Customer Financing (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	266
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	125
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	66
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	13
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	817
Carrying value of financing receivables	1,296	$ 1,356
BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	98
Carrying value of financing receivables	98
BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	231
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	118
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	42
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	13
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	121
Carrying value of financing receivables	534
B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	35
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	188
Carrying value of financing receivables	223
CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	24
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	410
Carrying value of financing receivables	$ 441