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Ratio of Tier 1 risk-based capital to total leverage exposure as defined by regulatory framework.

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Debt Obligations Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Long-term Line of Credit	$ 506.0		$ 506.0
Repayments of Long-term Debt			17,836.0	$ 20,293.0
Proceeds from Issuance of Long-term Debt			$ 11,839.0	$ 20,651.0
Banking Regulation, Supplementary Leverage Ratio, Actual	3.15		3.15
ETO Credit Facility due December 2022 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 4,370.0		$ 4,370.0
Long-term Line of Credit	599.0		599.0
Letters of Credit Outstanding, Amount	$ 31.0		$ 31.0
Line of Credit Facility, Interest Rate at Period End	0.43%		0.43%
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000.0		$ 5,000.0
Commercial Paper	590.0		590.0
ETO Credit Facility due December 2022 [Member] \| Accordion feature [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	6,000.0		6,000.0
ETO 364-day Credit Facility due November 2019 [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	0.0		0.0
Line of Credit Facility, Maximum Borrowing Capacity	1,000.0		1,000.0
Sunoco LP $1.5 billion Revolving Credit Facility due July 2023 [Member] \| Sunoco LP [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	1,500.0		1,500.0
Letters of Credit Outstanding, Amount	$ 6.0		$ 6.0
Line of Credit Facility, Interest Rate at Period End	2.09%		2.09%
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,240.0		$ 1,240.0
Line of Credit Facility, Fair Value, Basis for Measurement			250 million
ETO Term Loan [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	500.0	$ 1,500.0
Line of Credit Facility, Maximum Borrowing Capacity	2,000.0		$ 2,000.0
SemCAMS C$350 million senior secured term loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	276.0		276.0
Line of Credit Facility, Fair Value of Amount Outstanding	252.0		252.0
SemCAMS C$525 million senior secured revolving credit facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	414.0		414.0
SemCAMS C$300 million senior secured construction loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	237.0		237.0
Line of Credit Facility, Fair Value of Amount Outstanding	81.0		81.0
KAPS Facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	197.0		197.0
Line of Credit Facility, Fair Value of Amount Outstanding	$ 51.0		51.0
4.40% Senior Notes due April 2021 \| ETO [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt			$ 600.0
Debt Instrument, Interest Rate, Stated Percentage	4.40%		4.40%
4.65% Senior Notes due June 2021 \| ETO [Member]
Debt Instrument [Line Items]
Early Repayment of Senior Debt			$ 800.0
Debt Instrument, Interest Rate, Stated Percentage	4.65%		4.65%
USAC Credit Facility, due 2023 [Member] \| USAC [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 1,600.0		$ 1,600.0
Long-term Line of Credit	$ 1,090.0		$ 1,090.0
Line of Credit Facility, Interest Rate at Period End	2.96%		2.96%
Line of Credit Facility, Maximum Borrowing Capacity	$ 400.0		$ 400.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 114.0		114.0
4.50% senior notes due 2030
Debt Instrument [Line Items]
Early Repayment of Senior Debt			800.0
5.2% Senior Notes due 2022
Debt Instrument [Line Items]
Early Repayment of Senior Debt			$ 1,000.0
Debt Instrument, Interest Rate, Stated Percentage	5.20%		5.20%
5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Early Repayment of Senior Debt			$ 900.0
Debt Instrument, Interest Rate, Stated Percentage	5.875%		5.875%
4.5% senior notes due 2030
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	450.00%		450.00%
Canada, Dollars \| SemCAMS C$350 million senior secured term loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 350.0		$ 350.0
Line of Credit Facility, Fair Value of Amount Outstanding	320.0		320.0
Canada, Dollars \| SemCAMS C$525 million senior secured revolving credit facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	525.0		525.0
Canada, Dollars \| SemCAMS C$300 million senior secured construction loan facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	300.0		300.0
Line of Credit Facility, Fair Value of Amount Outstanding	103.0		103.0
Canada, Dollars \| KAPS Facility [Member] \| SemCAMS [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	250.0		250.0
Line of Credit Facility, Fair Value of Amount Outstanding	$ 65.0		$ 65.0