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Pension and Other Postretirement Benefits (Schedule of Defined Benefit Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Total assets in fair value hierarchy	$ 3,579	$ 3,612
Fair Value	722	739
Total investments at fair value	4,301	4,351
Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	187	184
Investment funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	269	291
Investment funds - emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	23	21
Investment funds - real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	57	54
Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	186	189
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	902	984
Level 1 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	98	172
Level 1 [Member] | Global large cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	14
Level 1 [Member] | U.S. large cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	66	69
Level 1 [Member] | Global mid/small cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	5
Level 1 [Member] | U.S. mid/small cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	262	249
Level 1 [Member] | Mutual funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	151	166
Level 1 [Member] | Mutual funds - U.S. equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	214	194
Level 1 [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	92	134
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2,101	1,986
Level 2 [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	498	472
Level 2 [Member] | Government issued debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	563	424
Level 2 [Member] | Corporate debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	136	157
Level 2 [Member] | Asset backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	13	19
Level 2 [Member] | Structured debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	695	697
Level 2 [Member] | Insurance contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	16	17
Level 2 [Member] | Derivatives [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	98	84
Level 2 [Member] | Investment funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	82	70
Level 2 [Member] | Investment funds - emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	46
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	576	642	$ 695
Level 3 [Member] | Investment funds - real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	132	116
Level 3 [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	207	225	252
Level 3 [Member] | Private equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	215	281	333
Level 3 [Member] | Real estate - direct [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	22	20
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	1,156	1,190	1,300
Total assets in fair value hierarchy	1,029	1,074
Fair Value	126	115
Total investments at fair value	1,155	1,189
Accrued income	1	1
U.S. Plans [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	77	69
U.S. Plans [Member] | Investment funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	26	25
U.S. Plans [Member] | Investment funds - emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	23	21
U.S. Plans [Member] | Investment funds - real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	0	0
U.S. Plans [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	0	0
U.S. Plans [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	768	825
U.S. Plans [Member] | Level 1 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	15	40
U.S. Plans [Member] | Level 1 [Member] | Global large cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0
U.S. Plans [Member] | Level 1 [Member] | U.S. large cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	60	62
U.S. Plans [Member] | Level 1 [Member] | Global mid/small cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0
U.S. Plans [Member] | Level 1 [Member] | U.S. mid/small cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	238	231
U.S. Plans [Member] | Level 1 [Member] | Mutual funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	149	164
U.S. Plans [Member] | Level 1 [Member] | Mutual funds - U.S. equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	214	194
U.S. Plans [Member] | Level 1 [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	92	134
U.S. Plans [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	137	131
U.S. Plans [Member] | Level 2 [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	2
U.S. Plans [Member] | Level 2 [Member] | Government issued debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	49	43
U.S. Plans [Member] | Level 2 [Member] | Corporate debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	75	71
U.S. Plans [Member] | Level 2 [Member] | Asset backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	11	15
U.S. Plans [Member] | Level 2 [Member] | Structured debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
U.S. Plans [Member] | Level 2 [Member] | Insurance contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
U.S. Plans [Member] | Level 2 [Member] | Derivatives [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
U.S. Plans [Member] | Level 2 [Member] | Investment funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
U.S. Plans [Member] | Level 2 [Member] | Investment funds - emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
U.S. Plans [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	124	118
U.S. Plans [Member] | Level 3 [Member] | Investment funds - real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	85	74
U.S. Plans [Member] | Level 3 [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	2
U.S. Plans [Member] | Level 3 [Member] | Private equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	22	26
U.S. Plans [Member] | Level 3 [Member] | Real estate - direct [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	17	16
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	3,152	3,169	$ 3,410
Total assets in fair value hierarchy	2,550	2,538
Fair Value	596	624
Total investments at fair value	3,146	3,162
Accrued income	6	7
Non-U.S. Plans [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	110	115
Non-U.S. Plans [Member] | Investment funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	243	266
Non-U.S. Plans [Member] | Investment funds - emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	0	0
Non-U.S. Plans [Member] | Investment funds - real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	57	54
Non-U.S. Plans [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value	186	189
Non-U.S. Plans [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	134	159
Non-U.S. Plans [Member] | Level 1 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	83	132
Non-U.S. Plans [Member] | Level 1 [Member] | Global large cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	14
Non-U.S. Plans [Member] | Level 1 [Member] | U.S. large cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	6	7
Non-U.S. Plans [Member] | Level 1 [Member] | Global mid/small cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	5
Non-U.S. Plans [Member] | Level 1 [Member] | U.S. mid/small cap equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	24	18
Non-U.S. Plans [Member] | Level 1 [Member] | Mutual funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	2
Non-U.S. Plans [Member] | Level 1 [Member] | Mutual funds - U.S. equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Non-U.S. Plans [Member] | Level 1 [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	0
Non-U.S. Plans [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	1,964	1,855
Non-U.S. Plans [Member] | Level 2 [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	496	470
Non-U.S. Plans [Member] | Level 2 [Member] | Government issued debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	514	381
Non-U.S. Plans [Member] | Level 2 [Member] | Corporate debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	61	86
Non-U.S. Plans [Member] | Level 2 [Member] | Asset backed securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	2	4
Non-U.S. Plans [Member] | Level 2 [Member] | Structured debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	695	697
Non-U.S. Plans [Member] | Level 2 [Member] | Insurance contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	16	17
Non-U.S. Plans [Member] | Level 2 [Member] | Derivatives [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	98	84
Non-U.S. Plans [Member] | Level 2 [Member] | Investment funds - global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	82	70
Non-U.S. Plans [Member] | Level 2 [Member] | Investment funds - emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	0	46
Non-U.S. Plans [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	452	524
Non-U.S. Plans [Member] | Level 3 [Member] | Investment funds - real estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	47	42
Non-U.S. Plans [Member] | Level 3 [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	207	223
Non-U.S. Plans [Member] | Level 3 [Member] | Private equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	193	255
Non-U.S. Plans [Member] | Level 3 [Member] | Real estate - direct [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets at fair value	$ 5	$ 4

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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