Information Relating to the Consolidated Statement of Cash Flows (Details 1) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Item Effected [Line Items]
Distributions less than income from equity affiliates	[1]	$ (2,526)	$ (2,284)
Accounting Standards Update 2016-15
Item Effected [Line Items]
Distributions less than income from equity affiliates			$ 162

[1] 2017 adjusted to conform to Accounting Standards Update 2016-15. Refer to Note 4, "Information Relating to the Consolidated Statement of Cash Flows" beginning on page 8.