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Information Relating to the Consolidated Statement of Cash Flows (Details2) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and Cash Equivalents $ 6,466 $ 4,813 $ 6,983 $ 6,988
Total Cash, Cash Equivalents and Restricted Cash [1] 7,517 5,943 8,073 8,414
Prepaid expenses and other current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted Cash 316 405 306 488
Deferred charges and other assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted Cash $ 735 $ 725 $ 784 $ 938
[1] 2017 adjusted to conform to Accounting Standards Update 2016-18. Refer to Note 4, "Information Relating to the Consolidated Statement of Cash Flows" beginning on page 8.