Debt (Letter of Credit) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		$ 1,076	$ 1,085
Revolving facilities
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	[1]	462	604
CDHI
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	[2]	3	3
Various project financing facilities(2)
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	[3]	336	184
Other corporate facilities
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	[4]	$ 275	$ 294

[1] The Corporate Revolving Facility represents our primary revolving facility and matures on March 8, 2023.

[2] On April 9, 2020, we amended one of our unsecured letter of credit facilities to partially extend the maturity of $100 million in commitments from June 20, 2020 to June 20, 2022.

[3] On June 9, 2020, we entered into the GPC Term Loan which provides for $200 million in letter of credit facilities.

[4] (2)On January 21, 2020, we redeemed the outstanding $184 million in aggregate principal amount of our 2024 First Lien Notes, which was included in debt, current portion on our Consolidated Condensed Balance Sheet at December 31, 2019, with the proceeds from the 2028 First Lien Notes, which was included in cash and cash equivalents on our Consolidated Condensed Balance Sheet at December 31, 2019.