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Long-Term Debt and Revolving Credit Arrangements - Narrative (Details)		1 Months Ended
	Aug. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) day $ / shares Rate	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Feb. 25, 2021 USD ($)	Sep. 30, 2020 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	$ 14,056,000,000	$ 14,175,000,000	$ 13,598,000,000		$ 9,633,000,000	$ 10,239,000,000	$ 12,028,000,000	$ 14,872,000,000
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Decrease to additional paid-in capital		(243,000,000)
Additional Paid-In Capital
Debt Instrument [Line Items]
Decrease to additional paid-in capital		35,931,000,000	37,281,000,000	$ 35,588,000,000	$ 36,182,000,000		$ 31,549,000,000	$ 31,267,000,000	$ 31,035,000,000	$ 30,739,000,000
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Decrease to additional paid-in capital		(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
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 ratio | Rate		1.23701%
Conversion price (in dollars per share) | $ / shares		$ 80.84
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 | day		20
Threshold consecutive trading days | day		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 | day		5
Threshold consecutive trading days | day		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			1,100,000,000
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	763,000,000
Letters of credit outstanding that will reduce the available credit under facilities		$ 233,000,000	263,000,000
Senior Note | Level 2
Debt Instrument [Line Items]
Fair Value of long-term debt			6,037,000,000
Senior Note | 2029 Senior Note
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,500,000,000
Stated interest rate	4.50%
Redemption price (in percent)	1.00%
Debt instrument term (in years)	8 years
Debt issuance cost	$ 16,000,000
Senior Note | 2029 Senior Note | Level 2
Debt Instrument [Line Items]
Fair Value of long-term debt			1,511,000,000
Senior Note | 2027 Senior Note | Level 2
Debt Instrument [Line Items]
Fair Value of long-term debt			$ 1,323,000,000

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