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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Tax Credit Carryforward, Valuation Allowance						$ 111
Effective income tax rate reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	21.00%	21.00%	21.00%
State income tax, net of federal tax benefit (in hundredths)				1.00%	0.90%	0.80%
Statutory rate differential attributable to foreign operations (in hundredths)				(0.90%)	0.90%	(4.60%)
Effective Income Tax Rate Reconciliation Adjustments To Reserves And Prior Years				(1.70%)	2.30%	2.80%
Change in valuation allowance (in hundredths)				(2.50%)	(0.60%)	0.70%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Percent				(0.30%)	(16.60%)	0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent				(2.50%)	0.00%	(1.90%)
Other, net (in hundredths)				0.70%	1.40%	(0.20%)
Effective income tax rate (in hundredths)				11.40%	5.70%	16.20%
Share-based Payment Arrangement, Expense, Tax Benefit				$ (18)	$ (9)	$ (9)
Effective Income Tax Rate Reconciliation Share Based Compensation				(3.40%)	(3.60%)	(2.40%)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Effective income tax rate				$ 116	$ 79	$ 297
Details of income tax provision (benefit) [Abstract]
Current: Federal				37	129	102
Current: Foreign				121	166	181
Current: State				23	16	25
Total current income tax provision (benefit)				181	311	308
Deferred: Federal				(21)	(16)	(24)
Deferred: Foreign				(29)	(213)	5
Deferred: State				(15)	(3)	8
Deferred income taxes				65	232	11
Effective income tax rate				116	79	297
U.S. and foreign income before income taxes [Abstract]
U.S.				684	466	726
Foreign				336	907	1,113
Income from Continuing Operations Before Income Taxes				1,020	1,373	1,839
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount						35	$ 434
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				11	34
Employee Service Share-based Compensation, Deferred Tax Benefit from Compensation Expense				35	49	44
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				22
Limit on deductibility of interest expense							30.00%
Unrecognized Tax Benefits				175	188	113
Additions on tax positions related to the current year				5	84
Additions for tax positions of prior years				34	54
Unrecognized Tax Benefits that Would Impact Effective Tax Rate				132
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount						20
Deferred Tax Assets, Gross				1,636	1,505
Deferred Tax Assets, Net				553	447
Income Tax Examination, Penalties and Interest Expense				2	13	2
Income Tax Examination, Penalties and Interest Accrued				1	26
Reductions for tax positions of prior years				(22)	(30)
Reductions for settlements				(30)	(31)
Reductions due to statute expiration				0	(2)
Foreign currency translation adjustment				0	0
Deferred Tax Assets, Valuation Allowance				(789)	(787)	(454)
Deferred Tax Assets, Increases [Member]
U.S. and foreign income before income taxes [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				(64)	(384)
Deferred Tax Assets, Decreases
U.S. and foreign income before income taxes [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				45	57
Deferred Tax Assets, Other Adjustments
U.S. and foreign income before income taxes [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				17	(6)
UNITED KINGDOM
U.S. and foreign income before income taxes [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount					366
Deferred Tax Assets, Gross					586
Non-UK [Member]
U.S. and foreign income before income taxes [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount					7
Deferred Tax Assets, Gross					13
Deferred Tax Assets, Net					6
Tax Year 2018 [Member]
U.S. and foreign income before income taxes [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount						399
Tax Year 2017 [Member]
Effective income tax rate reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent							35.00%
Tax Year 2020 [Member]
U.S. and foreign income before income taxes [Abstract]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount				6
State and Local Jurisdiction [Member] | Indefinite
Valuation Allowance [Line Items]
Tax Credit Carryforward, Valuation Allowance				15
U.S. and foreign income before income taxes [Abstract]
Tax Credit Carryforward, Amount				361
State and Local Jurisdiction [Member] | 2023
Valuation Allowance [Line Items]
Tax Credit Carryforward, Valuation Allowance				5
U.S. and foreign income before income taxes [Abstract]
Tax Credit Carryforward, Amount				$ 8
Foreign [Member]
Effective income tax rate reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	19.00%	17.00%	17.00%	19.00%
Foreign [Member] | Indefinite
Valuation Allowance [Line Items]
Tax Credit Carryforward, Valuation Allowance				$ 3
U.S. and foreign income before income taxes [Abstract]
Tax Credit Carryforward, Amount				14
Foreign [Member] | 2023 - 2030
Valuation Allowance [Line Items]
Tax Credit Carryforward, Valuation Allowance				220
U.S. and foreign income before income taxes [Abstract]
Tax Credit Carryforward, Amount				$ 220
Prior Year Divestiture [Member]
U.S. and foreign income before income taxes [Abstract]
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount						$ 19
Deferred Compensation, Share-based Payments [Member]
U.S. and foreign income before income taxes [Abstract]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount					$ 18

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