Pension and Postretirement Benefit Plans - Pension Asset Fair Value Level 3 (Details) - International Qualified and Non-qualified Pension Benefits - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Benefit Plan Information
Foreign currency exchange	$ (444)	$ (498)
Level 3
Benefit Plan Information
Foreign currency exchange	(9)	(36)
Defined benefit plan increases related to net purchases and unrealized gains losses	$ 8	$ 16

The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration