Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) agreement	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number Of Land Use Agreements | agreement	3
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other	Other	Other
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities	Other Liabilities
ROU assets, operating leases	$ 547	$ 535
Lease liabilities, operating leases	$ 555	$ 541
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other	Other	Other
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities	Other Liabilities
ROU assets, finance leases	$ 205	$ 128
Lease liabilities, finance leases	$ 200	$ 124
Weighted average incremental borrowing rate at the lease inception, operating leases	3.57%	3.81%
Weighted average incremental borrowing rate at the lease inception, finance leases	3.52%	3.50%
Weighted-average remaining lease term, operating leases	39 years	33 years
Weighted-average remaining lease term, finance leases	31 years	25 years
Expected lease payments over the remaining terms of the leases	$ 1,400
Operating Lease, Expense	92	$ 95	$ 91
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	92	121	450
Net investment in sales-type leases	42	$ 47
Operating and Sales-type Leases, Lease Receivable, Payments to be Received	$ 843
FPL [Member]
Lessee, Lease, Description [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 262
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease extension term, operating lease	20 years