Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 2,619	$ 2,582	$ 7,838	$ 7,665
Income before income taxes	652	688	1,634	1,889
Net income	585	560	1,416	1,545
Non- U.S.
Segment Reporting Information [Line Items]
Total revenue	1,173	1,181	3,470	3,454
Income before income taxes	341	385	1,033	987
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,446	1,401	4,368	4,211
Income before income taxes	$ 311	$ 303	$ 601	$ 902