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Pension and Other Postretirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Pre-Tax) in 2011) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year actuarial loss | $ 102 | $ 51 | $ 139
Total recognized in other comprehensive income (loss) (pre-tax) | 48 | $ 15 | $ 70
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year actuarial loss | (16) |  |
Actuarial (loss) recognized during the year | 0 |  |
Current year prior service cost (credit) | 4 |  |
Prior service credit (cost) recognized during the year | 0 |  |
Total recognized in other comprehensive income (loss) (pre-tax) | (12) |  |
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) | 10 |  |
United States Pension Benefits | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year actuarial loss | 118 |  |
Actuarial (loss) recognized during the year | (53) |  |
Current year prior service cost (credit) | 0 |  |
Prior service credit (cost) recognized during the year | 3 |  |
Total recognized in other comprehensive income (loss) (pre-tax) | 68 |  |
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) | 68 |  |
Foreign Pension Benefits | Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year actuarial loss | 0 |  |
Actuarial (loss) recognized during the year | (9) |  |
Current year prior service cost (credit) | 1 |  |
Prior service credit (cost) recognized during the year | 0 |  |
Total recognized in other comprehensive income (loss) (pre-tax) | (8) |  |
Total recognized in net periodic benefit costs and other comprehensive income (loss) (pre-tax) | $ (4) |  |

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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