Defined Benefit

Cash Flow

Total

Pension and

Hedging

Accumulated

Cumulative

Postretirement

Instruments,

Other

Translation

Plans

Unrealized

Comprehensive

(Millions)

Adjustment

Adjustment

Gain (Loss)

Income (Loss)

Balance at December 31, 2015, net of tax:

$

(1,679)

$

(4,804)

$

124

$

(6,359)

Other comprehensive income (loss), before tax:

Amounts before reclassifications

(244)

(1,122)

57

(1,309)

Amounts reclassified out

 —

421

(109)

312

Total other comprehensive income (loss), before tax

(244)

(701)

(52)

(997)

Tax effect

(85)

177

19

111

Total other comprehensive income (loss), net of tax

(329)

(524)

(33)

(886)

Balance at December 31, 2016, net of tax:

$

(2,008)

$

(5,328)

$

91

$

(7,245)

Other comprehensive income (loss), before tax:

Amounts before reclassifications

91

(600)

(311)

(820)

Amounts reclassified out

 —

483

(7)

476

Total other comprehensive income (loss), before tax

91

(117)

(318)

(344)

Tax effect

279

169

115

563

Total other comprehensive income (loss), net of tax

370

52

(203)

219

Balance at December 31, 2017, net of tax:

$

(1,638)

$

(5,276)

$

(112)

$

(7,026)

Other comprehensive income (loss), before tax:

Amounts before reclassifications

(414)

55

133

(226)

Amounts reclassified out

 —

606

96

702

Total other comprehensive income (loss), before tax

(414)

661

229

476

Tax effect

(47)

(217)

(53)

(317)

Total other comprehensive income (loss), net of tax

(461)

444

176

159

Transfer of ownership involving non-wholly owned subsidiaries

 1

 —

 —

 1

Balance at December 31, 2018, net of tax:

$

(2,098)

$

(4,832)

$

64

$

(6,866)