Stock-based Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) Offering_Period $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Proceeds from issuance of common stock \| $	$ 87	$ 118	$ 195
Stock Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation cost \| $	218	257	274
Tax benefit \| $	(35)	(48)	(51)
Stock-based compensation cost, net of tax \| $	$ 183	$ 209	223
Number of shares reserved for issuance to recipient (in shares)	247.0
Number of shares available for future grant (in shares)	23.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Expiration from date of award (in years)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period	25.3
Granted	2.2
Forfeited/expired	(1.6)
Outstanding at end of period	25.9	25.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding- weighted average exercise price at beginning of period (in dollars per share) \| $ / shares	$ 41.58
Granted \| $ / shares	24.59
Forfeited/expired \| $ / shares	37.87
Outstanding- weighted average price per share end of period (in dollars per share) \| $ / shares	$ 40.36	$ 41.58
Weighted Average Remaining Contractual Term (years)	5 years 4 months 24 days
Aggregate Intrinsic Value \| $	$ 0
Number of shares exercisable at the end of the period	19.7
Weighted Average Exercise Price per Share, Exercisable at the end of the period \| $ / shares	$ 44.29
Weighted Average Remaining Contractual Term (years), Exercisable at the end of the period	4 years 6 months
Aggregate Intrinsic Value, Exercisable at the end of the Period \| $	$ 0
Intrinsic value of stock options exercised during the period \| $	7	$ 2	25
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Unrecognized compensation cost, non vested awards at period end \| $	$ 20
Weighted average period unrecognized compensation costs to be recognized (in years)	2 years
Proceeds from issuance of common stock \| $	$ 87	$ 118	$ 195
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	5 years 4 months 20 days	5 years 3 months 21 days	5 years 3 months 7 days
Expected volatility	33.00%	31.00%	28.00%
Weighted average grant-date fair value of option \| $ / shares	$ 5.41	$ 5.91	$ 11.56
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend yield	2.25%	1.37%	1.28%
Risk-free interest rate	1.35%	2.27%	1.79%
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected dividend yield	3.88%	2.29%	1.72%
Risk-free interest rate	2.51%	2.84%	2.14%
Exercise of stock options [Member]
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Proceeds from issuance of common stock \| $	$ 0	$ 6	$ 88
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares reserved for issuance to recipient (in shares)	74.0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility	68.00%	34.00%	25.00%
Expected dividend yield	4.89%	3.06%	1.62%
Risk-free interest rate	0.65%	2.20%	1.92%
Weighted average grant-date fair value of option \| $ / shares	$ 3.18	$ 5.22	$ 8.86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Shares available for future issuance through the plan	9.0
Employee Stock Purchase Plan [Abstract]
Percentage of earnings eligible employees may have withheld under the employee stock purchase plan	10.00%
Number of offering periods \| Offering_Period	4
Number of months each offering period lasts beginning January 1 and July 1 each year (in months)	3 months
Percentage of the lower of fair market value of the unit on the commencement date or the fair market value of unit on the last trading day of the offering period	90.00%
Number of shares sold through the plan (in shares)	65.0
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares at the beginning of the period	18.1
Granted	8.2
Vested	(5.4)
Forfeited	(1.9)
Non vested shares at the end of the period	19.0	18.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant-Date Fair Value per Share, Non vested shares at the beginning of the period \| $ / shares	$ 34.72
Granted \| $ / shares	16.53	$ 24.75	$ 47.43
Vested \| $ / shares	36.97
Forfeited \| $ / shares	33.66
Weighted Average Grant-Date Fair Value Per Share, Nonvested shares at the end of the period \| $ / shares	$ 26.26	$ 34.72
Total fair value of shares vested during the period \| $	$ 79	$ 107	$ 219
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Expiration from date of award (in years)	5 years
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Unrecognized compensation cost, non vested awards at period end \| $	$ 330
Weighted average period unrecognized compensation costs to be recognized (in years)	3 years

The cumulative number of shares sold through the plan as of the balance sheet date.

No definition available.

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-- None. No documentation exists for this element. --

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This element represents the number of months that each offering period lasts beginning on January 1 and July 1 of each fiscal year.

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Reflects the dating as to when the share-based award expires in relation to the grant date, as specified in the award agreement.

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No definition available.

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Share-based Compensation Arrangement By Share Based Payment Award Number Of Offering Periods

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Shares available for future issuance through the Employee Stock Purchase Plan.

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

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Amount, after tax, of expense for award under share-based payment arrangement.

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No definition available.

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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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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on offering date that participants pay for shares.

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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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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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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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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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No definition available.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of 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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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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