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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of defined benefit plans disclosures Benefit Obligations, Fair Value of Plan Assets and Funded Status
 
Pension Benefits
 
Other Postretirement and Postemployment Benefits
 
December 31,
 
December 31,
(in millions)
2016
2015
 
2016
2015
Benefit obligation at beginning of period
$
20,611

$
21,856

 
$
3,336

$
3,487

Service cost
—

—

 
68

62

Interest cost
917

884

 
147

141

Actuarial loss (gain)
411

(1,061
)
 
115

(88
)
Benefits paid, including lump sums and annuities
(1,071
)
(1,059
)
 
(318
)
(302
)
Participant contributions
—

—

 
31

36

Settlements
(9
)
(9
)
 
—

—

Benefit obligation at end of period(1)
$
20,859

$
20,611

 
$
3,379

$
3,336

 
 
 
 
 
 
Fair value of plan assets at beginning of period
$
9,374

$
9,355

 
$
884

$
982

Actual gain (loss) on plan assets
687

(132
)
 
51

(25
)
Employer contributions
1,320

1,219

 
154

210

Participant contributions
—

—

 
31

36

Benefits paid, including lump sums and annuities
(1,071
)
(1,059
)
 
(336
)
(319
)
Settlements
(9
)
(9
)
 
—

—

Fair value of plan assets at end of period
$
10,301

$
9,374


$
784

$
884

 
 
 
 
 
 
Funded status at end of period
$
(10,558
)
$
(11,237
)
 
$
(2,595
)
$
(2,452
)

(1) 
At the end of each year presented, our accumulated benefit obligations for our pension plans are equal to the benefit obligations shown above.
Schedule of amounts recognized in balance sheet Balance Sheet Position
 
Pension Benefits
 
Other Postretirement and Postemployment Benefits
 
December 31,
 
December 31,
(in millions)
2016
2015
 
2016
2015
Current liabilities
$
(30
)
$
(27
)
 
$
(125
)
$
(139
)
Noncurrent liabilities
(10,528
)
(11,210
)
 
(2,470
)
(2,313
)
Total liabilities
$
(10,558
)
$
(11,237
)
 
$
(2,595
)
$
(2,452
)
 
 
 
 
 
 
Net actuarial loss
$
(8,515
)
$
(8,124
)
 
$
(570
)
$
(458
)
Prior service credit
—

—

 
82

109

Total accumulated other comprehensive loss, pre-tax
$
(8,515
)
$
(8,124
)
 
$
(488
)
$
(349
)
Schedule of net benefit costs Net Periodic Cost
 
Pension Benefits
 
Other Postretirement and
Postemployment Benefits
 
Year Ended December 31,
 
Year Ended December 31,
(in millions)
2016
2015
2014
 
2016
2015
2014
Service cost
$
—

$
—

$
—

 
$
68

$
62

$
52

Interest cost
917

884

928

 
147

141

155

Expected return on plan assets
(902
)
(879
)
(829
)
 
(74
)
(81
)
(84
)
Amortization of prior service credit
—

—

—

 
(26
)
(26
)
(26
)
Recognized net actuarial loss
233

232

134

 
24

24

4

Settlements
3

3

—

 
—

—

—

Net periodic cost
$
251

$
240

$
233

 
$
139

$
120

$
101

Defined contribution plan costs
733

592

551

 
—

—

—

Total cost
$
984

$
832

$
784

 
$
139

$
120

$
101
Schedule of assumptions used We used the following actuarial assumptions to determine our benefit obligations and our net periodic cost for the periods presented:
 
December 31,
Benefit Obligations(1)(2)
2016
2015
Weighted average discount rate
4.20
%
4.57
%
 
Year Ended December 31,
Net Periodic Cost(2)
2016
2015
2014
Weighted average discount rate - pension benefit
4.57
%
4.13
%
4.99
%
Weighted average discount rate - other postretirement benefit(3)
4.53
%
4.13
%
4.88
%
Weighted average discount rate - other postemployment benefit
4.50
%
4.13
%
5.00
%
Weighted average expected long-term rate of return on plan assets
8.94
%
8.94
%
8.94
%
Assumed healthcare cost trend rate(4)
6.50
%
7.00
%
7.00
%
 
(1) 
Our 2016 and 2015 benefit obligations are measured using a mortality table projected to 2022.
(2) 
Future compensation levels do not impact our frozen defined benefit pension plans or other postretirement plans and impact only a small portion of our other postemployment liability.
(3) 
Our assumptions reflect various remeasurements of certain portions of our obligations and represent the weighted average of the assumptions used for each measurement date.
(4) 
Assumed healthcare cost trend rate at December 31, 2016 is assumed to decline gradually to 5.00% by 2023 and remain level thereafter.
Schedule of effect of one-percentage-point change in assumed health care cost trend rates A 1% change in the healthcare cost trend rate used in measuring the accumulated plan benefit obligation for these plans, which provide benefits to eligible retirees and their dependents who are under age 65, at December 31, 2016, would have the following effects:
(in millions)
1% Increase
1% Decrease
Increase (decrease) in total service and interest cost
$
1

$
(1
)
Increase (decrease) in the accumulated plan benefit obligation
12

(29
)
Schedule of expected benefit payments The following table summarizes the benefit payments that are scheduled to be paid in the years ending December 31:
(in millions)
Pension Benefits
Other Postretirement and Postemployment Benefits
2017
$
1,154

$
281

2018
1,163

286

2019
1,184

284

2020
1,206

285

2021
1,224

287

2022-2026
6,326

1,443
Fair value, assets measured on recurring basis The following table summarizes investments measured at fair value based on NAV per share as a practical expedient:
 
December 31, 2016
 
December 31, 2015
(in millions)
Fair Value
Redemption Frequency
Redemption Notice Period
Unfunded Commitments
 
Fair Value
Redemption Frequency
Redemption Notice Period
Unfunded Commitments
Hedge funds
$
3,308

(5)
4-120 Days
$
—

 
$
2,990

(5)
5-120 Days
$
—

Commingled funds, private equities and equity-related instruments
1,214

(1) (3) (4)
15-30 Days
525

 
1,133

(1) (3) (4)
15-30 Days
345

Fixed income and fixed income-related instruments
270

(2)
5 Days
—

 
268

(2)
5 Days
5

Real assets
698

(3) (4)
N/A
529

 
635

(3) (4)
N/A
188

Other
234

(2)
2 Days
—

 
338

(1) (2)
2-270 Days
—

Total investments measured at NAV
$
5,724



$
1,054

 
$
5,364



$
538

(1) 
Monthly
(2) 
Semi-monthly
(3) 
Semi-annually
(4) 
Annually
(5) 
Various. Includes funds with weekly, monthly, semi-monthly, quarterly and custom redemption frequencies as well as funds with a redemption window following the anniversary of the initial investment.

The following table shows our benefit plan assets by asset class.
 
December 31, 2016
 
December 31, 2015
 
Valuation Technique
(in millions)
Level 1
Level 2
Total
 
Level 1
Level 2
Total
 
Equities and equity-related instruments
$
2,407

$
14

$
2,421

 
$
2,067

$
49

$
2,116

 
(a)
Cash equivalents
228

1,240

1,468

 
—

1,700

1,700

 
(a)
Fixed income and fixed income-related instruments
8

1,190

1,198

 
16

834

850

 
(a)(b)
Benefit plan assets
$
2,643

$
2,444

$
5,087

 
$
2,083

$
2,583

$
4,666

 
 
 
 
 
 
 
 
 
 
 
 
Investments measured at net asset value ("NAV")(1)
 
 
$
5,724

 
 
 
$
5,364

 
 
Total benefit plan assets
 
 
$
10,811

 
 
 
$
10,030

 
 

(1) 
Investments that were measured at NAV per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy.