Debt (Narrative) (Details) - USD ($) | Oct. 14, 2021 | Sep. 17, 2019 | Dec. 31, 2021 | Dec. 31, 2021 | Jan. 01, 2021 | Jul. 02, 2021 | Jan. 13, 2021 | Dec. 08, 2020 | Jun. 18, 2020 | Jun. 10, 2020 | Sep. 18, 2019 | Feb. 20, 2019 | Feb. 03, 2017 | May 14, 2015 | Dec. 02, 2014 | May 28, 2014 | May 22, 2013 |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Amount of borrowings drawn | | | $ 0 | | | | | | | | | | | | | | |
Repayments of Long-term Debt | | | | $ 481,000,000 | $ 21,000,000 | | | | | | | | | | | | |
Less: current portion of debt | | | (235,000,000) | (235,000,000) | | $ (245,000,000) | | | | | | | | | | | |
Long-term Debt, Excluding Current Maturities | | | 5,626,000,000 | 5,626,000,000 | | 4,894,000,000 | | | | | | | | | | | |
Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Long-term debt, gross | | | 5,895,000,000 | 5,895,000,000 | | 5,173,000,000 | | | | | | | | | | | |
Debt issuance costs | | | (34,000,000) | (34,000,000) | | (34,000,000) | | | | | | | | | | | |
Debt, net of debt issuance costs | | | 5,861,000,000 | 5,861,000,000 | | 5,139,000,000 | | | | | | | | | | | |
Less: current portion of debt | | | (235,000,000) | (235,000,000) | | (245,000,000) | | | | | | | | | | | |
Long-term Debt, Excluding Current Maturities | | | 5,626,000,000 | 5,626,000,000 | | 4,894,000,000 | | | | | | | | | | | |
Senior Notes 4.25 Percent Due March 2022 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 220,000,000 | 220,000,000 | | 220,000,000 | | | | | | | | | | | |
Senior Notes 4.75 Percent Due June 2023 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 541,000,000 | 541,000,000 | | 541,000,000 | | | | | | | | | | | |
Senior Notes 4.875 Percent Due March 2024 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 499,000,000 | 499,000,000 | | 499,000,000 | | | | | | | | | | | |
Senior Notes 4.75 Percent Due January 2025 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 479,000,000 | 479,000,000 | | 479,000,000 | | | | | | | | | | | |
Senior Notes 4.875 percent Due June 2027 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 504,000,000 | 504,000,000 | | 504,000,000 | | | | | | | | | | | |
Senior note 5.75 percent due December 2034 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 489,000,000 | 489,000,000 | | 489,000,000 | | | | | | | | | | | |
Senior note 4.091 percent due June 2029 | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 463,000,000 | 463,000,000 | | 461,000,000 | | | | | | | | | | | |
Senior note 5.75 percent due December 2034 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 500,000,000 | 500,000,000 | | 499,000,000 | | | | | | | | | | | |
Senior note 3.125 percent due July 2029 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 500,000,000 | 500,000,000 | | 500,000,000 | | | | | | | | | | | |
Senior Notes 3.375 Percent due July 2031 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 500,000,000 | 500,000,000 | | 500,000,000 | | | | | | | | | | | |
LIBOR based Term Loan Due September 2025 [Member] | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 0 | 0 | | $ 481,000,000 | | | | | | | | | | | |
Term Loan A1 | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | 600,000,000 | 600,000,000 | | | | | | | | | | | | | |
Term Loan A2 | Reported Value Measurement [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Senior Notes | | | $ 600,000,000 | $ 600,000,000 | | | | | | | | | | | | | |
2019 Revolving Credit Facility | Revolving Credit Facility | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | $ 1,750,000,000 | | | | | | $ 1,725,000,000 | | | | | | | | | | |
Term Loan | Revolving Credit Facility | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Redemption price | | 1.25% | | | | | | | | | | | | | | | |
Term Loan | Term Loan | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | | | | | | | | | | | | $ 500,000,000 | | | | | |
Amount of borrowings drawn | | $ 500,000,000 | | | | | | | | | | | | | | | |
Line of Credit Facility, Repayment | 475,000,000 | | | | | | | | | | | | | | | | |
Senior Notes | Senior Notes 4.25 Percent Due March 2022 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | | | $ 750,000,000 | | | | |
Stated interest rate (as a percent) | | | | | | | | | | | | | 4.25% | | | | |
Amount of debt repurchased | | | | | | | | | | | $ 9,000,000 | | | | | | |
Senior Notes | Senior Notes 4.75 Percent Due June 2023 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | | | | | | | $ 1,000,000,000 |
Stated interest rate (as a percent) | | | | | | | | | | | | | | | | | 4.75% |
Amount of debt repurchased | | | | | | | | | | | $ 5,000,000 | | | | | | |
Gain (loss) on repurchase of debt instrument | | | | | $ 1,000,000 | | | | | | | | | | | | |
Senior Notes | Senior Notes 4.875 Percent Due March 2024 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | | | $ 500,000,000 | | | | |
Stated interest rate (as a percent) | | | | | | | | | | | | | 4.875% | | | | |
Senior Notes | Senior Notes 4.75 Percent Due January 2025 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | | | | | | $ 1,000,000,000 | |
Stated interest rate (as a percent) | | | | | | | | | | | | | | | | 4.75% | |
Senior Notes | Senior Notes 4.875 percent Due June 2027 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | | | | $ 700,000,000 | | | |
Stated interest rate (as a percent) | | | | | | | | | | | | | | 4.875% | | | |
Senior Notes | Senior note 5.75 percent due December 2034 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | | | | | $ 500,000,000 | | |
Stated interest rate (as a percent) | | | | | | | | | | | | | | | 5.75% | | |
Senior Notes | Senior note 4.091 percent due June 2029 | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | $ 500,000,000 | | | | | | | | |
Stated interest rate (as a percent) | | | | | | | | | 4.091% | | | | | | | | |
Senior Notes | Senior note 5.75 percent due December 2034 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | $ 500,000,000 | | | | | | | |
Stated interest rate (as a percent) | | | | | | | | | | 4.125% | | | | | | | |
Senior Notes | Senior note 3.125 percent due July 2029 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | $ 500,000,000 | | | | | | | | | |
Stated interest rate (as a percent) | | | | | | | | 3.125% | | | | | | | | | |
Senior Notes | Senior Notes 3.375 Percent due July 2031 [Member] | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | $ 500,000,000 | | | | | | | | | |
Stated interest rate (as a percent) | | | | | | | | 3.375% | | | | | | | | | |
Term Loan A1 | Term Loan | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | 600,000,000 | | | | | | | | | | | | | | | | |
Term Loan A2 | Term Loan | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | 600,000,000 | | | | | | | | | | | | | | | | |
October 2021 Term Loan | Term Loan | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | 1,200,000,000 | | | | | | | | | | | | | | | | |
October 2021 Term Loan A2 | Term Loan | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Line of credit facility, maximum borrowing capacity | $ 600,000,000 | | | | | | | | | | | | | | | | |
Minimum | 2019 Revolving Credit Facility | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.125% | | | | | | | | | | | | | | | | |
Minimum | Term Loan A1 | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.125% | | | | | | | | | | | | | | | | |
Minimum | Term Loan A2 | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.25% | | | | | | | | | | | | | | | | |
Maximum | 2019 Revolving Credit Facility | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.375% | | | | | | | | | | | | | | | | |
Maximum | Term Loan A1 | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.375% | | | | | | | | | | | | | | | | |
Maximum | Term Loan A2 | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.50% | | | | | | | | | | | | | | | | |