Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unrecognized amounts on retirement benefits, tax	$ 13	$ (8)	$ 13	$ 11
Unrealized gains on available-for-sale securities, tax	79	105	158	136
Unrealized (losses) gains on cash flow hedges, tax	$ (5)	$ (1)	$ 8	$ 4