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Pension and Other Postretirement Benefits (Schedule of Defined Benefit Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	$ 464	$ 533	$ 518
Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	43	113	189
Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	75	103	147
Fair Value Measured at Net Asset Value Per Share | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value		193	210
Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value		96	57
Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value		328	282
Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value		23	20
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income	4,604	4,270
Pension Plan | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	1,041	978
Pension Plan | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	213	259
Pension Plan | Level 1 | Global large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	7	27
Pension Plan | Level 1 | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	159	69
Pension Plan | Level 1 | U.S. mid/small cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	245	198
Pension Plan | Level 1 | Mutual funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	144	133
Pension Plan | Level 1 | Mutual funds – U.S. equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	206	188
Pension Plan | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	67	104
Pension Plan | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2,459	2,190
Pension Plan | Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	373	411
Pension Plan | Level 2 | Government issued debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	260	341
Pension Plan | Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	384	261
Pension Plan | Level 2 | Asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	2
Pension Plan | Level 2 | Structured debt
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	811	699
Pension Plan | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	105	105
Pension Plan | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	194	103
Pension Plan | Level 2 | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	297	268
Pension Plan | Level 2 | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	33
Pension Plan | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	464	533
Pension Plan | Level 3 | Investment funds – real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	316	290
Pension Plan | Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	43	113
Pension Plan | Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	75	103
Pension Plan | Level 3 | Real estate – direct
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	30	27
Pension Plan | Total assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	3,964	3,701
Pension Plan | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	640	569
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	193	210
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	96	57
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	328	282
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	23	20
Pension Plan | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value		1,012	1,220
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income	1,130	1,011
Accrued income	1	1
Pension Plan | U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	813	707
Pension Plan | U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	23	34
Pension Plan | U.S. Plans | Level 1 | Global large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 1 | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	155	66
Pension Plan | U.S. Plans | Level 1 | U.S. mid/small cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	218	182
Pension Plan | U.S. Plans | Level 1 | Mutual funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	144	133
Pension Plan | U.S. Plans | Level 1 | Mutual funds – U.S. equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	206	188
Pension Plan | U.S. Plans | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	67	104
Pension Plan | U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	52	49
Pension Plan | U.S. Plans | Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Government issued debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	52	49
Pension Plan | U.S. Plans | Level 2 | Asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Structured debt
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	122	123
Pension Plan | U.S. Plans | Level 3 | Investment funds – real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	96	94
Pension Plan | U.S. Plans | Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	5	9
Pension Plan | U.S. Plans | Level 3 | Real estate – direct
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	21	20
Pension Plan | U.S. Plans | Total assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	987	879
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	143	132
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	102	98
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	18	14
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	23	20
Pension Plan | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	3,480	3,264	$ 3,665
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income	3,474	3,259
Accrued income	6	5
Pension Plan | Non-U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	228	271
Pension Plan | Non-U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	190	225
Pension Plan | Non-U.S. Plans | Level 1 | Global large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	7	27
Pension Plan | Non-U.S. Plans | Level 1 | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	4	3
Pension Plan | Non-U.S. Plans | Level 1 | U.S. mid/small cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	27	16
Pension Plan | Non-U.S. Plans | Level 1 | Mutual funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 1 | Mutual funds – U.S. equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2,407	2,141
Pension Plan | Non-U.S. Plans | Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	373	411
Pension Plan | Non-U.S. Plans | Level 2 | Government issued debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	260	341
Pension Plan | Non-U.S. Plans | Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	332	212
Pension Plan | Non-U.S. Plans | Level 2 | Asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	2
Pension Plan | Non-U.S. Plans | Level 2 | Structured debt
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	811	699
Pension Plan | Non-U.S. Plans | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	105	105
Pension Plan | Non-U.S. Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	194	103
Pension Plan | Non-U.S. Plans | Level 2 | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	297	268
Pension Plan | Non-U.S. Plans | Level 2 | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	33
Pension Plan | Non-U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	342	410
Pension Plan | Non-U.S. Plans | Level 3 | Investment funds – real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	220	196
Pension Plan | Non-U.S. Plans | Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	43	113
Pension Plan | Non-U.S. Plans | Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	70	94
Pension Plan | Non-U.S. Plans | Level 3 | Real estate – direct
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	9	7
Pension Plan | Non-U.S. Plans | Total assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2,977	2,822
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	497	437
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	91	112
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	78	43
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	328	282
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	$ 0	$ 0

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