Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 594	$ 541	$ 1,542	$ 1,776
Other Comprehensive Income (Loss), Net of Tax
Change in Unrealized Appreciation of Investments	(46)	(3)	427	(699)
Change in Postretirement Benefit Costs Not Yet Recognized in Net Income	6	15	17	46
Foreign Currency Translation Losses	(26)	(41)	(41)	(63)
Total Other Comprehensive Income (Loss) Net of Tax	(66)	(29)	403	(716)
Comprehensive Income	$ 528	$ 512	$ 1,945	$ 1,060