Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Comprehensive Income
Net Income (Loss) Attributable to Parent	$ 378	$ 323
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	378	323
Other Comprehensive Income (Loss), Net of Tax	130	583
Total comprehensive income	508	906
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Comprehensive Income
Other Comprehensive Income (Loss), Net of Tax	137	522
Accumulated Other-than-Temporary Impairment [Member]
Comprehensive Income
Other Comprehensive Income (Loss), Net of Tax	(1)	(8)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Comprehensive Income
Other Comprehensive Income (Loss), Net of Tax	(18)	54
Accumulated Translation Adjustment [Member]
Comprehensive Income
Other Comprehensive Income (Loss), Net of Tax	2	6
Accumulated Defined Benefit Plans Adjustment [Member]
Comprehensive Income
Other Comprehensive Income (Loss), Net of Tax	$ 10	$ 9