Commitments, Guarantees and Contingencies (Aggregate minimum rental payments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
2015	$ 83
2016	70
2017	66
2018	58
2019	47
Thereafter	99
Total	423	[1]
Operating lease expense	$ 85		$ 85	$ 84

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