common Stock $ (19) $ (19) $ (19)
[1] (1) See Note 5 for details of balances associated with variable interest entities.