Incentive Stock Program - Restricted Awards and Units (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted stock awards and restricted stock units
Share Units
Awards and units outstanding (in shares)	15,952,602
Awards and units granted during period (in shares)	7,364,109
Awards and units vested during period (in shares)	(7,750,049)
Awards and units forfeited during period (in shares)	(1,103,348)
Awards and units outstanding (in shares)	14,463,314	15,952,602
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Awards and units outstanding, weighted-average grant-date fair value (in dollars per share)	$ 52.11
Awards and units granted during period, weighted-average grant-date fair value (in dollars per share)	76.17
Awards and units vested during period, weighted-average grant-date fair value (in dollars per share)	48.52
Awards and units forfeited during period, weighted-average grant-date fair value (in dollars per share)	62.28
Awards and units outstanding, weighted-average grant-date fair value (in dollars per share)	$ 65.51	$ 52.11
Fair value of awards and units vested	$ 588	$ 458	$ 348
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Total intrinsic value of options exercised	315	$ 249	$ 233
Total unrecognized compensation cost	$ 419
Total unrecognized compensation cost, recognition period	3 years

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 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Net number of non-option equity instruments granted to participants.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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