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Pension and Other Postretirement Benefits (Schedule of Defined Benefit Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	$ 360	$ 464	$ 533
Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	43	113
Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	51	75	103
Level 3 | Defined Benefit Plan, Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	307	346	317
Fair Value Measured at Net Asset Value Per Share | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	137	193
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	141	96
Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	109	328
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	7	23
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets excluding accrued income	4,659	4,604
Pension Plan | Total assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	4,265	3,964
Pension Plan | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	1,388	1,041
Pension Plan | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	655	213
Pension Plan | Level 1 | Global large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	9	7
Pension Plan | Level 1 | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	182	159
Pension Plan | Level 1 | U.S. mid/small cap equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	323	245
Pension Plan | Level 1 | Mutual funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	88	144
Pension Plan | Level 1 | Mutual funds – U.S. equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	56	206
Pension Plan | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	75	67
Pension Plan | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2,517	2,459
Pension Plan | Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	128	373
Pension Plan | Level 2 | Government issued debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	298	260
Pension Plan | Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	705	384
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	1,034	811
Pension Plan | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	115	105
Pension Plan | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	166	194
Pension Plan | Level 2 | Investment funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	69	297
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	360	464
Pension Plan | Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	43
Pension Plan | Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	51	75
Pension Plan | Level 3 | Defined Benefit Plan, Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	35	30
Pension Plan | Level 3 | Defined Benefit Plan, Equity Securities, US
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	272	316
Pension Plan | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	394	640
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	137	193
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	141	96
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	109	328
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	7	23
Pension Plan | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	1,152	1,131	1,012
Defined benefit plan fair value of plan assets excluding accrued income	1,151	1,130
Accrued income	1	1
Pension Plan | U.S. Plans | Total assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	1,032	987
Pension Plan | U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	855	813
Pension Plan | U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	157	23
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	178	155
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	301	218
Pension Plan | U.S. Plans | Level 1 | Mutual funds – global equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	88	144
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	56	206
Pension Plan | U.S. Plans | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	75	67
Pension Plan | U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	58	52
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	58	52
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 2 | Investment funds – emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value		0
Pension Plan | U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	119	122
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	5
Pension Plan | U.S. Plans | Level 3 | Defined Benefit Plan, Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	23	21
Pension Plan | U.S. Plans | Level 3 | Defined Benefit Plan, Equity Securities, US
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	91	96
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	119	143
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	112	102
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	0	18
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	7	23
Pension Plan | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	3,518	3,480	$ 3,264
Defined benefit plan fair value of plan assets excluding accrued income	3,508	3,474
Accrued income	10	6
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	3,233	2,977
Pension Plan | Non-U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	533	228
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	498	190
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	9	7
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	4
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	22	27
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	2,459	2,407
Pension Plan | Non-U.S. Plans | Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	128	373
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	298	260
Pension Plan | Non-U.S. Plans | Level 2 | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	647	332
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	1,034	811
Pension Plan | Non-U.S. Plans | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	115	105
Pension Plan | Non-U.S. Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	166	194
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	69	297
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	241	342
Pension Plan | Non-U.S. Plans | Level 3 | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	43
Pension Plan | Non-U.S. Plans | Level 3 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	46	70
Pension Plan | Non-U.S. Plans | Level 3 | Defined Benefit Plan, Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	12	9
Pension Plan | Non-U.S. Plans | Level 3 | Defined Benefit Plan, Equity Securities, US
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	181	220
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	275	497
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	25	91
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	141	78
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	109	328
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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