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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6503844

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The amount of the cost recognized during the period for defined contribution plans.

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Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	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