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Senior Notes and Other Debt (Credit Facilities and Unsecured Term Loans) (Details) $ in Billions	1 Months Ended		3 Months Ended	12 Months Ended
	Sep. 30, 2019 CAD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) period	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
Commercial paper program capacity				$ 1,000,000,000.0
Commercial paper				567,450,000	$ 0
Gain (loss) on extinguishment of debt				$ (41,900,000)	(58,254,000)	$ (754,000)
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.875%
Unsecured Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 3,000,000,000.0
Additional periods \| period				2
Debt Instrument, Term, Additional Period				6 months
Accordion Feature \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 3,750,000,000
Unsecured Term Loan Due 2023
Debt Instrument [Line Items]
Accordion feature of debt				800,000,000.0
Repayments of debt		$ 100,000,000.0
Unsecured debt		300,000,000.0	$ 300,000,000.0	$ 200,000,000	300,000,000
Unsecured Term Loan Due 2023 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.90%
Unsecured Term Loan Due 2024
Debt Instrument [Line Items]
Repayments of debt		$ 600,000,000.0
Unsecured debt				$ 0	600,000,000
Unsecured Term Loans Due 2023 and 2024
Debt Instrument [Line Items]
Unsecured debt							$ 900,000,000.0
Gain (loss) on extinguishment of debt			$ (3,200,000)
Unsecured Term Loan Due 2020
Debt Instrument [Line Items]
Unsecured debt							$ 900,000,000.0
Unsecured revolving credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding				120,787,000	765,919,000
Letters of credit outstanding				24,000,000.0
Line of credit, remaining availability less commercial paper				2,300,000,000
Secured revolving construction credit facility due 2022 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				400,000,000.0
Line of credit facility, amount outstanding				160,492,000	90,488,000
Unsecured Term Loan due 2025
Debt Instrument [Line Items]
Unsecured debt	$ 0.5			$ 385,030,000	$ 0
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.90%