Income Taxes - Net operating loss and credit carryforwards (Details) $ in Millions	Dec. 31, 2016 USD ($)
No Expiration \| Non-U.S.
Operating loss and credit carryforward
Non-U.S. net operating loss	$ 182
Expiration through 2036
Operating loss and credit carryforward
State net operating loss and tax credits, net of tax benefits, expiring through 2036	127
Expiration through 2036 \| Non-U.S.
Operating loss and credit carryforward
Non-U.S. net operating loss	65
Expiration through 2034 \| Business Acquisitions 2014
Operating loss and credit carryforward
U.S. federal net operating losses	$ 193

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319

Name:	us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant