Retirement Plans (Retirement Plans, Funded Status) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Expense for the defined contribution plans for continuing operations		$ 206	$ 193	$ 173
Foreign Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at end of period		1,100	951
Fair value of plan assets at end of period		1,002	832
Funded status at end of period		111	119
Defined Benefit Plan, Accumulated Benefit Obligation		1,000	878
Amounts recognized on the Consolidated Balance Sheets
Other Assets		85	39
Accrued employee compensation and benefits		7	8
Employee compensation and benefits		189	150
Pension plans in which projected benefit obligation exceeded plan assets
Projected benefit obligation		214	176
Fair value of plan assets		18	18
Pension plans in which accumulated benefit obligation exceeded plan assets
Accumulated benefit obligation		121	105
Fair value of plan assets		18	18
Foreign Plan [Member] | Cash and equivalents
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		151	12
Foreign Plan [Member] | Equity funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[1]	118	137
Foreign Plan [Member] | Bond funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[2]	391	324
Foreign Plan [Member] | Alternatives fund
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[3]	197	209
Foreign Plan [Member] | Real estate funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[4]	103	108
Foreign Plan [Member] | Other investments
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[5]	42	42
Foreign Plan [Member] | Level 1
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		6	6
Foreign Plan [Member] | Level 1 | Cash and equivalents
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		0	0
Foreign Plan [Member] | Level 1 | Equity funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[1]	0	0
Foreign Plan [Member] | Level 1 | Bond funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[2]	0	0
Foreign Plan [Member] | Level 1 | Alternatives fund
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[3]	0	0
Foreign Plan [Member] | Level 1 | Real estate funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[4]	0	0
Foreign Plan [Member] | Level 1 | Other investments
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[5]	6	6
Foreign Plan [Member] | Level 2
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		656	517
Foreign Plan [Member] | Level 2 | Cash and equivalents
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		151	12
Foreign Plan [Member] | Level 2 | Equity funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[1]	118	137
Foreign Plan [Member] | Level 2 | Bond funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[2]	292	267
Foreign Plan [Member] | Level 2 | Alternatives fund
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[3]	0	0
Foreign Plan [Member] | Level 2 | Real estate funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[4]	74	80
Foreign Plan [Member] | Level 2 | Other investments
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[5]	21	21
Foreign Plan [Member] | Level 3
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		15	36
Foreign Plan [Member] | Level 3 | Cash and equivalents
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period		0	0
Foreign Plan [Member] | Level 3 | Equity funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[1]	0	0
Foreign Plan [Member] | Level 3 | Bond funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[2]	0	21
Foreign Plan [Member] | Level 3 | Alternatives fund
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[3]	0	0
Foreign Plan [Member] | Level 3 | Real estate funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[4]	0	0
Foreign Plan [Member] | Level 3 | Other investments
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[5]	15	15
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[6]	325	273
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Cash and equivalents
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[6]	0	0
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Equity funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[1],[6]	0	0
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Bond funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[2],[6]	99	36
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Alternatives fund
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[3],[6]	197	209
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Real estate funds
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[4],[6]	29	28
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Other investments
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	[5],[6]	$ 0	$ 0
United Kingdom Pension Plan [Member]
Pension plans in which accumulated benefit obligation exceeded plan assets
United Kingdom pension plan percentage of international pension plans' projected benefit obligations		79.00%

[1] Strategy of equity funds is to invest in diversified funds of global common stocks.

[2] Strategy of bond funds is to invest in diversified funds of fixed income securities of varying geographies and credit quality.

[3] Strategy of alternative funds is to invest in a fund of diversifying investments, including but not limited to reinsurance, commodities and currencies.

[4] Strategy of real estate funds is to invest in diversified funds of real estate investment trusts and private real estate.

[5] Other investments primarily includes investments in insurance contracts.

[6] Represents investments measured at fair value using the Net Asset Value (NAV) per share practical expedient and thus has not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of our international pension plans assets.