Goodwill and Other Intangible Assets (Intangible Assets) - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | |
---|---|---|
Sep. 30, 2018 |
Dec. 31, 2017 |
|
Finite Lived Intangible Assets [Line Items] | ||
Goodwill | $ 1,534 | $ 1,430 |
Customer Relations And Supply Agreements [Member] | Weighted Average [Member] | ||
Finite Lived Intangible Assets [Line Items] | ||
Remaining weighted-average life | 11 years | |
Favorable leasehold arrangements, net [Member] | Weighted Average [Member] | ||
Finite Lived Intangible Assets [Line Items] | ||
Remaining weighted-average life | 13 years | |
Noncompete Agreements | Weighted Average [Member] | ||
Finite Lived Intangible Assets [Line Items] | ||
Remaining weighted-average life | 10 years | |
Deferred Loan Origination Costs | Weighted Average [Member] | ||
Finite Lived Intangible Assets [Line Items] | ||
Remaining weighted-average life | 4 years |