Schedule II - Condensed Financial Information (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended			14 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 28, 2013
Benefits and Expenses
Other operating expenses																	$ 7,455,000,000	$ 6,062,000,000	$ 5,869,000,000
(Income) from discontinued operations																	0	0	0
Shareholders' net income	406,000,000	[1]	466,000,000	[2]	380,000,000	[3]	371,000,000	[4]	273,000,000	[5]	183,000,000	[6]	391,000,000	[7]	413,000,000	[8]	1,623,000,000	1,260,000,000	1,279,000,000
Net unrealized appreciation (deprecation) on securities:
Net unrealized appreciation (depreciation), fixed maturities																	144,000,000	210,000,000	151,000,000
Net unrealized appreciation (depreciation), equity securities																	3,000,000	(2,000,000)	(1,000,000)
Net unrealized appreciation (depreciation) on securities																	147,000,000	208,000,000	150,000,000
Net unrealized appreciation (depreciation), derivatives																	(5,000,000)	1,000,000	6,000,000
Net translation of foreign currencies																	66,000,000	(22,000,000)	33,000,000
Increase (decrease) to postretirement benefits liability adjustement after-tax																	92,000,000	360,000,000	189,000,000
Shareholders' other comprehensive income (loss)																	116,000,000	(173,000,000)	0
Shareholders' comprehensive income																	1,739,000,000	1,087,000,000	1,279,000,000
Assets
Cash and cash equivalents	2,978,000,000								4,690,000,000								2,978,000,000	4,690,000,000	1,605,000,000
Other assets, including other intangibles	2,355,000,000								1,750,000,000								2,355,000,000	1,750,000,000
Total assets	53,734,000,000								50,697,000,000								53,734,000,000	50,697,000,000
Liabilities Abstract
Short-term debt	201,000,000								104,000,000								201,000,000	104,000,000
Long-term debt	4,986,000,000								4,990,000,000								4,986,000,000	4,990,000,000
Total liabilities	43,851,000,000								42,703,000,000								43,851,000,000	42,703,000,000
Shareholders Equity [Abstract]
Common stock (par value per share, $0.25; shares issued,366; authorized, 600)	92,000,000								92,000,000								92,000,000	92,000,000
Additional paid-in capital	3,295,000,000								3,188,000,000								3,295,000,000	3,188,000,000
Accumulated Other Comprehensive Income Loss Available For Sale Fixed Securities Adjustment Net Of Tax	883,000,000								739,000,000								883,000,000	739,000,000
Accumulated Other Comprehensive Income Loss Available For Sale Equity Securities Adjustment Net Of Tax	4,000,000								1,000,000								4,000,000	1,000,000
Net unrealized depreciation, derivatives	(28,000,000)								(23,000,000)								(28,000,000)	(23,000,000)
Net translation foreign currencies	69,000,000								3,000,000								69,000,000	3,000,000
Postretirement benefits liability adjustment	1,599,000,000								1,507,000,000								1,599,000,000	1,507,000,000
Accumulated other comprehensive loss	(671,000,000)								(787,000,000)								(671,000,000)	(787,000,000)
Retained earnings (BS)	12,330,000,000								10,787,000,000								12,330,000,000	10,787,000,000
Less treasury stock, at cost	5,277,000,000								5,286,000,000								5,277,000,000	5,286,000,000
Total shareholders' equity	9,769,000,000								7,994,000,000								9,769,000,000	7,994,000,000
Total liabilities and equity	53,734,000,000								50,697,000,000								53,734,000,000	50,697,000,000
Consolidated Statements of Cash Flows
Shareholders' net income	406,000,000	[1]	466,000,000	[2]	380,000,000	[3]	371,000,000	[4]	273,000,000	[5]	183,000,000	[6]	391,000,000	[7]	413,000,000	[8]	1,623,000,000	1,260,000,000	1,279,000,000
(Income) from discontinued operations																	0	0	0
Accounts payable accrued expenses and other liabilities																	(132,000,000)	344,000,000	(272,000,000)
Other, net																	(28,000,000)	30,000,000	(5,000,000)
Net cash provided by operating activities																	2,350,000,000	1,491,000,000	1,743,000,000
Net change in short-term debt																	98,000,000	0	0
Net proceeds on issuance of long-term debt																	0	2,676,000,000	543,000,000
Repayment of long-term debt																	326,000,000	451,000,000	270,000,000
Issuance of common stock																	121,000,000	734,000,000	64,000,000
Common dividends paid																	11,000,000	11,000,000	11,000,000
Payments For Repurchase Of Common Stock																	208,000,000	225,000,000	201,000,000	208,000,000
Net cash provided by financing activities																	(228,000,000)	2,867,000,000	274,000,000
Net increase in cash and cash equivalents																	(1,712,000,000)	3,085,000,000	681,000,000
Cash and cash equivalents, beginning of year							4,690,000,000								1,605,000,000		4,690,000,000	1,605,000,000	924,000,000	4,690,000,000
Cash and cash equivalents, end of year	2,978,000,000								4,690,000,000								2,978,000,000	4,690,000,000	1,605,000,000
Debt Details Table [Abstract]
Commercial Paper Outstanding	200,000,000								100,000,000								200,000,000	100,000,000
Current maturities of long-term debt	1,000,000								4,000,000								1,000,000	4,000,000
Total short-term debt	201,000,000								104,000,000								201,000,000	104,000,000
Long-term Debt, Excluding Current Maturities	4,986,000,000								4,990,000,000								4,986,000,000	4,990,000,000
Notes To Condensed Statements Details [Abstract]
Credit Facility Remaining Borrowing Capacity	5,300,000,000																5,300,000,000
Short-term and Long-term Debt Outstanding	5,200,000,000																5,200,000,000
Repayments Of Debt																		449,000,000
Future Maturities of Debt and Capital Leases in 2012	1,000,000																1,000,000
Future Maturities of Debt and Capital Leases in 2013	23,000,000																23,000,000
Future Maturities of Debt and Capital Leases in 2014	0																0
Future Maturities of Debt and Capital Leases in 2015	600,000,000																600,000,000
Future Maturities of Debt and Capital Leases in 2016	250,000,000																250,000,000
Long Term Debt Maturities Repayments Of Principal And Capital Leases After Year Five	remainder																remainder
Interest Expense on Long-term Debt, Short-term Debt and Capital Leases																	268,000,000	202,000,000	182,000,000
Proceeds From Issuance Of Common Stock Net																		629,000,000
Proceeds From Issuance Of Common Stock Gross																		650,000,000
Stock Issued During Period, Shares, New Issues																	0	15,200
Cost of Common Stock Issued Per Share									$ 42.75									$ 42.75
Interest paid																	248,000,000	185,000,000	180,000,000
Notes due 2016 2.75% Interest [Member]
Liabilities Abstract
Long-term debt	600,000,000								600,000,000								600,000,000	600,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	600,000,000								600,000,000								600,000,000	600,000,000
Notes due 2016 2.75% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	600,000,000																600,000,000
Debt Instrument Interest Rate Stated Percentage	2.75%																2.75%
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	30
Debt Instrument Interest Rate Basis Effective Rate	2.936%																2.936%
Notes due 2017 5.375% Interest [Member]
Liabilities Abstract
Long-term debt	250,000,000								250,000,000								250,000,000	250,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	250,000,000								250,000,000								250,000,000	250,000,000
Notes due 2017 5.375% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	5.375%																5.375%
Notes due 2018 6.35% Interest [Member]
Liabilities Abstract
Long-term debt	131,000,000								131,000,000								131,000,000	131,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	131,000,000								131,000,000								131,000,000	131,000,000
Notes due 2018 6.35% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	6.35%																6.35%
Basis Points Added To Treasury Rate																			45
Repayments Of Debt																			198,000,000
Debt Tender Pricing Yield																			3.923%
Amount Of Debt Tendered																			169,000,000
Gain (loss) on extinquishment of debt, net of tax																			18,000,000
Notes due 2019 8.5% Interest [Member]
Liabilities Abstract
Long-term debt	251,000,000								251,000,000								251,000,000	251,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	251,000,000								251,000,000								251,000,000	251,000,000
Notes To Condensed Statements Details [Abstract]
Debt Tender Pricing Yield																			4.128%
Notes due 2019 8.5% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	8.50%																8.50%
Basis Points Added To Treasury Rate																			100.00
Repayments Of Debt																			130,000,000
Amount Of Debt Tendered																			99,000,000
Gain (loss) on extinquishment of debt, net of tax																			21,000,000
Notes due 2020 4.375% Interest [Member]
Liabilities Abstract
Long-term debt	249,000,000								249,000,000								249,000,000	249,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	249,000,000								249,000,000								249,000,000	249,000,000
Notes To Condensed Statements Details [Abstract]
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	25
Notes due 2020 4.375% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	250,000,000																250,000,000
Debt Instrument Interest Rate Stated Percentage	4.375%																4.375%
Debt Instrument Interest Rate Basis Effective Rate	5.10%																5.10%
Notes due 2020 5.125% Interest [Member]
Liabilities Abstract
Long-term debt	299,000,000								299,000,000								299,000,000	299,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	299,000,000								299,000,000								299,000,000	299,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value									300,000,000									300,000,000
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	25
Notes due 2020 5.125% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	5.125%																5.125%
Debt Instrument Interest Rate Basis Effective Rate	5.36%																5.36%
Notes Due 2021 4.5% Interest [Member]
Liabilities Abstract
Long-term debt	299,000,000								298,000,000								299,000,000	298,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	299,000,000								298,000,000								299,000,000	298,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	300,000,000																300,000,000
Notes Due 2021 4.5% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	4.50%																4.50%
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	20
Debt Instrument Interest Rate Basis Effective Rate	4.683%																4.683%
Notes due 2022 4% Interest [Member]
Liabilities Abstract
Long-term debt	743,000,000								743,000,000								743,000,000	743,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	743,000,000								743,000,000								743,000,000	743,000,000
Notes due 2022 4% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	750,000,000																750,000,000
Debt Instrument Interest Rate Stated Percentage	4.00%																4.00%
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	35
Debt Instrument Interest Rate Basis Effective Rate	4.346%																4.346%
Notes due 2023 7.65% Interest [Member]
Liabilities Abstract
Long-term debt	100,000,000								100,000,000								100,000,000	100,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	100,000,000								100,000,000								100,000,000	100,000,000
Notes due 2023 7.65% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	7.65%																7.65%
Notes due 2023 8.3% Interest [Member]
Liabilities Abstract
Long-term debt	17,000,000								17,000,000								17,000,000	17,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	17,000,000								17,000,000								17,000,000	17,000,000
Notes due 2023 8.3% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	8.30%																8.30%
Debentures due 2027 7.875% Interest [Member]
Liabilities Abstract
Long-term debt	300,000,000								300,000,000								300,000,000	300,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	300,000,000								300,000,000								300,000,000	300,000,000
Debentures due 2027 7.875% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	7.875%																7.875%
Step Down Notes Due 2033 8.3% Interest [Member]
Liabilities Abstract
Long-term debt	83,000,000								83,000,000								83,000,000	83,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	83,000,000								83,000,000								83,000,000	83,000,000
Step Down Notes Due 2033 8.3% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	8.30%																8.30%
Notes due 2036 6.15% Interest [Member]
Liabilities Abstract
Long-term debt	500,000,000								500,000,000								500,000,000	500,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	500,000,000								500,000,000								500,000,000	500,000,000
Notes due 2036 6.15% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage	6.15%																6.15%
Notes Due 2041 5.875% Interest [Member]
Liabilities Abstract
Long-term debt	298,000,000								298,000,000								298,000,000	298,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	298,000,000								298,000,000								298,000,000	298,000,000
Notes Due 2041 5.875% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	300,000,000																300,000,000
Debt Instrument Interest Rate Stated Percentage	5.875%																5.875%
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	25
Debt Instrument Interest Rate Basis Effective Rate	6.008%																6.008%
Notes due 2042 5.375% Interest [Member]
Liabilities Abstract
Long-term debt	750,000,000								750,000,000								750,000,000	750,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	750,000,000								750,000,000								750,000,000	750,000,000
Notes due 2042 5.375% Interest [Member] | Unsecured Debt [Member]
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	750,000,000																750,000,000
Debt Instrument Interest Rate Stated Percentage	5.375%																5.375%
Percentage of principal amount to be paid upon redemption																	100.00%
Basis Points Added To Treasury Rate																	40
Debt Instrument Interest Rate Basis Effective Rate	5.542%																5.542%
Parent Company [Member]
Benefits and Expenses
Interest Expense																	262,000,000	195,000,000	176,000,000
Intercompany Interest Expense																	0	19,000,000	26,000,000
Other operating expenses																	190,000,000	92,000,000	129,000,000
Operating Expenses																	452,000,000	306,000,000	331,000,000
Operating Income (Loss)																	(452,000,000)	(306,000,000)	(331,000,000)
Total Parent Company Tax Benefit																	(143,000,000)	(107,000,000)	(106,000,000)
Loss Of Parent Company																	(309,000,000)	(199,000,000)	(225,000,000)
Equity In Income Of Subsidiaries From Continuing Operations																	1,932,000,000	1,459,000,000	1,504,000,000
Shareholders' net income																	1,623,000,000	1,260,000,000	1,279,000,000
Assets
Cash and cash equivalents	115,000,000								0								115,000,000	0	0
Investments in and Advances to Affiliates, Amount of Equity	16,125,000,000								14,606,000,000								16,125,000,000	14,606,000,000
Due from Affiliates	37,000,000								29,000,000								37,000,000	29,000,000
Other assets, including other intangibles	729,000,000								793,000,000								729,000,000	793,000,000
Total assets	17,006,000,000								15,428,000,000								17,006,000,000	15,428,000,000
Liabilities Abstract
Due to Affiliate	289,000,000								489,000,000								289,000,000	489,000,000
Short-term debt	200,000,000								100,000,000								200,000,000	100,000,000
Long-term debt	4,870,000,000								4,869,000,000								4,870,000,000	4,869,000,000
Nonrecourse obligations	1,878,000,000								1,976,000,000								1,878,000,000	1,976,000,000
Total liabilities	7,237,000,000								7,434,000,000								7,237,000,000	7,434,000,000
Shareholders Equity [Abstract]
Common stock (par value per share, $0.25; shares issued,366; authorized, 600)	92,000,000								92,000,000								92,000,000	92,000,000
Additional paid-in capital	3,295,000,000								3,188,000,000								3,295,000,000	3,188,000,000
Accumulated Other Comprehensive Income Loss Available For Sale Fixed Securities Adjustment Net Of Tax	883,000,000								739,000,000								883,000,000	739,000,000
Accumulated Other Comprehensive Income Loss Available For Sale Equity Securities Adjustment Net Of Tax	4,000,000								1,000,000								4,000,000	1,000,000
Net unrealized depreciation, derivatives	(28,000,000)								(23,000,000)								(28,000,000)	(23,000,000)
Net translation foreign currencies	69,000,000								3,000,000								69,000,000	3,000,000
Postretirement benefits liability adjustment	(1,599,000,000)								(1,507,000,000)								(1,599,000,000)	(1,507,000,000)
Retained earnings (BS)	12,330,000,000								10,787,000,000								12,330,000,000	10,787,000,000
Less treasury stock, at cost	(5,277,000,000)								(5,286,000,000)								(5,277,000,000)	(5,286,000,000)
Total shareholders' equity	9,769,000,000								7,994,000,000								9,769,000,000	7,994,000,000
Total liabilities and equity	17,006,000,000								15,428,000,000								17,006,000,000	15,428,000,000
Consolidated Statements of Cash Flows
Shareholders' net income																	1,623,000,000	1,260,000,000	1,279,000,000
Equity In Income Of Subsidiaries																	(1,932,000,000)	(1,459,000,000)	(1,504,000,000)
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries																	671,000,000	1,135,000,000	1,050,000,000
Accounts payable accrued expenses and other liabilities																	(213,000,000)	(296,000,000)	(294,000,000)
Other, net																	191,000,000	(92,000,000)	158,000,000
Increase (Decrease) in Due to Affiliates																	(208,000,000)	(3,258,000,000)	(816,000,000)
Other Investing Net																	(19,000,000)
Net change in short-term debt																	100,000,000		0
Net proceeds on issuance of long-term debt																	0	2,661,000,000	543,000,000
Repayment of long-term debt																	0	(449,000,000)	(268,000,000)
Issuance of common stock																	121,000,000	734,000,000	64,000,000
Common dividends paid																	(11,000,000)	(11,000,000)	(11,000,000)
Payments For Repurchase Of Common Stock																	(208,000,000)	(225,000,000)	(201,000,000)
Net increase in cash and cash equivalents																	115,000,000	0	0
Cash and cash equivalents, beginning of year							0								0		0	0	0	0
Cash and cash equivalents, end of year	115,000,000								0								115,000,000	0	0
Debt Details Table [Abstract]
Commercial Paper Outstanding	200,000,000								100,000,000								200,000,000	100,000,000
Current maturities of long-term debt	0								0								0	0
Total short-term debt	200,000,000								100,000,000								200,000,000	100,000,000
Long-term Debt, Excluding Current Maturities	4,870,000,000								4,869,000,000								4,870,000,000	4,869,000,000
Notes To Condensed Statements Details [Abstract]
Revolving Credit And Letter Of Credit Agreement Term																	5 years
Revolving Credit And Letter Of Credit Agreement	1,500,000,000																1,500,000,000
Lettersof Credit Current Borrowing Capacity	500,000,000																500,000,000
Number Of Banks Participating In Revolving Credit And Letter Of Credit Agreement	16																16
Line of Credit Facility, Optional Maximum Borrowing Capacity	2,000,000,000																2,000,000,000
Credit Facility Remaining Borrowing Capacity	5,300,000,000																5,300,000,000
Short-term and Long-term Debt Outstanding	5,200,000,000																5,200,000,000
Letters of Credit Outstanding, Amount	66,000,000																66,000,000
Future Maturities of Debt and Capital Leases in 2012	0																0
Future Maturities of Debt and Capital Leases in 2013	0																0
Future Maturities of Debt and Capital Leases in 2014	0																0
Future Maturities of Debt and Capital Leases in 2015	600,000,000																600,000,000
Future Maturities of Debt and Capital Leases in 2016	250,000,000																250,000,000
Long Term Debt Maturities Repayments Of Principal And Capital Leases After Year Five	remainder																remainder
Interest Expense on Long-term Debt, Short-term Debt and Capital Leases																	262,000,000	195,000,000	176,000,000
Bank letter of credit arranged for reinsurance subsidiary	3,000,000																3,000,000
Payment guarantee on surety bonds obtained by subsidiaries	28,000,000																28,000,000
Letter of credit required by insurer of high-deductible self-insurance program	12,000,000																12,000,000
Solvency guarantee required by regulators for Insurance subsidiaries	34,000,000																34,000,000
Bank letter of credit arranged for subsidiary	50,000,000																50,000,000
Guarantee on reserve related to assumed reinsurance business of subsidiary	43,000,000																43,000,000
Proceeds From Issuance Of Common Stock Net																	629,000,000
Proceeds From Issuance Of Common Stock Gross																	650,000,000
Stock Issued During Period, Shares, New Issues																	15,200
Cost of Common Stock Issued Per Share	$ 42.75																$ 42.75
Average Interest Rate On Intercompany Loan																	0.71%	0.63%
Interest paid																	242,000,000	179,000,000	175,000,000
Parent Company [Member] | Notes due 2016 2.75% Interest [Member]
Liabilities Abstract
Long-term debt	600,000,000								600,000,000								600,000,000	600,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	600,000,000								600,000,000								600,000,000	600,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	600,000,000																600,000,000
Debt Instrument Interest Rate Stated Percentage	2.75%																2.75%
Basis Points Added To Treasury Rate																	30
Debt Instrument Interest Rate Basis Effective Rate	2.93%																2.93%
Parent Company [Member] | Notes due 2017 5.375% Interest [Member]
Liabilities Abstract
Long-term debt	250,000,000								250,000,000								250,000,000	250,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	250,000,000								250,000,000								250,000,000	250,000,000
Parent Company [Member] | Notes due 2018 6.35% Interest [Member]
Liabilities Abstract
Long-term debt	131,000,000								131,000,000								131,000,000	131,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	131,000,000								131,000,000								131,000,000	131,000,000
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage									6.35%									6.35%
Basis Points Added To Treasury Rate																		45
Repayments Of Debt																		198,000,000
Debt Tender Pricing Yield																		3.923%
Amount Of Debt Tendered																		169,000,000
Gain (loss) on extinquishment of debt, net of tax																		18,000,000
Parent Company [Member] | Notes due 2019 8.5% Interest [Member]
Liabilities Abstract
Long-term debt	251,000,000								251,000,000								251,000,000	251,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	251,000,000								251,000,000								251,000,000	251,000,000
Notes To Condensed Statements Details [Abstract]
Debt Instrument Interest Rate Stated Percentage									8.50%									8.50%
Basis Points Added To Treasury Rate																		100.00
Repayments Of Debt																		130,000,000
Debt Tender Pricing Yield																		4.128%
Amount Of Debt Tendered																		99,000,000
Gain (loss) on extinquishment of debt, net of tax																		21,000,000
Parent Company [Member] | Notes due 2020 4.375% Interest [Member]
Liabilities Abstract
Long-term debt	249,000,000								249,000,000								249,000,000	249,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	249,000,000								249,000,000								249,000,000	249,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value									250,000,000									250,000,000
Debt Instrument Interest Rate Stated Percentage									4.375%									4.375%
Debt Instrument Interest Rate Basis Effective Rate									5.10%									5.10%
Parent Company [Member] | Notes due 2020 5.125% Interest [Member]
Liabilities Abstract
Long-term debt	299,000,000								299,000,000								299,000,000	299,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	299,000,000								299,000,000								299,000,000	299,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value									300,000,000									300,000,000
Debt Instrument Interest Rate Stated Percentage									5.125%									5.125%
Debt Instrument Interest Rate Basis Effective Rate									5.36%									5.36%
Parent Company [Member] | Notes Due 2021 4.5% Interest [Member]
Liabilities Abstract
Long-term debt	299,000,000								298,000,000								299,000,000	298,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	299,000,000								298,000,000								299,000,000	298,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	300,000,000																300,000,000
Debt Instrument Interest Rate Stated Percentage	4.50%																4.50%
Basis Points Added To Treasury Rate																	20
Debt Instrument Interest Rate Basis Effective Rate	4.683%																4.683%
Parent Company [Member] | Notes due 2022 4% Interest [Member]
Liabilities Abstract
Long-term debt	743,000,000								743,000,000								743,000,000	743,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	743,000,000								743,000,000								743,000,000	743,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	750,000,000																750,000,000
Debt Instrument Interest Rate Stated Percentage	4.00%																4.00%
Basis Points Added To Treasury Rate																	35
Debt Instrument Interest Rate Basis Effective Rate	4.346%																4.346%
Parent Company [Member] | Notes due 2023 7.65% Interest [Member]
Liabilities Abstract
Long-term debt	100,000,000								100,000,000								100,000,000	100,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	100,000,000								100,000,000								100,000,000	100,000,000
Parent Company [Member] | Notes due 2023 8.3% Interest [Member]
Liabilities Abstract
Long-term debt	17,000,000								17,000,000								17,000,000	17,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	17,000,000								17,000,000								17,000,000	17,000,000
Parent Company [Member] | Debentures due 2027 7.875% Interest [Member]
Liabilities Abstract
Long-term debt	300,000,000								300,000,000								300,000,000	300,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	300,000,000								300,000,000								300,000,000	300,000,000
Parent Company [Member] | Step Down Notes Due 2033 8.3% Interest [Member]
Liabilities Abstract
Long-term debt	83,000,000								83,000,000								83,000,000	83,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	83,000,000								83,000,000								83,000,000	83,000,000
Parent Company [Member] | Notes due 2036 6.15% Interest [Member]
Liabilities Abstract
Long-term debt	500,000,000								500,000,000								500,000,000	500,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	500,000,000								500,000,000								500,000,000	500,000,000
Parent Company [Member] | Notes Due 2041 5.875% Interest [Member]
Liabilities Abstract
Long-term debt	298,000,000								298,000,000								298,000,000	298,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	298,000,000								298,000,000								298,000,000	298,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	300,000,000																300,000,000
Debt Instrument Interest Rate Stated Percentage	5.875%																5.875%
Basis Points Added To Treasury Rate																	25
Debt Instrument Interest Rate Basis Effective Rate	6.008%																6.008%
Parent Company [Member] | Notes due 2042 5.375% Interest [Member]
Liabilities Abstract
Long-term debt	750,000,000								750,000,000								750,000,000	750,000,000
Debt Details Table [Abstract]
Long-term Debt, Excluding Current Maturities	750,000,000								750,000,000								750,000,000	750,000,000
Notes To Condensed Statements Details [Abstract]
Long Term Debt Face Value	$ 750,000,000																$ 750,000,000
Debt Instrument Interest Rate Stated Percentage	5.375%																5.375%
Basis Points Added To Treasury Rate																	40
Debt Instrument Interest Rate Basis Effective Rate	5.542%																5.542%

[1] The fourth quarter of 2012 includes an after-tax gain of $7 million for the GMIB business and an after-tax charge of $68 million for litigation matters

[2] The third quarter of 2012 includes an after-tax gain of $32 million for the GMIB business, an after-tax charge of $12 million for costs associated with acquisitions, and an after-tax charge of $50 million for costs associated with a realignment and efficiency plan.

[3] The second quarter of 2012 includes an after-tax loss of $51 million for the GMIB business.

[4] The first quarter of 2012 includes an after-tax gain of $41 million for the GMIB business, an after-tax charge of $28 million for costs associated with acquisitions, and an after-tax charge of $13 million for costs associated a litigation matter in Global Health Care.

[5] The fourth quarter of 2011 includes an after-tax gain of $7 million for the GMIB business and, an after-tax charge of $31 million for costs associated with acquisitions.

[6] The third quarter of 2011 includes an after-tax loss of $134 million for the GMIB business.

[7] The second quarter of 2011 includes an after-tax loss of $21 million for the GMIB business.

[8] The first quarter of 2011 includes an after-tax gain of $13 million for the GMIB business and a net tax benefit of $24 million related to the resolution of a Federal tax matter.