Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Basis of Presentation and Accounting Policies (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements
Shareholders' equity	$ (25,204)		$ (25,943)	$ (24,340)
Retained earnings [Member]
New Accounting Pronouncements
Shareholders' equity	$ (37,325)		(36,977)	$ (35,795)	$ (35,204)
Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Retained earnings [Member]
New Accounting Pronouncements
Shareholders' equity		$ 43	$ 43