Commitments, Guarantees and Contingencies Aggregate Minimum Rentals (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
2016		$ 56
2017		54
2018		45
2019		33
2020		26
Thereafter		63
Total	[1]	277
Operating lease expense		$ 67	$ 85	$ 85

[1] Minimum payments have not been reduced by minimum sublease rentals due in the future under noncancelable subleases.