Bank Financing and Debt Additional Disclosures (Details) - Senior Debt [Member] - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Debt Instruments [Line Items]
Face value of debt	$ 8,940	$ 8,940
Maximum [Member]
Debt Instruments [Line Items]
Stated interest rate	7.875%
Minimum [Member]
Debt Instruments [Line Items]
Stated interest rate	1.95%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant