Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Comprehensive Income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 798	$ 176	$ (38)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	1,805	(2,746)	1,554
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax	1,007	(2,922)	1,592
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax	1,383	(2,431)	1,907
Accumulated Other-than-Temporary Impairment [Member]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax	7	35	52
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax	42	(320)	(88)
Accumulated Translation Adjustment [Member]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax	(99)	(315)	(168)
Accumulated Defined Benefit Plans Adjustment [Member]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax	$ (326)	$ 109	$ (111)