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Long-Term Debt and Revolving Credit Arrangements - Narrative (Details) |  | 1 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) segment $ / shares Rate | Mar. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Feb. 25, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Decrease to additional paid-in capital |  | $ 12,967,000,000 | $ 13,598,000,000 | $ 14,175,000,000 |  | $ 10,239,000,000 | $ 12,028,000,000 | $ 14,872,000,000
Reclassification of the equity component of 2025 Convertible Notes to liability upon adoption of ASU 2020-06 |  |  | (243,000,000) |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Decrease to additional paid-in capital |  | 35,931,000,000 | 36,182,000,000 | 35,588,000,000 |  | $ 31,267,000,000 | $ 31,035,000,000 | $ 30,739,000,000
Reclassification of the equity component of 2025 Convertible Notes to liability upon adoption of ASU 2020-06 | $ (243,000,000) |  | $ (243,000,000) |  |  |  |  |
Secured Loans | Refinanced Term Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 2,600,000,000 |  |  |
Secured Loans | 2027 Refinanced Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | 1,100,000,000 |  |  |
Secured Loans | 2027 Refinanced Term Loan | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair Value of long-term debt |  |  |  | 1,100,000,000 |  |  |  |
Secured Loans | 2025 Refinanced Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 1,500,000,000 |  |  |
Secured Loans | 2025 Refinanced Term Loan | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair Value of long-term debt |  |  |  | 1,500,000,000 |  |  |  |
Senior Note | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair Value of long-term debt |  |  |  | 4,562,000,000 |  |  |  |
Convertible Notes | 2025 Convertible Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  | 1,150,000,000 |  |  |  |  |  |
Additional principal amount |  | $ 150,000,000 |  |  |  |  |  |
Stated interest rate |  | 0.00% |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 80.84 |  |  |  |  |  |
Conversion ratio | Rate |  | 1.23701% |  |  |  |  |  |
Redemption price (in percent) |  | 1.00% |  |  |  |  |  |
Interest costs capitalized |  | $ 243,000,000 |  |  |  |  |  |
Convertible Notes | 2025 Convertible Note | Debt Conversion Terms One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | segment |  | 20 |  |  |  |  |  |
Threshold consecutive trading days | segment |  | 30 |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 1.30% |  |  |  |  |  |
Convertible Notes | 2025 Convertible Note | Debt Conversion Terms Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | segment |  | 5 |  |  |  |  |  |
Threshold consecutive trading days | segment |  | 10 |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 0.98% |  |  |  |  |  |
Convertible Notes | 2025 Convertible Note | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair Value of long-term debt |  |  |  | 1,200,000,000 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  | 2,300,000,000 |  |  |  |
Line of credit balance |  |  |  | 0 |  |  |  |
Line of Credit | Letters of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 649,000,000 |  | 682,000,000 |  |  |  |
Letters of credit outstanding that will reduce the available credit under facilities |  | $ 233,000,000 |  | $ 266,000,000 |  |  |  |

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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=123466103&loc=SL6014347-161799 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 Reference 3: 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 + Details
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