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Stock Incentive Plans - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future awards (in shares)	11,000
Accelerated vesting period	1 year
Allocated share-based compensation expense	$ 145	$ 135	$ 148
Income tax benefit recognized	34	50	67
Fair value of restricted stock and restricted stock units	209	$ 174	$ 147
Unrecognized compensation cost related to non-vested share	$ 265
Weighted-average period	2 years 4 months
Employee stock purchase plan issued (in shares)	256	258	236
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, years	3 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, years	5 years
Restricted Stock Units Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, years	1 year
Restricted Stock Units Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, years	3 years

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Share-based Compensation Arrangement by Share-based Payment Award, Award Accelerated Vesting Period

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of shares issued during the period as a result of an employee stock purchase plan.

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