Stock Plans (RSU Awards) (Details) - Restricted Stock Units (RSUs) [Member] $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) year $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Granted (in shares) \| shares	1,599,380	1,621,070
Weighted-Average Grant Date Fair Value Per RSU Award Granted (in dollars per share) \| $ / shares	$ 86.62	$ 77.13
Compensation Expense Related to Awards	$ 39	$ 36
Unrecognized compensation cost related to non-vested stock awards	$ 218
Award requisite service period	3 years
Minimum retirement age \| year	58
Stock awards vested during period (in shares) \| shares	1,011,318
Grant Date Fair Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested stock awards	$ 99
Total Fair Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested stock awards	$ 88

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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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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