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Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect decrease to beginning retained earnings	$ (33,287)	$ (34,595)	$ (2,394)	$ (2,293)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect decrease to beginning retained earnings		45
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect decrease to beginning retained earnings	$ (12,875)	(12,528)	$ (11,860)	$ (11,635)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect decrease to beginning retained earnings		45
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect decrease to beginning retained earnings		$ 45

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
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-Name Accounting Standards Codification
-Topic 810
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 45
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