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Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 10,280	$ 10,098	$ 10,118
RETAINED EARNINGS (ACCUMULATED DEFICIT)
Accounting Policies [Abstract]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 230	$ 48	$ 68		$ 67
Cumulative Effect Of New Accounting Principle In Period Of Adoption, Tax				$ (1)	(1)
Cumulative Effect, Period of Adoption, Adjustment \| RETAINED EARNINGS (ACCUMULATED DEFICIT)
Accounting Policies [Abstract]
Cumulative effect of new accounting principle in period of adoption, net of tax					$ 3

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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