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Segment and Geographic Information - Schedule of Geographic Distributions of Revenues, Equity in Earnings of Affiliates, Adjusted Segment EBITDA, Depreciation and Amortization and Assets (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Revenues $ 12,861 $ 12,517
Equity in earnings of affiliates (7) (11)
Adjusted segment EBITDA 2,200 2,541
Depreciation and amortization 674 619
Interest expense 428 461
Losses (gains) on sales of facilities (7) 1
Losses on retirement of debt 295 0
Income before income taxes 810 1,460
National Group [Member]    
Segment Reporting Information [Line Items]    
Revenues 6,474 6,317
Equity in earnings of affiliates 1 (2)
Adjusted segment EBITDA 1,215 1,454
Depreciation and amortization 306 265
American Group [Member]    
Segment Reporting Information [Line Items]    
Revenues 5,744 5,595
Equity in earnings of affiliates (9) (11)
Adjusted segment EBITDA 1,115 1,141
Depreciation and amortization 287 281
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Revenues 643 605
Equity in earnings of affiliates 1 2
Adjusted segment EBITDA (130) (54)
Depreciation and amortization $ 81 $ 73