Restructuring Charges (Restructuring Liability) (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 189	$ 0	$ 206
Severance and Other Restructuring Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0	152	0	142
Restructuring Reserve [Roll Forward]
Accrued balance at beginning of period	66	59	53	66
Cash Payments	0	(120)	(30)	(137)
Other	0	25	(6)	(18)
Accrued balance at end of period	$ 66	$ 66	$ 17	$ 53