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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, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Revenues $ 11,423 $ 10,623
Equity in earnings of affiliates 9 10
Adjusted segment EBITDA 2,118 2,005
Depreciation and amortization 553 521
Interest expense 431 419
Gains on sales of facilities (405) (1)
Income before income taxes 1,539 1,066
National Group [Member]    
Segment Reporting Information [Line Items]    
Revenues 5,568 5,148
Equity in earnings of affiliates (2) (5)
Adjusted segment EBITDA 1,182 1,131
Depreciation and amortization 225 214
American Group [Member]    
Segment Reporting Information [Line Items]    
Revenues 5,327 4,995
Equity in earnings of affiliates (9) (8)
Adjusted segment EBITDA 1,031 1,007
Depreciation and amortization 252 238
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Revenues 528 480
Equity in earnings of affiliates 2 3
Adjusted segment EBITDA (95) (133)
Depreciation and amortization $ 76 $ 69