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Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amounts charged to expense for defined contribution plans |  | $ 93 | $ 85 | $ 82
Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 2.00% |  |
Below grade investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 8.00% |  |
Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, target allocation percentage |  | 55.00% |  |
Composition of plan assets |  | 57.00% |  |
Equity Securities [Member] | Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 3.00% |  |
Fixed Income Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, target allocation percentage |  | 45.00% |  |
Fixed Income Securities [Member] | Below grade investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 18.00% |  |
Corporate Bond Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 32.00% |  |
US Treasury And Foreign Government Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 8.00% |  |
All other Investments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Composition of plan assets |  | 3.00% |  |
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | $ 8,000 | 7,700 |
Voluntary employer contributions | $ 500 | 531 | 28 |
Pension [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution to its pension plans |  | 30 |  |
Pension [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution to its pension plans |  | 50 |  |
Pension [Member] | Change in Assumptions for Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
(Decrease) increase in pre-tax net periodic benefit cost |  | (70) | 60 |
Postretirement Benefit Plan [Member] | Change in Assumptions for Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
(Decrease) increase in pre-tax net periodic benefit cost |  | $ (20) | $ 10 |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Net increase or decrease in the plan benefit obligation during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of contributions made by the employer to defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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