Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 2,484	$ 2,600
Income before income taxes	430	499
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,025	1,147
Income before income taxes	176	342
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,459	1,453
Income before income taxes	$ 254	$ 157