Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives [Abstract]
Derivative Assets	$ 2,386	$ 1,919
Derivatives [Abstract]
Derivative Liabilities	1,340	1,191
Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	363	486
Special use funds [Abstract]
Equity securities	3,963	3,046
U.S. Government and municipal bonds	717	604
Corporate debt securities	748	728
Mortgage-backed securities	517	478
Other debt securities	117	146
Other Investments [Abstract]
Equity securities	46	24
Debt securities	151	126
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	363	486
Special use funds [Abstract]
Equity securities	1,875	1,445
U.S. Government and municipal bonds	567	449
Corporate debt securities	0	0
Mortgage-backed securities	0	0
Other debt securities	0	0
Other Investments [Abstract]
Equity securities	34	13
Debt securities	82	36
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member] \| Current other assets [Member]
Assets [Abstract]
Restricted cash	60	85
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member]
Assets [Abstract]
Restricted cash	64
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	2,088	1,601
U.S. Government and municipal bonds	150	155
Corporate debt securities	748	728
Mortgage-backed securities	517	478
Other debt securities	117	145
Other Investments [Abstract]
Equity securities	12	11
Debt securities	69	90
Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	0	0
U.S. Government and municipal bonds	0	0
Corporate debt securities	0	0
Mortgage-backed securities	0	0
Other debt securities	0	1
Other Investments [Abstract]
Equity securities	0	0
Debt securities	0	0
Commodity contracts [Member] \| Fair Value, Recurring [Member]
Derivatives [Abstract]
Asset offsetting	2,700	2,811
Derivative Assets	2,350	1,840
Derivatives [Abstract]
Liability offsetting	2,625	2,622
Derivative Liabilities	576	683
Commodity contracts [Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1,229	1,379
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1,365	1,329
Commodity contracts [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	2,082	1,923
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1,446	1,410
Commodity contracts [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1,739	1,349
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	390	566
Interest Rate Contract [Member] \| Fair Value, Recurring [Member]
Derivatives [Abstract]
Asset offsetting	17	7
Derivative Assets	9	49
Derivatives [Abstract]
Liability offsetting	17	7
Derivative Liabilities	725	465
Interest Rate Contract [Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	0	0
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
Interest Rate Contract [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	24	56
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	598	336
Interest Rate Contract [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	2	0
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	144	136
Currency Swap [Member] \| Fair Value, Recurring [Member]
Derivatives [Abstract]
Asset offsetting	(1)	(13)
Derivative Assets	27	30
Derivatives [Abstract]
Liability offsetting	(1)	(13)
Derivative Liabilities	39	43
Currency Swap [Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	0	0
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
Currency Swap [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	26	17
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	38	30
Currency Swap [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	0	0
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
FPL[Member]
Derivatives [Abstract]
Derivative Assets	3	0
Derivatives [Abstract]
Derivative Liabilities	13	41
FPL[Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	156	206
Special use funds [Abstract]
Equity securities	2,491	1,850
U.S. Government and municipal bonds	535	470
Corporate debt securities	533	544
Mortgage-backed securities	395	367
Other debt securities	111	132
FPL[Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	156	206
Special use funds [Abstract]
Equity securities	596	398
U.S. Government and municipal bonds	429	350
Corporate debt securities	0	0
Mortgage-backed securities	0	0
Other debt securities	0	0
FPL[Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member] \| Current other assets [Member]
Assets [Abstract]
Restricted cash	54	81
FPL[Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member]
Assets [Abstract]
Restricted cash	64
FPL[Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	1,895	1,452
U.S. Government and municipal bonds	106	120
Corporate debt securities	533	544
Mortgage-backed securities	395	367
Other debt securities	111	131
FPL[Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	0	0
U.S. Government and municipal bonds	0	0
Corporate debt securities	0	0
Mortgage-backed securities	0	0
Other debt securities	0	1
FPL[Member] \| Commodity contracts [Member] \| Fair Value, Recurring [Member]
Derivatives [Abstract]
Asset offsetting	1	2
Derivative Assets	3	0
Derivatives [Abstract]
Liability offsetting	1	2
Derivative Liabilities	13	41
FPL[Member] \| Commodity contracts [Member] \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	0	0
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
FPL[Member] \| Commodity contracts [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	3	2
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	5	7
FPL[Member] \| Commodity contracts [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Fair Value, Recurring [Member]
Other Investments [Abstract]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1	0
Derivatives [Abstract]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ 9	$ 36

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