Segment Information - Assets, Investments, Equity, Capital Expenses and Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Total assets:	$ 9,610	$ 9,699	$ 9,756
Equity investments
Equity investments:	694	698	525
Equity earnings:
Equity earnings	78	77	77
Capital expenditures:
Capital expenditures:	426	536	441
Depreciation and amortization expense:
Depreciation and amortization expense:	499	494	488
Reportable Segment Totals
Assets
Total assets:	9,403	9,451	9,545
Equity investments
Equity investments:	694	633	468
Equity earnings:
Equity earnings	58	60	59
Capital expenditures:
Capital expenditures:	421	534	440
Depreciation and amortization expense:
Depreciation and amortization expense:	488	484	478
Americas
Assets
Total assets:	5,264	5,497	5,411
Equity investments
Equity investments:	491	429	259
Equity earnings:
Equity earnings	38	39	41
Capital expenditures:
Capital expenditures:	178	255	233
Depreciation and amortization expense:
Depreciation and amortization expense:	292	293	310
Europe
Assets
Total assets:	3,127	3,036	3,133
Equity investments
Equity investments:	101	98	95
Equity earnings:
Equity earnings	18	21	18
Capital expenditures:
Capital expenditures:	177	187	152
Depreciation and amortization expense:
Depreciation and amortization expense:	136	136	125
Asia Pacific
Assets
Total assets:	1,012	918	1,001
Equity investments
Equity investments:	102	106	114
Equity earnings:
Equity earnings	2
Capital expenditures:
Capital expenditures:	66	92	55
Depreciation and amortization expense:
Depreciation and amortization expense:	60	55	43
Other
Assets
Total assets:	207	248	211
Equity investments
Equity investments:		65	57
Equity earnings:
Equity earnings	20	17	18
Capital expenditures:
Capital expenditures:	5	2	1
Depreciation and amortization expense:
Depreciation and amortization expense:	$ 11	$ 10	$ 10