Customer Financing (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 311
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	127
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	68
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	13
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	284
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	553
Total financing receivables	1,356	$ 1,339
BBB Credit Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	108
Total financing receivables	108
BB Credit Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	235
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	120
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	42
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	13
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	126
Total financing receivables	536
B Credit Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	76
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	49
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	142
Total financing receivables	267
CCC Credit Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	235
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	177
Total financing receivables	$ 445