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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Changes in AOCI by Component
Changes in AOCI by component are as follows:
DerivativesInvestmentsEmployee
Benefit
Plans		Cumulative
Translation
Adjustment		Accumulated Other
Comprehensive
Income (Loss)
Balance January 1, 2018, net of taxes
$(108)$(61)$(2,787)$(1,954)$(4,910)
Other comprehensive income (loss) before reclassification adjustments, pretax228 (108)(728)(84)(692)
Tax(55)1 169 (139)(24)
Other comprehensive income (loss) before reclassification adjustments, net of taxes173 (107)(559)(223)(716)
Reclassification adjustments, pretax157 
(1)
97 
(2)
170 
(3)
— 424 
Tax(33)— (36)— (69)
Reclassification adjustments, net of taxes124 97 134 — 355 
Other comprehensive income (loss), net of taxes297 (10)(425)(223)(361)
Adoption of ASU 2018-02(23)1 (344)100 (266)
Adoption of ASU 2016-01— (8)— — (8)
Balance at December 31, 2018, net of taxes166 (78)(3,556)(2,077)(5,545)
Other comprehensive income (loss) before reclassification adjustments, pretax86 140 (948)112 (610)
Tax(15)— 192 (16)161 
Other comprehensive income (loss) before reclassification adjustments, net of taxes71 140 (756)96 (449)
Reclassification adjustments, pretax(261)
(1)
(44)
(2)
66 
(3)
— (239)
Tax55 — (15)— 40 
Reclassification adjustments, net of taxes(206)(44)51 — (199)
Other comprehensive income (loss), net of taxes(135)96 (705)96 (648)
Balance at December 31, 2019, net of taxes31 18 (4,261)
(4)
(1,981)(6,193)
Other comprehensive income (loss) before reclassification adjustments, pretax(383)3 (599)64 (915)
Tax84 — 111 89 284 
Other comprehensive income (loss) before reclassification adjustments, net of taxes(299)3 (488)153 (631)
Reclassification adjustments, pretax2 
(1)
(21)
(2)
272 
(3)
— 253 
Tax— — (63)— (63)
Reclassification adjustments, net of taxes2 (21)209 — 190 
Other comprehensive income (loss), net of taxes(297)(18)(279)153 (441)
Balance at December 31, 2020, net of taxes$(266)$— $(4,540)
(4)
$(1,828)$(6,634)
(1)Relates to foreign currency cash flow hedges that were reclassified from AOCI to Sales.
(2)    Represents net realized (gains) losses on the sales of available-for-sale investments that were reclassified from AOCI to Other (income) expense, net.
(3)    Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 13).
(4)    Includes pension plan net loss of $5.4 billion and $5.1 billion at December 31, 2020 and 2019, respectively, and other postretirement benefit plan net gain of $391 million and $247 million at December 31, 2020 and 2019, respectively, as well as pension plan prior service credit of $255 million and $263 million at December 31, 2020 and 2019, respectively, and other postretirement benefit plan prior service credit of $244 million and $305 million at December 31, 2020 and 2019, respectively.