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Accumulated Other Comprehensive Income - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period $ 7,730 $ 7,593 $ 7,912 $ 7,866
Other comprehensive income (loss) before reclassifications     (299) (114)
Amounts reclassified from AOCI     21 12
Net other comprehensive (loss) income 189 (4) (278) (102)
End of period 8,160 7,803 8,160 7,803
ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adoption of new accounting standard       (161)
CTA        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (2,954) (2,868)
Other comprehensive income (loss) before reclassifications     (170) (95)
Amounts reclassified from AOCI     0 0
Net other comprehensive (loss) income     (170) (95)
End of period (3,124) (2,954) (3,124) (2,954)
CTA | ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adoption of new accounting standard       9
Pension and OPEB Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (715) (954)
Other comprehensive income (loss) before reclassifications     2 7
Amounts reclassified from AOCI     24 13
Net other comprehensive (loss) income     26 20
End of period (689) (1,103) (689) (1,103)
Pension and OPEB Plans | ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adoption of new accounting standard       (169)
Hedging activities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (41) (1)
Other comprehensive income (loss) before reclassifications     (131) (26)
Amounts reclassified from AOCI     (3) (1)
Net other comprehensive (loss) income     (134) (27)
End of period (175) (29) (175) (29)
Hedging activities | ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Adoption of new accounting standard       (1)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (3,710) (3,823)
End of period $ (3,988) $ (4,086) $ (3,988) $ (4,086)