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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenues $ 10,696 $ 10,270 $ 32,052 $ 30,849
Equity in earnings of affiliates 13 22 36 44
Adjusted segment EBITDA 1,776 1,957 5,871 6,012
Depreciation and amortization 539 495 1,581 1,463
Interest expense 427 432 1,257 1,275
Gains on sales of facilities (7) (3) (10) (8)
Losses on retirement of debt 39 4 39 4
Legal claim costs   11   33
Income before income taxes 778 1,018 3,004 3,245
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,036 4,882 15,344 14,780
Equity in earnings of affiliates (8) (13) (17) (17)
Adjusted segment EBITDA 975 1,073 3,268 3,342
Depreciation and amortization 219 204 650 602
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,180 4,908 15,268 14,554
Equity in earnings of affiliates (9) (9) (27) (26)
Adjusted segment EBITDA 930 1,016 2,977 3,002
Depreciation and amortization 251 231 727 675
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 480 480 1,440 1,515
Equity in earnings of affiliates 4   8 (1)
Adjusted segment EBITDA (129) (132) (374) (332)
Depreciation and amortization $ 69 $ 60 $ 204 $ 186