Accumulated Other Comprehensive Income Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	$ (64)		$ 53
Income tax expense (benefit)	160		(197)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(79)	[1]	2,843	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	779	[1]	(83)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(41)		(1,111)
Other Comprehensive Income (Loss), Net of Tax	738	[1]	(1,194)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	659	[1]	1,649	[1]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	495		(241)
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	987	[1]	3,418	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	717	[1]	161	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(18)		(1,050)
Other Comprehensive Income (Loss), Net of Tax	699	[1]	(889)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,686	[1]	2,529	[1]
Accumulated Other-than-Temporary Impairment [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(12)	[1]	(47)	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3	[1]	23	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1)		(8)
Other Comprehensive Income (Loss), Net of Tax	2	[1]	15	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(10)	[1]	(32)	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	108	[1]	428	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	29	[1]	(47)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(16)		(61)
Other Comprehensive Income (Loss), Net of Tax	13	[1]	(108)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	121	[1]	320	[1]
Accumulated Translation Adjustment [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	91	[1]	406	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	17	[1]	(220)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	[1]	0	[1]
Other Comprehensive Income (Loss), Net of Tax	17	[1]	(220)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	108	[1]	186	[1]
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,253)	[1]	(1,362)	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13	[1]	0	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(6)		8
Other Comprehensive Income (Loss), Net of Tax	7	[1]	8	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,246)	[1]	(1,354)	[1]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	41		1,111
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	28		1,616
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	28		1,616
Income tax expense (benefit)	10		566
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	18		1,050
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings	2		13
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	2		13
Income tax expense (benefit)	1		5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1		8
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	8		33
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	16		61
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	10		(12)
Income tax expense (benefit)	4		(4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	6		(8)
Other Postretirement Benefit Plans, Defined Benefit [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Cost and Expense, Operating	(2)		2
Pension Plans, Defined Benefit [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Cost and Expense, Operating	12		(14)
Retirement Plans and Individual Life Businesses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized capital gains (losses), excluding net OTTI losses recognized in earnings			1,500
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Gain (loss) on derivative instruments, net, pretax	$ 71

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