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Pension And Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2017
Pension And Postretirement Benefits  
Schedule Of Plan Obligations In Excess Of Plan Assets [Table Text Block]
Pension BenefitsPostretirement Benefits
2017201620172016
Benefit obligation at beginning of year$56,183$55,464$26,027$27,898
Service cost - benefits earned during the period1,1281,112138192
Interest cost on projected benefit obligation1,9361,980809972
Amendments48(206)(1,807)(600)
Actuarial (gain) loss3,6961,485630(529)
Special termination benefits3-1-
Benefits paid(3,705)(3,614)(1,739)(1,941)
Plan transfers5(38)-35
Benefit obligation at end of year$59,294$56,183$24,059$26,027

Pension BenefitsPostretirement Benefits
2017201620172016
Fair value of plan assets at beginning of year$42,610$42,195$5,921$6,671
Actual return on plan assets5,9873,123607407
Benefits paid1(3,705)(3,614)(1,055)(1,156)
Contributions566910500-
Plan transfers and other5(4)-(1)
Fair value of plan assets at end of year345,46342,6105,9735,921
Unfunded status at end of year2$(13,831)$(13,573)$(18,086)$(20,106)
1 At our discretion, certain postretirement benefits may be paid from AT&T cash accounts, which does not reduce
Voluntary Employee Benefit Association (VEBA) assets. Future benefit payments may be made from VEBA trusts and
thus reduce those asset balances.
2 Funded status is not indicative of our ability to pay ongoing pension benefits or of our obligation to fund retirement trusts.
Required pension funding is determined in accordance with the Employee Retirement Income Security Act of 1974, as
amended (ERISA) and applicable regulations.
3  Net assets available for pension benefits were $54,618 at December 31, 2017 and $51,087 at December 31, 2016 and include the
preferred equity interest in AT&T Mobility II LLC discussed below, which was valued at $9,155 and $8,477, respectively.

Pension BenefitsPostretirement Benefits
2017201620172016
Current portion of employee benefit obligation1$-$-$(1,585)$(1,644)
Employee benefit obligation2(13,831)(13,573)(16,501)(18,462)
Net amount recognized$(13,831)$(13,573)$(18,086)$(20,106)
1 Included in "Accounts payable and accrued liabilities."
2 Included in "Postemployment benefit obligation."
Schedule Of Defined Benefit Plan And Postretirement Benefits Disclosure [Table Text Block]
2017 2016
Plan assets recognized in the consolidated financial statements$45,463 $ 42,610
Preferred equity interest in Mobility 9,155 8,477
Net assets available for benefits $54,618 $ 51,087

Pension BenefitsPostretirement Benefits
201720162015201720162015
Service cost – benefits earned during the period$1,128$1,112$1,212$138$192$222
Interest cost on projected benefit obligation1,9361,9801,902809972967
Expected return on assets(3,134)(3,115)(3,317)(319)(355)(421)
Amortization of prior service credit (123)(103)(103)(1,466)(1,277)(1,278)
Actuarial (gain) loss8441,478(373)342(581)(1,632)
Net pension and postretirement cost (credit)$651$1,352$(679)$(496)$(1,049)$(2,142)

Pension BenefitsPostretirement Benefits
201720162015201720162015
Balance at beginning of year$575$512$575$5,089$5,510$6,257
Prior service (cost) credit(30)12811,12037245
Amortization of prior service credit(76)(65)(64)(907)(793)(792)
Total recognized in other comprehensive (income) loss(106)63(63)213(421)(747)
Balance at end of year$469$575$512$5,302$5,089$5,510

Net Periodic Benefit Cost201720162015
Service cost – benefits earned during the period$13$12$9
Interest cost on projected benefit obligation778377
Amortization of prior service cost (credit)(1)(1)1
Actuarial (gain) loss12672(36)
Net supplemental retirement pension cost$215$166$51
Other Changes Recognized in Other Comprehensive Income201720162015
Prior service (cost) credit$1$1$(1)
Amortization of prior service cost (credit)(1)(1)1
Total recognized in other comprehensive (income) loss (net of tax)$-$-$-
Schedule Of Assumptions In Determining The Projected Benefit Obligation And Net Pension And Postretirement Benefit Cost [Table Text Block]
Pension BenefitsPostretirement Benefits
201720162015201720162015
Weighted-average discount rate for determining benefit obligation at December 313.80%4.40%4.60%3.70%4.30%4.50%
Discount rate in effect for determining service cost14.60%4.90%4.60%4.60%5.00%4.60%
Discount rate in effect for determining interest cost13.60%3.70%3.30%3.40%3.60%3.30%
Long-term rate of return on plan assets7.75%7.75%7.75%5.75%5.75%5.75%
Composite rate of compensation increase for determining benefit obligation3.00%3.00%3.10%3.00%3.00%3.10%
Composite rate of compensation increase for determining net cost (benefit)3.00%3.10%3.00%3.00%3.10%3.00%
1Weighted -average discount rate in effect from January 1, 2017 through April 30, 2017 was 4.70% for service costs and
3.50% for interest costs, and, from May 1, 2017 through December 31, 2017 was 4.50% for service cost and 3.30% for
interest cost.
The Effect Of A One Percentage-Point Change In The Assumed Combined Medical And Dental Cost Trend Rate [Table Text Block]
One Percentage-One Percentage-
Point IncreasePoint Decrease
Increase (decrease) in total of service and interest cost components$34$(30)
Increase (decrease) in accumulated postretirement benefit obligation401(360)
Schedule Of Defined Benefit Plan Targeted And Actual Plan Asset Allocations [Table Text Block]
Pension AssetsPostretirement (VEBA) Assets
Target20172016Target20172016
Equity securities:
Domestic20%-30%23%24%13%-23%18%22%
International10%-20%161510%-20%1519
Fixed income securities35%-45%413935%-45%4038
Real assets6%-16%10110%-6%11
Private equity4%-14%10110%-7%22
Other0%-5%--20%-30%2418
Total100%100%100%100%
Schedule Of Fair Value Of Pension And Postretirement Assets And Liabilities By Level [Table Text Block]
Pension Assets and Liabilities at Fair Value as of December 31, 2017
Level 1Level 2Level 3Total
Non-interest bearing cash$96$-$-$96
Interest bearing cash720-27
Foreign currency contracts-2-2
Equity securities:
Domestic equities9,441-49,445
International equities4,9671-4,968
Fixed income securities:
Asset-backed securities-479-479
Mortgage-backed securities-765-765
Commercial mortgage-backed securities-170-170
Collateralized mortgage obligations/REMICS-284-284
Corporate and other fixed income instruments and funds489,72029,770
Government and municipal bonds-5,618-5,618
Real estate and real assets--2,2872,287
Securities lending collateral82,240-2,248
Receivable for variation margin6--6
Assets at fair value14,57319,2992,29336,165
Investments sold short and other liabilities at fair value(497)(4)-(501)
Total plan net assets at fair value$14,076$19,295$2,293$35,664
Assets held at net asset value practical expedient
Private equity funds4,493
Real estate funds2,340
Commingled funds5,142
Total assets held at net asset value practical expedient11,975
Other assets (liabilities)1(2,176)
Total Plan Net Assets$45,463
1 Other assets (liabilities) include amounts receivable, accounts payable and net adjustment for securities lending payable.

Postretirement Assets and Liabilities at Fair Value as of December 31, 2017
Level 1Level 2Level 3Total
Interest bearing cash$603$725$-$1,328
Foreign currencies8--8
Equity securities:
Domestic equities8579-866
International equities600--600
Fixed income securities:
Asset-backed securities-39241
Commercial mortgage-backed securities-53255
Mortgage backed securities-271-271
Collateralized mortgage obligations-91192
Corporate and other fixed income instruments and funds-456-456
Government and municipal bonds-439-439
Securities lending collateral-120-120
Total plan net assets at fair value$2,068$2,203$5$4,276
Assets held at net asset value practical expedient
Private equity funds102
Real estate funds41
Commingled funds1,750
Total assets held at net asset value practical expedient1,893
Other assets (liabilities)1(196)
Total Plan Net Assets$5,973
1 Other assets (liabilities) include amounts receivable, accounts payable and net adjustment for securities lending payable.

Pension Assets and Liabilities at Fair Value as of December 31, 2016
Level 1Level 2Level 3Total
Non-interest bearing cash$94$-$-$94
Interest bearing cash-77-77
Foreign currency contracts-7-7
Equity securities:
Domestic equities8,299--8,299
International equities4,389-54,394
Fixed income securities:
Asset-backed securities-399-399
Mortgage-backed securities-838-838
Commercial mortgage-backed securities-208-208
Collateralized mortgage obligations/REMICS-269-269
Corporate and other fixed income instruments and funds758,442408,557
Government and municipal bonds804,889-4,969
Real estate and real assets--2,2732,273
Securities lending collateral2071,977-2,184
Receivable for variation margin8--8
Purchased options-1-1
Assets at fair value13,15217,1072,31832,577
Investments sold short and other liabilities at fair value(643)(7)(4)(654)
Total plan net assets at fair value$12,509$17,100$2,314$31,923
Assets held at net asset value practical expedient
Private equity funds4,648
Real estate funds2,392
Commingled funds5,721
Total assets held at net asset value practical expedient12,761
Other assets (liabilities)1(2,074)
Total Plan Net Assets$42,610
1 Other assets (liabilities) include amounts receivable, accounts payable and net adjustment for securities lending payable.

Postretirement Assets and Liabilities at Fair Value as of December 31, 2016
Level 1Level 2Level 3Total
Interest bearing cash$175$593$-$768
Foreign currencies6--6
Equity securities:
Domestic equities1,2409-1,249
International equities834--834
Fixed income securities:
Asset-backed securities-33437
Commercial mortgage-backed securities-10813121
Mortgage-backed securities-193-193
Collateralized mortgage obligations-32234
Corporate and other fixed income instruments and funds-4227429
Government and municipal bonds20466-486
Securities lending collateral-128-128
Total plan net assets at fair value$2,275$1,984$26$4,285
Assets held at net asset value practical expedient
Private equity funds118
Real estate funds61
Commingled funds1,667
Total assets held at net asset value practical expedient1,846
Other assets (liabilities)1(210)
Total Plan Net Assets$5,921
1 Other assets (liabilities) include amounts receivable, accounts payable and net adjustment for securities lending payable.
Summary of Changes In The Fair Value Of The Level 3 Pension And Postretirement Assets [Table Text Block]
Pension AssetsEquitiesFixed Income FundsReal Estate and Real AssetsTotal
Balance at beginning of year$1$40$2,273$2,314
Realized gains (losses)1-(73)(72)
Unrealized gains (losses)(2)1216215
Transfers in--2525
Transfers out-(32)-(32)
Purchases5-157162
Sales(1)(7)(311)(319)
Balance at end of year$4$2$2,287$2,293

Postretirement AssetsFixed Income FundsTotal
Balance at beginning of year$26$26
Transfers out(15)(15)
Purchases22
Sales(8)(8)
Balance at end of year$5$5

Pension AssetsEquitiesFixed Income FundsReal Estate and Real AssetsTotal
Balance at beginning of year$-$44$2,062$2,106
Realized gains (losses)-(17)(103)(120)
Unrealized gains (losses)319377399
Transfers in(4)-7773
Transfers out-(2)-(2)
Purchases3-6568
Sales(1)(4)(205)(210)
Balance at end of year$1$40$2,273$2,314

Postretirement AssetsFixed Income FundsTotal
Balance at beginning of year$15$15
Realized gains (losses)(2)(2)
Unrealized gains (losses)22
Transfers in1616
Sales(5)(5)
Balance at end of year$26$26
Estimated Future Benefit Payments [Table Text Block]
Pension BenefitsPostretirement Benefits
2018$4,633$1,751
20194,1911,719
20204,1801,707
20214,1491,692
20224,0631,670
Years 2023 - 202719,6537,267

20172016
Projected benefit obligation$(2,344)$(2,378)
Accumulated benefit obligation(2,285)(2,314)
Fair value of plan assets--