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Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures to Consolidated Statements of Cash Flows - Cash flow changes, reconciliation of components of cash (Details)

v3.10.0.1
Supplemental Disclosures to Consolidated Statements of Cash Flows - Cash flow changes, reconciliation of components of cash (Details)
$ in Millions
1 Months Ended
Aug. 31, 2016
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Ìý Ìý Ìý Ìý Ìý
Cash and cash equivalents Ìý $ 358 $ 1,029 Ìý Ìý
Total cash and cash equivalents and restricted cash at end of period Ìý 452 1,047 $ 572 $ 211
Number of cash flow issues the FASB guidance addresses | item 8 Ìý Ìý Ìý Ìý
ASU No. 2016-18 - Restricted Cash Ìý Ìý Ìý Ìý Ìý
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Ìý Ìý Ìý Ìý Ìý
Cash and cash equivalents Ìý 358 1,029 $ 562 Ìý
Restricted cash included in other current assets Ìý $ 70 $ 8 Ìý Ìý
Restricted cash, current - location Ìý us-gaap:OtherCurrentAssetsMember us-gaap:OtherCurrentAssetsMember us-gaap:OtherCurrentAssetsMember Ìý
Restricted cash included in other assets Ìý $ 24 $ 10 $ 10 Ìý
Restricted cash, noncurrent - location Ìý us-gaap:OtherAssetsMember us-gaap:OtherAssetsMember us-gaap:OtherAssetsMember Ìý
Total cash and cash equivalents and restricted cash at end of period Ìý $ 452 $ 1,047 $ 572 Ìý