Incentive Plans (Schedule of Compensation Expense for Each Type of Incentive Award) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 84	$ 119	$ 102
Income Tax Expense (Benefit)	$ 61	$ (235)	$ (276)
Restricted stock - Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (usd per share)	$ 108.24	$ 137.23	$ 180.66
Stock-based compensation expense	$ 49	$ 79	$ 65
Grant date fair value	59	99	67
Restricted stock - Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	12	19	17
Grant date fair value	16	20	$ 24
Amount of liabilities attributable to liability awards included in accounts payable	$ 7	$ 11
Performance unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (usd per share)	$ 184.06	$ 165.84	$ 246.18
Stock-based compensation expense	$ 21	$ 19	$ 18
Grant date fair value	10	22	21
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2	2	2
Compensation Expense For Incentive Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income Tax Expense (Benefit)	$ 7	$ 18	$ 17

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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