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Equity - Summary of Company Expenses Compensation Costs Based on Grant Date Fair Value (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Options Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 30	$ 46	$ 74
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	99	73	81
Omnibus Long Term Share Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	129	119	155
Tax effect on stock-based compensation expense	14	14	18
Net effect	$ 115	$ 105	$ 137

X

- Definition

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

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