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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Revenues $ 11,451 $ 10,696 $ 34,403 $ 32,052
Equity in earnings of affiliates 9 13 25 36
Adjusted segment EBITDA 2,096 1,776 6,441 5,871
Depreciation and amortization 582 539 1,697 1,581
Interest expense 442 427 1,309 1,257
Gain on sales of facilities (6) (7) (420) (10)
Losses on retirement of debt 9 39 9 39
Income before income taxes 1,069 778 3,846 3,004
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,542 5,036 16,719 15,344
Equity in earnings of affiliates (1) (8) (5) (17)
Adjusted segment EBITDA 1,127 975 3,593 3,268
Depreciation and amortization 245 219 702 650
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,396 5,180 16,113 15,268
Equity in earnings of affiliates (10) (9) (29) (27)
Adjusted segment EBITDA 1,072 930 3,250 2,977
Depreciation and amortization 258 251 765 727
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 513 480 1,571 1,440
Equity in earnings of affiliates 2 4 9 8
Adjusted segment EBITDA (103) (129) (402) (374)
Depreciation and amortization $ 79 $ 69 $ 230 $ 204