Short And Long-Term Debt Indebtedness Table (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020		May 05, 2020	Dec. 31, 2019	Feb. 28, 2018
Principal Amount
Long-term debt principal amount		$ 4,030,000,000
Unamortized Discount and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		27,000,000
Net Amount
Outstanding borrowings, long-term debt		$ 4,003,000,000
LIBOR
Net Amount
Description of variable interest rate basis		LIBOR
ABR
Net Amount
Description of variable interest rate basis		ABR
Term Loan B | LIBOR
Net Amount
Debt Instrument, Basis Spread on Variable Rate		2.25%
Debt Instrument, Basis Spread on Variable Rate, Floor		0.75%
Term Loan B | ABR
Net Amount
Debt Instrument, Basis Spread on Variable Rate		1.25%
Debt Instrument, Basis Spread on Variable Rate, Floor		1.75%
Secured Debt | Term Loan B
Principal Amount
Long-term debt principal amount		$ 1,056,000,000	[1]		$ 1,058,000,000	$ 1,080,000,000
Unamortized Discount and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[1]	13,000,000
Net Amount
Outstanding borrowings, long-term debt		$ 1,043,000,000	[1]		1,045,000,000
Annual percentage of original principal amount for quarterly amortization payments		1.00%
Secured Debt | Term Loan A
Principal Amount
Long-term debt principal amount		$ 712,000,000	[2]		717,000,000	$ 750,000,000
Unamortized Discount and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	[2]	3,000,000
Net Amount
Outstanding borrowings, long-term debt		$ 709,000,000	[2]		714,000,000
Secured Debt | 2018 | Term Loan A
Net Amount
Annual percentage of original principal amount for quarterly amortization payments		2.50%
Secured Debt | 2019 | Term Loan A
Net Amount
Annual percentage of original principal amount for quarterly amortization payments		2.50%
Secured Debt | 2020 | Term Loan A
Net Amount
Annual percentage of original principal amount for quarterly amortization payments		5.00%
Secured Debt | 2021 | Term Loan A
Net Amount
Annual percentage of original principal amount for quarterly amortization payments		7.50%
Secured Debt | 2022 | Term Loan A
Net Amount
Annual percentage of original principal amount for quarterly amortization payments		10.00%
Secured Debt | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | Term Loan A | LIBOR
Net Amount
Debt Instrument, Basis Spread on Variable Rate		2.25%
Secured Debt | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | Term Loan A | ABR
Net Amount
Debt Instrument, Basis Spread on Variable Rate		1.25%
Senior Notes | 5.25% Senior Notes
Principal Amount
Long-term debt principal amount		$ 550,000,000			550,000,000
Unamortized Discount and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		2,000,000
Net Amount
Outstanding borrowings, long-term debt		$ 548,000,000			548,000,000
Interest Rate		5.25%
Senior Notes | 4.875% Senior Notes
Principal Amount
Long-term debt principal amount		$ 407,000,000			407,000,000
Unamortized Discount and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		2,000,000
Net Amount
Outstanding borrowings, long-term debt		$ 405,000,000			405,000,000
Interest Rate		4.875%
Senior Notes | 9.375% Senior Notes
Principal Amount
Long-term debt principal amount		$ 550,000,000			550,000,000
Unamortized Discount and Debt Issuance Costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		7,000,000
Net Amount
Outstanding borrowings, long-term debt		$ 543,000,000			543,000,000
Interest Rate		9.375%
Line of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding		$ 755,000,000	[3],[4]		190,000,000
Net Amount
Outstanding borrowings, short-term debt, line of credit facility		755,000,000	[3],[4]		190,000,000
Line of credit facility outstanding		755,000,000	[3],[4]		$ 190,000,000
Total capacity, short-term debt, line of credit facility	[4]	1,425,000,000
Line of Credit | Additional borrowing under Revolving Credit Facility
Principal Amount
Line of credit facility outstanding		400
Net Amount
Outstanding borrowings, short-term debt, line of credit facility		400
Line of credit facility outstanding		$ 400
Line of Credit | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | Revolving Credit Facility | LIBOR
Net Amount
Debt Instrument, Basis Spread on Variable Rate		2.25%
Line of Credit | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | Revolving Credit Facility | ABR
Net Amount
Debt Instrument, Basis Spread on Variable Rate		1.25%
Letter of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding		$ 56,000,000
Net Amount
Outstanding borrowings, short-term debt, line of credit facility		56,000,000
Line of credit facility outstanding		$ 56,000,000
Subsequent Event | Line of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding	[4]			$ 815,000,000
Net Amount
Outstanding borrowings, short-term debt, line of credit facility	[4]			815,000,000
Line of credit facility outstanding	[4]			815,000,000
Subsequent Event | Letter of Credit | Revolving Credit Facility
Principal Amount
Line of credit facility outstanding				57,000,000
Net Amount
Outstanding borrowings, short-term debt, line of credit facility				57,000,000
Line of credit facility outstanding				$ 57,000,000

[1] The Term Loan B provides for quarterly amortization payments totaling 1% per annum of the original principal amount. The interest rate with respect to term loans under the Term Loan B is based on, at the Company’s option, (a) adjusted LIBOR plus 2.25% (with a LIBOR floor of 0.75%) or (b) ABR plus 1.25% (with an ABR floor of 1.75%).

[2] The Term Loan A provides for quarterly amortization payments, which commenced on June 30, 2018, totaling per annum 2.5%, 2.5%, 5.0%, 7.5% and 10.0% of the original principal amount of the Term Loan A, with the balance of the Term Loan A due at maturity on February 8, 2023. The interest rates with respect to the Term Loan A are based on, at the Company's option, (a) adjusted LIBOR plus an additional margin or (b) ABR plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter's senior secured leverage ratio, the LIBOR margin was 2.25% and the ABR margin was 1.25% for the three months ended March 31, 2020.

[3] In response to the rapidly evolving COVID-19 pandemic, the Company borrowed an additional $400 million under the Revolving Credit Facility in March 2020 as a proactive measure intended to increase liquidity to support our operations and supplement available cash on hand. As of March 31, 2020, the $1,425 million Revolving Credit Facility had outstanding borrowings of $755 million, as well as $56 million of outstanding letters of credit. The Revolving Credit Facility expires in February 2023 but is classified on the balance sheet as current due to the revolving nature and terms and conditions of the facility. On May 5, 2020, the Company had $815 million in outstanding borrowings under the Revolving Credit Facility and $57 million of outstanding letters of credit.

[4] Interest rates with respect to revolving loans under the Senior Secured Credit Facility at March 31, 2020 were based on, at the Company's option, (a) adjusted London Interbank Offering Rate ("LIBOR") plus an additional margin or (b) JP Morgan Chase Bank, N.A.'s prime rate ("ABR") plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter's senior secured leverage ratio, the LIBOR margin was 2.25% and the ABR margin was 1.25% for the three months ended March 31, 2020.