(Activity Between Company And Entities) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Two Thousand And Fifteen Financing Entities [Member]
Variable Interest Entity [Line Items]
Revenue	[1]	$ 95	$ 95	$ 95
Expense	[1]	122	128	128
Cash receipts	[2]	95	95	95
Cash payments	[3]	157	128	128
Two Thousand And Seven Financing Entities [Member]
Variable Interest Entity [Line Items]
Revenue	[4]	41	79	72
Expense	[5]	43	76	67
Cash receipts	[6]	29	62	48
Cash payments	[7]	$ 40	$ 69	$ 57

[1] The revenue and expense are included in Interest expense, net in the accompanying consolidated statement of operations.

[2] The cash receipts are interest received on the Financial assets of variable interest entities.

[3] The cash payments represent interest paid on Current nonrecourse financial liabilities of variable interest entities.

[4] The revenue is included in Interest expense, net, in the accompanying consolidated statement of operations and includes approximately $19 million for the years ended December 31, 2020, 2019 and 2018, respectively, of accretion income for the amortization of the purchase accounting adjustment on the Financial assets of variable interest entities.

[5] The expense is included in Interest expense, net, in the accompanying consolidated statement of operations and includes approximately $7 million for the years ended December 31, 2020, 2019 and 2018 respectively, of accretion expense for the amortization of the purchase accounting adjustment on the Long-term nonrecourse financial liabilities of variable interest entities.

[6] The cash receipts are interest received on the Financial assets of special purpose entities.

[7] The cash payments are interest paid on Nonrecourse financial liabilities of special purpose entities.