Segment Reporting - Condensed Balance Sheets - By Segment (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 14,812	$ 14,894	$ 12,206
Liabilities	16,738	16,312	9,973
Operating Segments \| CERP
Segment Reporting Information [Line Items]
Assets	6,959	6,941	7,028
Liabilities	5,876	5,903	6,073
Operating Segments \| CGP
Segment Reporting Information [Line Items]
Assets	7,290	7,353	4,518
Liabilities	2,664	2,709	2,798
Other
Segment Reporting Information [Line Items]
Assets	1,217	1,246	1,409
Liabilities	8,263	7,758	1,157
Eliminations
Segment Reporting Information [Line Items]
Assets	(654)	(646)	(749)
Liabilities	$ (65)	$ (58)	$ (55)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19-26)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

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