Segment Information - Assets, Investments, Equity, Capital Expenses and Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Total assets:	$ 8,882	$ 9,610	$ 9,699
Equity investments
Equity investments:	673	694	698
Equity earnings (losses):
Equity earnings (losses):	37	78	77
Capital expenditures:
Capital expenditures:	311	426	536
Depreciation and amortization expense:
Depreciation and amortization:	468	499	494
Reportable Segment Totals
Assets
Total assets:	8,434	9,085	9,153
Equity investments
Equity investments:	612	592	527
Equity earnings (losses):
Equity earnings (losses):	74	56	60
Capital expenditures:
Capital expenditures:	304	394	494
Depreciation and amortization expense:
Depreciation and amortization:	444	473	472
Americas
Assets
Total assets:	4,927	5,264	5,497
Equity investments
Equity investments:	492	491	429
Equity earnings (losses):
Equity earnings (losses):	51	38	39
Capital expenditures:
Capital expenditures:	146	178	255
Depreciation and amortization expense:
Depreciation and amortization:	270	292	293
Europe
Assets
Total assets:	3,507	3,127	3,036
Equity investments
Equity investments:	120	101	98
Equity earnings (losses):
Equity earnings (losses):	23	18	21
Capital expenditures:
Capital expenditures:	138	177	187
Depreciation and amortization expense:
Depreciation and amortization:	146	136	136
Asia Pacific
Assets
Total assets:		694	620
Capital expenditures:
Capital expenditures:	20	39	52
Depreciation and amortization expense:
Depreciation and amortization:	28	45	43
Other
Assets
Total assets:	448	525	546
Equity investments
Equity investments:	61	102	171
Equity earnings (losses):
Equity earnings (losses):	(37)	22	17
Capital expenditures:
Capital expenditures:	7	32	42
Depreciation and amortization expense:
Depreciation and amortization:	$ 24	$ 26	$ 22