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Stockholders' Equity - New Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ 31,838	$ 34,086	$ 34,531	$ 35,124
Impact of Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity			(4)	66
Accumulated deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	(9,936)	(7,693)	(7,716)	(7,754)
Accumulated deficit | Impact of Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity			(4)	175
Accumulated other comprehensive loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ (407)	$ (333)	$ (330)	(541)
Accumulated other comprehensive loss | Impact of Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity				(109)
Accounting Standards Update 2017-05 | Accumulated deficit | Impact of Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity				66
Accounting Standards Update 2018-02 | Accumulated deficit | Impact of Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity				109
Accounting Standards Update 2018-02 | Accumulated other comprehensive loss | Impact of Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity				$ (109)

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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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