Common Stock and Stock Plans, Summary of Performance Awards (Details) - Performance shares awards [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of Performance Awards [Abstract]
Nonvested at January 1, 2020 (in shares)	6,504,213
Granted (in shares)	1,509,410
Vested (in shares)	(1,146,522)
Canceled or forfeited (in shares)	(1,313,493)
Nonvested at December 31, 2020 (in shares)	5,553,608	6,504,213
Weighted- average grant-date fair value
Nonvested at January 1, 2020 (in dollars per share)	$ 49.81
Granted (in dollars per share)	40.39	$ 49.26	$ 58.62
Vested (in dollars per share)	55.79
Canceled or forfeited (in dollars per share)	52.20
Nonvested at December 31, 2020 (in dollars per share)	$ 45.45	$ 49.81
Cost amount to holders of incentive compensation share plans	$ 0
Award vesting period	3 years
Future vesting amount, minimum (percent)	0.00%
Future vesting amount option one, maximum (percent)	125.00%
Future vesting amount option two, maximum (percent)	150.00%
Unrecognized compensation cost related to nonvested awards	$ 16
Expected weighted-average period to recognize compensation costs related to awards	1 year 10 months 24 days
Fair value of awards vested	$ 35	$ 82	$ 107

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Cost amount to holders of incentive compensation share plans.

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