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Background and Summary of Significant Accounting Policies - Effect of 2016-02 (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment		$ (26,408)	$ (26,852)
Long-term debt		(35,409)	(37,283)
Deferred income taxes		(2,527)	(2,413)
Stockholder's equity		$ (19,828)	$ (23,491)	$ (13,399)
Subsequent event \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment	$ (409)
Deferred rent	(3)
Long-term debt	(558)
Deferred income taxes	37
Stockholder's equity	$ 115