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Debt (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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May 13, 2021 USD ($) $ / shares | May 07, 2021 USD ($) | Sep. 14, 2020 USD ($) | May 26, 2020 USD ($) $ / shares | Mar. 10, 2020 USD ($) | Mar. 05, 2020 USD ($) $ / shares | Feb. 04, 2020 USD ($) $ / shares | Jan. 31, 2020 USD ($) $ / shares | Nov. 11, 2019 USD ($) $ / shares | Nov. 04, 2019 USD ($) | Apr. 02, 2021 USD ($) seniorNote $ / shares | Apr. 03, 2020 USD ($) $ / shares | Mar. 29, 2019 USD ($) $ / shares | Sep. 15, 2020 USD ($) | Feb. 09, 2017 USD ($) | Aug. 01, 2016 USD ($) | Mar. 04, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 3,601,000,000 | $ 4,221,000,000 |  |  |  |  |
Debt, gross |  |  |  |  |  |  |  |  |  |  | 3,620,000,000 | 4,250,000,000 |  |  |  |  |
Special dividend (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |
Extinguishment of debt with borrowings from the same creditors |  |  |  |  |  |  |  |  |  |  | 0 | 1,073,000,000 | $ 0 |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 20,000,000 | 0 | 0 |  |  |  |
Payment for debt extinguishment |  |  |  |  |  |  |  |  |  |  | 0 | 546,000,000 | 0 |  |  |  |
Payment of accrued interest |  |  |  |  |  |  |  |  |  |  | $ 139,000,000 | 179,000,000 | 183,000,000 |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 21.42 |  |  |  |  |  |
Term Loan due November 4, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Delayed Term Loan due November 4, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |
Amount drawn from credit agreement |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly installment payment (as a percent) |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |
First Amendment Additional Term Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  | $ 525,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement, First Amendment | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly installment payment (as a percent) |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  | 5.25 |  |  |  |  |  |  |
Leverage ratio if acquisition incurred |  |  |  |  |  |  |  |  |  | 5.75 |  |  |  |  |  |  |
Aggregate acquisition amount benchmark |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instrument | seniorNote |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Senior Notes | 5.0% Senior Notes due April 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, gross |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 | 1,100,000,000 |  |  | $ 1,100,000,000 |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |
Senior Notes | 4.20% Senior Notes due September 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |
Debt, gross |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 750,000,000 |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.20% | 4.20% |  | 4.20% |  |  |
Senior Notes | 3.95% Senior Notes due June 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, gross |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 400,000,000 |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.95% |  |  |  | 3.95% |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Conversion period prior to maturity dates |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Payments in lieu of conversion price adjustments |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 | $ 11,000,000 | $ 0 |  |  |  |
Convertible Debt | 2.5% Convertible Senior Notes due April 1, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Stated interest rate (as a percent) |  |  |  |  | 2.50% |  | 2.50% |  | 2.50% |  |  |  |  |  |  |  | 2.50%
Extinguishment of debt with borrowings from the same creditors |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 8.40 | $ 16.77 |  |  |  |
Convertible Debt | 2.0% Convertible Senior Notes due August 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |
Stated interest rate (as a percent) |  |  |  | 2.00% |  |  | 2.00% |  | 2.00% |  |  |  |  |  |  | 2.00% |
Extinguishment of debt with borrowings from the same creditors |  |  |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 10.23 | $ 20.41 |  |  |  |
Payment for debt extinguishment |  |  |  | $ 1,176,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange and extinguishment of convertible notes, equity adjustment |  |  |  | 578,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | New 2.5% Convertible Senior Notes due April 1, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 250,000,000 | $ 249,000,000 |  |  |  |  |
Debt, gross |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 | $ 250,000,000 |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 2.50% | 2.50% |  | 2.50% |  | 2.50% |  |  |  |  |  |
Cash notes payments per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 0.0596341 | 0.1189814 |  |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  |  |  |  |  | $ 19 | $ 16.77 | $ 8.40 |  |  | $ 16.77 | $ 16.77 |  |  |  |  |
Cash note payments |  |  |  |  |  |  | $ 179,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ (1,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment |  |  |  |  |  | $ 566,000,000 |  |  |  |  |  |  |  |  |  |  |
Payment of accrued interest |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments in lieu of conversion price adjustments |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Exchange and extinguishment of convertible notes, equity adjustment |  |  |  |  | $ 316,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, if-converted, value in excess of principal |  |  |  |  |  |  |  |  |  |  | $ 69,000,000 |  |  |  |  |  |
Convertible Debt | New 2.5% Convertible Senior Notes due April 1, 2022 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares | $ 16.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment | $ 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | New 2.0% Convertible Senior Notes due August 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  | $ 625,000,000 |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 620,000,000 | $ 616,000,000 |  |  |  |  |
Debt, gross |  |  |  |  |  |  |  |  |  |  | $ 625,000,000 | $ 625,000,000 |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 2.00% |  |  | 2.00% |  | 2.00% |  | 2.00% |  |  |  |  |  |
Cash notes payments per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 0.0489860 | 0.0977364 |  |  |  |  |  |  |  |  |
Conversion price (in USD per share) | $ / shares |  |  |  | $ 19.25 |  |  | $ 20.41 | $ 10.23 |  |  | $ 20.41 | $ 20.41 |  |  |  |  |
Cash note payments |  |  |  |  |  |  | $ 367,000,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of accrued interest |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, if-converted, value in excess of principal |  |  |  |  |  |  |  |  |  |  | $ 31,000,000 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |
Minimum | Base Rate | 2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.125% |  |  |  |  |  |  |
Minimum | LIBOR | 2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.125% |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | 2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee( as a percent) |  |  |  |  |  |  |  |  |  | 0.125% |  |  |  |  |  |  |
Maximum | Base Rate | 2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Maximum | LIBOR | 2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | 2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee( as a percent) |  |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |

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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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