Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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%	$ 225	$ 164	$ 20
Tax on operating earnings subject to rates different than the Swiss federal income tax rate	319	411	(70)
Tax on divestitures gains subject to different tax rate	0	0	109
Non-cash tax expense on distribution of subsidiary earnings	137	265	0
Change in valuation allowance	(872)	(159)	(222)
Change in uncertain tax positions	31	6	(97)
(Provision) Benefit for Income Taxes	$ (496)	$ 145	$ (284)