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Basis of Presentation and Accounting Policies (Change in Accounting Principle - Consolidated Statements of Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
 [1]
Sep. 30, 2020
 [1]
Jun. 30, 2020
 [1]
Mar. 31, 2020
 [1]
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income (loss) $ 228 $ 262 $ 328 $ 350 $ 221 $ 217 $ 118 $ (59) $ 1,168 $ 497 [2] $ 1,202 [2]
Provision (benefit) for deferred income taxes                 79 (82) 14
Net periodic defined benefit credit                 (81) (55) (35)
Previously Reported                      
Net income (loss)                   474 1,198
Provision (benefit) for deferred income taxes                   (89) 12
Net periodic defined benefit credit                   (25) (29)
Accounting change impact                      
Net income (loss)                 14 23 4
Provision (benefit) for deferred income taxes                 4 7 2
Net periodic defined benefit credit                 $ (18) $ (30) $ (6)
[1] Recast to reflect the retrospective application of the Corporation's election to change the accounting methodology for certain components of defined pension benefit credit. Refer to Note 1 for further information.
[2] See Defined Benefit Pension and Other Postretirement Costs in Note 1.