Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	7.83%	7.83%	7.83%
Swiss federal income tax rate at 7.83%	$ (164)	$ (20)	$ (13)
Tax on operating earnings subject to rates different than the Swiss federal income tax rate	(411)	70	(89)
Tax on divestitures gains subject to different tax rate	0	109	0
Non-cash tax expense on distribution of subsidiary earnings	(265)	0	0
Change in valuation allowance	159	222	264
Change in uncertain tax positions	6	(97)	(18)
(Provision) Benefit for Income Taxes	$ 145	$ (284)	$ (144)